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SPIRV-Tools/source/opt/folding_rules.cpp
Steven Perron 9e7a1f2ddd
Fix array size calculation (#5463) 
The function that get the number of elements in a composite variable
returns an incorrect values for the arrays. This is fixed, so that it
returns the correct number of elements for arrays where the number of
elements is represented as a 32-bit integer and is known at compile
time.

Fixes #4953
2023-11-02 13:29:57 -04:00

3045 lines
113 KiB
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// Copyright (c) 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "source/opt/folding_rules.h"
#include <limits>
#include <memory>
#include <utility>
#include "ir_builder.h"
#include "source/latest_version_glsl_std_450_header.h"
#include "source/opt/ir_context.h"
namespace spvtools {
namespace opt {
namespace {
constexpr uint32_t kExtractCompositeIdInIdx = 0;
constexpr uint32_t kInsertObjectIdInIdx = 0;
constexpr uint32_t kInsertCompositeIdInIdx = 1;
constexpr uint32_t kExtInstSetIdInIdx = 0;
constexpr uint32_t kExtInstInstructionInIdx = 1;
constexpr uint32_t kFMixXIdInIdx = 2;
constexpr uint32_t kFMixYIdInIdx = 3;
constexpr uint32_t kFMixAIdInIdx = 4;
constexpr uint32_t kStoreObjectInIdx = 1;
// Some image instructions may contain an "image operands" argument.
// Returns the operand index for the "image operands".
// Returns -1 if the instruction does not have image operands.
int32_t ImageOperandsMaskInOperandIndex(Instruction* inst) {
const auto opcode = inst->opcode();
switch (opcode) {
case spv::Op::OpImageSampleImplicitLod:
case spv::Op::OpImageSampleExplicitLod:
case spv::Op::OpImageSampleProjImplicitLod:
case spv::Op::OpImageSampleProjExplicitLod:
case spv::Op::OpImageFetch:
case spv::Op::OpImageRead:
case spv::Op::OpImageSparseSampleImplicitLod:
case spv::Op::OpImageSparseSampleExplicitLod:
case spv::Op::OpImageSparseSampleProjImplicitLod:
case spv::Op::OpImageSparseSampleProjExplicitLod:
case spv::Op::OpImageSparseFetch:
case spv::Op::OpImageSparseRead:
return inst->NumOperands() > 4 ? 2 : -1;
case spv::Op::OpImageSampleDrefImplicitLod:
case spv::Op::OpImageSampleDrefExplicitLod:
case spv::Op::OpImageSampleProjDrefImplicitLod:
case spv::Op::OpImageSampleProjDrefExplicitLod:
case spv::Op::OpImageGather:
case spv::Op::OpImageDrefGather:
case spv::Op::OpImageSparseSampleDrefImplicitLod:
case spv::Op::OpImageSparseSampleDrefExplicitLod:
case spv::Op::OpImageSparseSampleProjDrefImplicitLod:
case spv::Op::OpImageSparseSampleProjDrefExplicitLod:
case spv::Op::OpImageSparseGather:
case spv::Op::OpImageSparseDrefGather:
return inst->NumOperands() > 5 ? 3 : -1;
case spv::Op::OpImageWrite:
return inst->NumOperands() > 3 ? 3 : -1;
default:
return -1;
}
}
// Returns the element width of |type|.
uint32_t ElementWidth(const analysis::Type* type) {
if (const analysis::Vector* vec_type = type->AsVector()) {
return ElementWidth(vec_type->element_type());
} else if (const analysis::Float* float_type = type->AsFloat()) {
return float_type->width();
} else {
assert(type->AsInteger());
return type->AsInteger()->width();
}
}
// Returns true if |type| is Float or a vector of Float.
bool HasFloatingPoint(const analysis::Type* type) {
if (type->AsFloat()) {
return true;
} else if (const analysis::Vector* vec_type = type->AsVector()) {
return vec_type->element_type()->AsFloat() != nullptr;
}
return false;
}
// Returns false if |val| is NaN, infinite or subnormal.
template <typename T>
bool IsValidResult(T val) {
int classified = std::fpclassify(val);
switch (classified) {
case FP_NAN:
case FP_INFINITE:
case FP_SUBNORMAL:
return false;
default:
return true;
}
}
const analysis::Constant* ConstInput(
const std::vector<const analysis::Constant*>& constants) {
return constants[0] ? constants[0] : constants[1];
}
Instruction* NonConstInput(IRContext* context, const analysis::Constant* c,
Instruction* inst) {
uint32_t in_op = c ? 1u : 0u;
return context->get_def_use_mgr()->GetDef(
inst->GetSingleWordInOperand(in_op));
}
std::vector<uint32_t> ExtractInts(uint64_t val) {
std::vector<uint32_t> words;
words.push_back(static_cast<uint32_t>(val));
words.push_back(static_cast<uint32_t>(val >> 32));
return words;
}
std::vector<uint32_t> GetWordsFromScalarIntConstant(
const analysis::IntConstant* c) {
assert(c != nullptr);
uint32_t width = c->type()->AsInteger()->width();
assert(width == 8 || width == 16 || width == 32 || width == 64);
if (width == 64) {
uint64_t uval = static_cast<uint64_t>(c->GetU64());
return ExtractInts(uval);
}
// Section 2.2.1 of the SPIR-V spec guarantees that all integer types
// smaller than 32-bits are automatically zero or sign extended to 32-bits.
return {c->GetU32BitValue()};
}
std::vector<uint32_t> GetWordsFromScalarFloatConstant(
const analysis::FloatConstant* c) {
assert(c != nullptr);
uint32_t width = c->type()->AsFloat()->width();
assert(width == 16 || width == 32 || width == 64);
if (width == 64) {
utils::FloatProxy<double> result(c->GetDouble());
return result.GetWords();
}
// Section 2.2.1 of the SPIR-V spec guarantees that all floating-point types
// smaller than 32-bits are automatically zero extended to 32-bits.
return {c->GetU32BitValue()};
}
std::vector<uint32_t> GetWordsFromNumericScalarOrVectorConstant(
analysis::ConstantManager* const_mgr, const analysis::Constant* c) {
if (const auto* float_constant = c->AsFloatConstant()) {
return GetWordsFromScalarFloatConstant(float_constant);
} else if (const auto* int_constant = c->AsIntConstant()) {
return GetWordsFromScalarIntConstant(int_constant);
} else if (const auto* vec_constant = c->AsVectorConstant()) {
std::vector<uint32_t> words;
for (const auto* comp : vec_constant->GetComponents()) {
auto comp_in_words =
GetWordsFromNumericScalarOrVectorConstant(const_mgr, comp);
words.insert(words.end(), comp_in_words.begin(), comp_in_words.end());
}
return words;
}
return {};
}
const analysis::Constant* ConvertWordsToNumericScalarOrVectorConstant(
analysis::ConstantManager* const_mgr, const std::vector<uint32_t>& words,
const analysis::Type* type) {
if (type->AsInteger() || type->AsFloat())
return const_mgr->GetConstant(type, words);
if (const auto* vec_type = type->AsVector())
return const_mgr->GetNumericVectorConstantWithWords(vec_type, words);
return nullptr;
}
// Returns the negation of |c|. |c| must be a 32 or 64 bit floating point
// constant.
uint32_t NegateFloatingPointConstant(analysis::ConstantManager* const_mgr,
const analysis::Constant* c) {
assert(c);
assert(c->type()->AsFloat());
uint32_t width = c->type()->AsFloat()->width();
assert(width == 32 || width == 64);
std::vector<uint32_t> words;
if (width == 64) {
utils::FloatProxy<double> result(c->GetDouble() * -1.0);
words = result.GetWords();
} else {
utils::FloatProxy<float> result(c->GetFloat() * -1.0f);
words = result.GetWords();
}
const analysis::Constant* negated_const =
const_mgr->GetConstant(c->type(), std::move(words));
return const_mgr->GetDefiningInstruction(negated_const)->result_id();
}
// Negates the integer constant |c|. Returns the id of the defining instruction.
uint32_t NegateIntegerConstant(analysis::ConstantManager* const_mgr,
const analysis::Constant* c) {
assert(c);
assert(c->type()->AsInteger());
uint32_t width = c->type()->AsInteger()->width();
assert(width == 32 || width == 64);
std::vector<uint32_t> words;
if (width == 64) {
uint64_t uval = static_cast<uint64_t>(0 - c->GetU64());
words = ExtractInts(uval);
} else {
words.push_back(static_cast<uint32_t>(0 - c->GetU32()));
}
const analysis::Constant* negated_const =
const_mgr->GetConstant(c->type(), std::move(words));
return const_mgr->GetDefiningInstruction(negated_const)->result_id();
}
// Negates the vector constant |c|. Returns the id of the defining instruction.
uint32_t NegateVectorConstant(analysis::ConstantManager* const_mgr,
const analysis::Constant* c) {
assert(const_mgr && c);
assert(c->type()->AsVector());
if (c->AsNullConstant()) {
// 0.0 vs -0.0 shouldn't matter.
return const_mgr->GetDefiningInstruction(c)->result_id();
} else {
const analysis::Type* component_type =
c->AsVectorConstant()->component_type();
std::vector<uint32_t> words;
for (auto& comp : c->AsVectorConstant()->GetComponents()) {
if (component_type->AsFloat()) {
words.push_back(NegateFloatingPointConstant(const_mgr, comp));
} else {
assert(component_type->AsInteger());
words.push_back(NegateIntegerConstant(const_mgr, comp));
}
}
const analysis::Constant* negated_const =
const_mgr->GetConstant(c->type(), std::move(words));
return const_mgr->GetDefiningInstruction(negated_const)->result_id();
}
}
// Negates |c|. Returns the id of the defining instruction.
uint32_t NegateConstant(analysis::ConstantManager* const_mgr,
const analysis::Constant* c) {
if (c->type()->AsVector()) {
return NegateVectorConstant(const_mgr, c);
} else if (c->type()->AsFloat()) {
return NegateFloatingPointConstant(const_mgr, c);
} else {
assert(c->type()->AsInteger());
return NegateIntegerConstant(const_mgr, c);
}
}
// Takes the reciprocal of |c|. |c|'s type must be Float or a vector of Float.
// Returns 0 if the reciprocal is NaN, infinite or subnormal.
uint32_t Reciprocal(analysis::ConstantManager* const_mgr,
const analysis::Constant* c) {
assert(const_mgr && c);
assert(c->type()->AsFloat());
uint32_t width = c->type()->AsFloat()->width();
assert(width == 32 || width == 64);
std::vector<uint32_t> words;
if (c->IsZero()) {
return 0;
}
if (width == 64) {
spvtools::utils::FloatProxy<double> result(1.0 / c->GetDouble());
if (!IsValidResult(result.getAsFloat())) return 0;
words = result.GetWords();
} else {
spvtools::utils::FloatProxy<float> result(1.0f / c->GetFloat());
if (!IsValidResult(result.getAsFloat())) return 0;
words = result.GetWords();
}
const analysis::Constant* negated_const =
const_mgr->GetConstant(c->type(), std::move(words));
return const_mgr->GetDefiningInstruction(negated_const)->result_id();
}
// Replaces fdiv where second operand is constant with fmul.
FoldingRule ReciprocalFDiv() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFDiv);
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
if (!inst->IsFloatingPointFoldingAllowed()) return false;
uint32_t width = ElementWidth(type);
if (width != 32 && width != 64) return false;
if (constants[1] != nullptr) {
uint32_t id = 0;
if (const analysis::VectorConstant* vector_const =
constants[1]->AsVectorConstant()) {
std::vector<uint32_t> neg_ids;
for (auto& comp : vector_const->GetComponents()) {
id = Reciprocal(const_mgr, comp);
if (id == 0) return false;
neg_ids.push_back(id);
}
const analysis::Constant* negated_const =
const_mgr->GetConstant(constants[1]->type(), std::move(neg_ids));
id = const_mgr->GetDefiningInstruction(negated_const)->result_id();
} else if (constants[1]->AsFloatConstant()) {
id = Reciprocal(const_mgr, constants[1]);
if (id == 0) return false;
} else {
// Don't fold a null constant.
return false;
}
inst->SetOpcode(spv::Op::OpFMul);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {inst->GetSingleWordInOperand(0u)}},
{SPV_OPERAND_TYPE_ID, {id}}});
return true;
}
return false;
};
}
// Elides consecutive negate instructions.
FoldingRule MergeNegateArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFNegate ||
inst->opcode() == spv::Op::OpSNegate);
(void)constants;
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
if (HasFloatingPoint(type) && !inst->IsFloatingPointFoldingAllowed())
return false;
Instruction* op_inst =
context->get_def_use_mgr()->GetDef(inst->GetSingleWordInOperand(0u));
if (HasFloatingPoint(type) && !op_inst->IsFloatingPointFoldingAllowed())
return false;
if (op_inst->opcode() == inst->opcode()) {
// Elide negates.
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {op_inst->GetSingleWordInOperand(0u)}}});
return true;
}
return false;
};
}
// Merges negate into a mul or div operation if that operation contains a
// constant operand.
// Cases:
// -(x * 2) = x * -2
// -(2 * x) = x * -2
// -(x / 2) = x / -2
// -(2 / x) = -2 / x
FoldingRule MergeNegateMulDivArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFNegate ||
inst->opcode() == spv::Op::OpSNegate);
(void)constants;
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
if (HasFloatingPoint(type) && !inst->IsFloatingPointFoldingAllowed())
return false;
Instruction* op_inst =
context->get_def_use_mgr()->GetDef(inst->GetSingleWordInOperand(0u));
if (HasFloatingPoint(type) && !op_inst->IsFloatingPointFoldingAllowed())
return false;
uint32_t width = ElementWidth(type);
if (width != 32 && width != 64) return false;
spv::Op opcode = op_inst->opcode();
if (opcode == spv::Op::OpFMul || opcode == spv::Op::OpFDiv ||
opcode == spv::Op::OpIMul || opcode == spv::Op::OpSDiv ||
opcode == spv::Op::OpUDiv) {
std::vector<const analysis::Constant*> op_constants =
const_mgr->GetOperandConstants(op_inst);
// Merge negate into mul or div if one operand is constant.
if (op_constants[0] || op_constants[1]) {
bool zero_is_variable = op_constants[0] == nullptr;
const analysis::Constant* c = ConstInput(op_constants);
uint32_t neg_id = NegateConstant(const_mgr, c);
uint32_t non_const_id = zero_is_variable
? op_inst->GetSingleWordInOperand(0u)
: op_inst->GetSingleWordInOperand(1u);
// Change this instruction to a mul/div.
inst->SetOpcode(op_inst->opcode());
if (opcode == spv::Op::OpFDiv || opcode == spv::Op::OpUDiv ||
opcode == spv::Op::OpSDiv) {
uint32_t op0 = zero_is_variable ? non_const_id : neg_id;
uint32_t op1 = zero_is_variable ? neg_id : non_const_id;
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {op0}}, {SPV_OPERAND_TYPE_ID, {op1}}});
} else {
inst->SetInOperands({{SPV_OPERAND_TYPE_ID, {non_const_id}},
{SPV_OPERAND_TYPE_ID, {neg_id}}});
}
return true;
}
}
return false;
};
}
// Merges negate into a add or sub operation if that operation contains a
// constant operand.
// Cases:
// -(x + 2) = -2 - x
// -(2 + x) = -2 - x
// -(x - 2) = 2 - x
// -(2 - x) = x - 2
FoldingRule MergeNegateAddSubArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFNegate ||
inst->opcode() == spv::Op::OpSNegate);
(void)constants;
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
if (HasFloatingPoint(type) && !inst->IsFloatingPointFoldingAllowed())
return false;
Instruction* op_inst =
context->get_def_use_mgr()->GetDef(inst->GetSingleWordInOperand(0u));
if (HasFloatingPoint(type) && !op_inst->IsFloatingPointFoldingAllowed())
return false;
uint32_t width = ElementWidth(type);
if (width != 32 && width != 64) return false;
if (op_inst->opcode() == spv::Op::OpFAdd ||
op_inst->opcode() == spv::Op::OpFSub ||
op_inst->opcode() == spv::Op::OpIAdd ||
op_inst->opcode() == spv::Op::OpISub) {
std::vector<const analysis::Constant*> op_constants =
const_mgr->GetOperandConstants(op_inst);
if (op_constants[0] || op_constants[1]) {
bool zero_is_variable = op_constants[0] == nullptr;
bool is_add = (op_inst->opcode() == spv::Op::OpFAdd) ||
(op_inst->opcode() == spv::Op::OpIAdd);
bool swap_operands = !is_add || zero_is_variable;
bool negate_const = is_add;
const analysis::Constant* c = ConstInput(op_constants);
uint32_t const_id = 0;
if (negate_const) {
const_id = NegateConstant(const_mgr, c);
} else {
const_id = zero_is_variable ? op_inst->GetSingleWordInOperand(1u)
: op_inst->GetSingleWordInOperand(0u);
}
// Swap operands if necessary and make the instruction a subtraction.
uint32_t op0 =
zero_is_variable ? op_inst->GetSingleWordInOperand(0u) : const_id;
uint32_t op1 =
zero_is_variable ? const_id : op_inst->GetSingleWordInOperand(1u);
if (swap_operands) std::swap(op0, op1);
inst->SetOpcode(HasFloatingPoint(type) ? spv::Op::OpFSub
: spv::Op::OpISub);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {op0}}, {SPV_OPERAND_TYPE_ID, {op1}}});
return true;
}
}
return false;
};
}
// Returns true if |c| has a zero element.
bool HasZero(const analysis::Constant* c) {
if (c->AsNullConstant()) {
return true;
}
if (const analysis::VectorConstant* vec_const = c->AsVectorConstant()) {
for (auto& comp : vec_const->GetComponents())
if (HasZero(comp)) return true;
} else {
assert(c->AsScalarConstant());
return c->AsScalarConstant()->IsZero();
}
return false;
}
// Performs |input1| |opcode| |input2| and returns the merged constant result
// id. Returns 0 if the result is not a valid value. The input types must be
// Float.
uint32_t PerformFloatingPointOperation(analysis::ConstantManager* const_mgr,
spv::Op opcode,
const analysis::Constant* input1,
const analysis::Constant* input2) {
const analysis::Type* type = input1->type();
assert(type->AsFloat());
uint32_t width = type->AsFloat()->width();
assert(width == 32 || width == 64);
std::vector<uint32_t> words;
#define FOLD_OP(op) \
if (width == 64) { \
utils::FloatProxy<double> val = \
input1->GetDouble() op input2->GetDouble(); \
double dval = val.getAsFloat(); \
if (!IsValidResult(dval)) return 0; \
words = val.GetWords(); \
} else { \
utils::FloatProxy<float> val = input1->GetFloat() op input2->GetFloat(); \
float fval = val.getAsFloat(); \
if (!IsValidResult(fval)) return 0; \
words = val.GetWords(); \
} \
static_assert(true, "require extra semicolon")
switch (opcode) {
case spv::Op::OpFMul:
FOLD_OP(*);
break;
case spv::Op::OpFDiv:
if (HasZero(input2)) return 0;
FOLD_OP(/);
break;
case spv::Op::OpFAdd:
FOLD_OP(+);
break;
case spv::Op::OpFSub:
FOLD_OP(-);
break;
default:
assert(false && "Unexpected operation");
break;
}
#undef FOLD_OP
const analysis::Constant* merged_const = const_mgr->GetConstant(type, words);
return const_mgr->GetDefiningInstruction(merged_const)->result_id();
}
// Performs |input1| |opcode| |input2| and returns the merged constant result
// id. Returns 0 if the result is not a valid value. The input types must be
// Integers.
uint32_t PerformIntegerOperation(analysis::ConstantManager* const_mgr,
spv::Op opcode,
const analysis::Constant* input1,
const analysis::Constant* input2) {
assert(input1->type()->AsInteger());
const analysis::Integer* type = input1->type()->AsInteger();
uint32_t width = type->AsInteger()->width();
assert(width == 32 || width == 64);
std::vector<uint32_t> words;
// Regardless of the sign of the constant, folding is performed on an unsigned
// interpretation of the constant data. This avoids signed integer overflow
// while folding, and works because sign is irrelevant for the IAdd, ISub and
// IMul instructions.
#define FOLD_OP(op) \
if (width == 64) { \
uint64_t val = input1->GetU64() op input2->GetU64(); \
words = ExtractInts(val); \
} else { \
uint32_t val = input1->GetU32() op input2->GetU32(); \
words.push_back(val); \
} \
static_assert(true, "require extra semicolon")
switch (opcode) {
case spv::Op::OpIMul:
FOLD_OP(*);
break;
case spv::Op::OpSDiv:
case spv::Op::OpUDiv:
assert(false && "Should not merge integer division");
break;
case spv::Op::OpIAdd:
FOLD_OP(+);
break;
case spv::Op::OpISub:
FOLD_OP(-);
break;
default:
assert(false && "Unexpected operation");
break;
}
#undef FOLD_OP
const analysis::Constant* merged_const = const_mgr->GetConstant(type, words);
return const_mgr->GetDefiningInstruction(merged_const)->result_id();
}
// Performs |input1| |opcode| |input2| and returns the merged constant result
// id. Returns 0 if the result is not a valid value. The input types must be
// Integers, Floats or Vectors of such.
uint32_t PerformOperation(analysis::ConstantManager* const_mgr, spv::Op opcode,
const analysis::Constant* input1,
const analysis::Constant* input2) {
assert(input1 && input2);
const analysis::Type* type = input1->type();
std::vector<uint32_t> words;
if (const analysis::Vector* vector_type = type->AsVector()) {
const analysis::Type* ele_type = vector_type->element_type();
for (uint32_t i = 0; i != vector_type->element_count(); ++i) {
uint32_t id = 0;
const analysis::Constant* input1_comp = nullptr;
if (const analysis::VectorConstant* input1_vector =
input1->AsVectorConstant()) {
input1_comp = input1_vector->GetComponents()[i];
} else {
assert(input1->AsNullConstant());
input1_comp = const_mgr->GetConstant(ele_type, {});
}
const analysis::Constant* input2_comp = nullptr;
if (const analysis::VectorConstant* input2_vector =
input2->AsVectorConstant()) {
input2_comp = input2_vector->GetComponents()[i];
} else {
assert(input2->AsNullConstant());
input2_comp = const_mgr->GetConstant(ele_type, {});
}
if (ele_type->AsFloat()) {
id = PerformFloatingPointOperation(const_mgr, opcode, input1_comp,
input2_comp);
} else {
assert(ele_type->AsInteger());
id = PerformIntegerOperation(const_mgr, opcode, input1_comp,
input2_comp);
}
if (id == 0) return 0;
words.push_back(id);
}
const analysis::Constant* merged_const =
const_mgr->GetConstant(type, words);
return const_mgr->GetDefiningInstruction(merged_const)->result_id();
} else if (type->AsFloat()) {
return PerformFloatingPointOperation(const_mgr, opcode, input1, input2);
} else {
assert(type->AsInteger());
return PerformIntegerOperation(const_mgr, opcode, input1, input2);
}
}
// Merges consecutive multiplies where each contains one constant operand.
// Cases:
// 2 * (x * 2) = x * 4
// 2 * (2 * x) = x * 4
// (x * 2) * 2 = x * 4
// (2 * x) * 2 = x * 4
FoldingRule MergeMulMulArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFMul ||
inst->opcode() == spv::Op::OpIMul);
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
if (HasFloatingPoint(type) && !inst->IsFloatingPointFoldingAllowed())
return false;
uint32_t width = ElementWidth(type);
if (width != 32 && width != 64) return false;
// Determine the constant input and the variable input in |inst|.
const analysis::Constant* const_input1 = ConstInput(constants);
if (!const_input1) return false;
Instruction* other_inst = NonConstInput(context, constants[0], inst);
if (HasFloatingPoint(type) && !other_inst->IsFloatingPointFoldingAllowed())
return false;
if (other_inst->opcode() == inst->opcode()) {
std::vector<const analysis::Constant*> other_constants =
const_mgr->GetOperandConstants(other_inst);
const analysis::Constant* const_input2 = ConstInput(other_constants);
if (!const_input2) return false;
bool other_first_is_variable = other_constants[0] == nullptr;
uint32_t merged_id = PerformOperation(const_mgr, inst->opcode(),
const_input1, const_input2);
if (merged_id == 0) return false;
uint32_t non_const_id = other_first_is_variable
? other_inst->GetSingleWordInOperand(0u)
: other_inst->GetSingleWordInOperand(1u);
inst->SetInOperands({{SPV_OPERAND_TYPE_ID, {non_const_id}},
{SPV_OPERAND_TYPE_ID, {merged_id}}});
return true;
}
return false;
};
}
// Merges divides into subsequent multiplies if each instruction contains one
// constant operand. Does not support integer operations.
// Cases:
// 2 * (x / 2) = x * 1
// 2 * (2 / x) = 4 / x
// (x / 2) * 2 = x * 1
// (2 / x) * 2 = 4 / x
// (y / x) * x = y
// x * (y / x) = y
FoldingRule MergeMulDivArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFMul);
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
analysis::DefUseManager* def_use_mgr = context->get_def_use_mgr();
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
if (!inst->IsFloatingPointFoldingAllowed()) return false;
uint32_t width = ElementWidth(type);
if (width != 32 && width != 64) return false;
for (uint32_t i = 0; i < 2; i++) {
uint32_t op_id = inst->GetSingleWordInOperand(i);
Instruction* op_inst = def_use_mgr->GetDef(op_id);
if (op_inst->opcode() == spv::Op::OpFDiv) {
if (op_inst->GetSingleWordInOperand(1) ==
inst->GetSingleWordInOperand(1 - i)) {
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {op_inst->GetSingleWordInOperand(0)}}});
return true;
}
}
}
const analysis::Constant* const_input1 = ConstInput(constants);
if (!const_input1) return false;
Instruction* other_inst = NonConstInput(context, constants[0], inst);
if (!other_inst->IsFloatingPointFoldingAllowed()) return false;
if (other_inst->opcode() == spv::Op::OpFDiv) {
std::vector<const analysis::Constant*> other_constants =
const_mgr->GetOperandConstants(other_inst);
const analysis::Constant* const_input2 = ConstInput(other_constants);
if (!const_input2 || HasZero(const_input2)) return false;
bool other_first_is_variable = other_constants[0] == nullptr;
// If the variable value is the second operand of the divide, multiply
// the constants together. Otherwise divide the constants.
uint32_t merged_id = PerformOperation(
const_mgr,
other_first_is_variable ? other_inst->opcode() : inst->opcode(),
const_input1, const_input2);
if (merged_id == 0) return false;
uint32_t non_const_id = other_first_is_variable
? other_inst->GetSingleWordInOperand(0u)
: other_inst->GetSingleWordInOperand(1u);
// If the variable value is on the second operand of the div, then this
// operation is a div. Otherwise it should be a multiply.
inst->SetOpcode(other_first_is_variable ? inst->opcode()
: other_inst->opcode());
if (other_first_is_variable) {
inst->SetInOperands({{SPV_OPERAND_TYPE_ID, {non_const_id}},
{SPV_OPERAND_TYPE_ID, {merged_id}}});
} else {
inst->SetInOperands({{SPV_OPERAND_TYPE_ID, {merged_id}},
{SPV_OPERAND_TYPE_ID, {non_const_id}}});
}
return true;
}
return false;
};
}
// Merges multiply of constant and negation.
// Cases:
// (-x) * 2 = x * -2
// 2 * (-x) = x * -2
FoldingRule MergeMulNegateArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFMul ||
inst->opcode() == spv::Op::OpIMul);
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
bool uses_float = HasFloatingPoint(type);
if (uses_float && !inst->IsFloatingPointFoldingAllowed()) return false;
uint32_t width = ElementWidth(type);
if (width != 32 && width != 64) return false;
const analysis::Constant* const_input1 = ConstInput(constants);
if (!const_input1) return false;
Instruction* other_inst = NonConstInput(context, constants[0], inst);
if (uses_float && !other_inst->IsFloatingPointFoldingAllowed())
return false;
if (other_inst->opcode() == spv::Op::OpFNegate ||
other_inst->opcode() == spv::Op::OpSNegate) {
uint32_t neg_id = NegateConstant(const_mgr, const_input1);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {other_inst->GetSingleWordInOperand(0u)}},
{SPV_OPERAND_TYPE_ID, {neg_id}}});
return true;
}
return false;
};
}
// Merges consecutive divides if each instruction contains one constant operand.
// Does not support integer division.
// Cases:
// 2 / (x / 2) = 4 / x
// 4 / (2 / x) = 2 * x
// (4 / x) / 2 = 2 / x
// (x / 2) / 2 = x / 4
FoldingRule MergeDivDivArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFDiv);
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
if (!inst->IsFloatingPointFoldingAllowed()) return false;
uint32_t width = ElementWidth(type);
if (width != 32 && width != 64) return false;
const analysis::Constant* const_input1 = ConstInput(constants);
if (!const_input1 || HasZero(const_input1)) return false;
Instruction* other_inst = NonConstInput(context, constants[0], inst);
if (!other_inst->IsFloatingPointFoldingAllowed()) return false;
bool first_is_variable = constants[0] == nullptr;
if (other_inst->opcode() == inst->opcode()) {
std::vector<const analysis::Constant*> other_constants =
const_mgr->GetOperandConstants(other_inst);
const analysis::Constant* const_input2 = ConstInput(other_constants);
if (!const_input2 || HasZero(const_input2)) return false;
bool other_first_is_variable = other_constants[0] == nullptr;
spv::Op merge_op = inst->opcode();
if (other_first_is_variable) {
// Constants magnify.
merge_op = spv::Op::OpFMul;
}
// This is an x / (*) case. Swap the inputs. Doesn't harm multiply
// because it is commutative.
if (first_is_variable) std::swap(const_input1, const_input2);
uint32_t merged_id =
PerformOperation(const_mgr, merge_op, const_input1, const_input2);
if (merged_id == 0) return false;
uint32_t non_const_id = other_first_is_variable
? other_inst->GetSingleWordInOperand(0u)
: other_inst->GetSingleWordInOperand(1u);
spv::Op op = inst->opcode();
if (!first_is_variable && !other_first_is_variable) {
// Effectively div of 1/x, so change to multiply.
op = spv::Op::OpFMul;
}
uint32_t op1 = merged_id;
uint32_t op2 = non_const_id;
if (first_is_variable && other_first_is_variable) std::swap(op1, op2);
inst->SetOpcode(op);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {op1}}, {SPV_OPERAND_TYPE_ID, {op2}}});
return true;
}
return false;
};
}
// Fold multiplies succeeded by divides where each instruction contains a
// constant operand. Does not support integer divide.
// Cases:
// 4 / (x * 2) = 2 / x
// 4 / (2 * x) = 2 / x
// (x * 4) / 2 = x * 2
// (4 * x) / 2 = x * 2
// (x * y) / x = y
// (y * x) / x = y
FoldingRule MergeDivMulArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFDiv);
analysis::DefUseManager* def_use_mgr = context->get_def_use_mgr();
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
if (!inst->IsFloatingPointFoldingAllowed()) return false;
uint32_t width = ElementWidth(type);
if (width != 32 && width != 64) return false;
uint32_t op_id = inst->GetSingleWordInOperand(0);
Instruction* op_inst = def_use_mgr->GetDef(op_id);
if (op_inst->opcode() == spv::Op::OpFMul) {
for (uint32_t i = 0; i < 2; i++) {
if (op_inst->GetSingleWordInOperand(i) ==
inst->GetSingleWordInOperand(1)) {
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands({{SPV_OPERAND_TYPE_ID,
{op_inst->GetSingleWordInOperand(1 - i)}}});
return true;
}
}
}
const analysis::Constant* const_input1 = ConstInput(constants);
if (!const_input1 || HasZero(const_input1)) return false;
Instruction* other_inst = NonConstInput(context, constants[0], inst);
if (!other_inst->IsFloatingPointFoldingAllowed()) return false;
bool first_is_variable = constants[0] == nullptr;
if (other_inst->opcode() == spv::Op::OpFMul) {
std::vector<const analysis::Constant*> other_constants =
const_mgr->GetOperandConstants(other_inst);
const analysis::Constant* const_input2 = ConstInput(other_constants);
if (!const_input2) return false;
bool other_first_is_variable = other_constants[0] == nullptr;
// This is an x / (*) case. Swap the inputs.
if (first_is_variable) std::swap(const_input1, const_input2);
uint32_t merged_id = PerformOperation(const_mgr, inst->opcode(),
const_input1, const_input2);
if (merged_id == 0) return false;
uint32_t non_const_id = other_first_is_variable
? other_inst->GetSingleWordInOperand(0u)
: other_inst->GetSingleWordInOperand(1u);
uint32_t op1 = merged_id;
uint32_t op2 = non_const_id;
if (first_is_variable) std::swap(op1, op2);
// Convert to multiply
if (first_is_variable) inst->SetOpcode(other_inst->opcode());
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {op1}}, {SPV_OPERAND_TYPE_ID, {op2}}});
return true;
}
return false;
};
}
// Fold divides of a constant and a negation.
// Cases:
// (-x) / 2 = x / -2
// 2 / (-x) = -2 / x
FoldingRule MergeDivNegateArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFDiv);
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
if (!inst->IsFloatingPointFoldingAllowed()) return false;
const analysis::Constant* const_input1 = ConstInput(constants);
if (!const_input1) return false;
Instruction* other_inst = NonConstInput(context, constants[0], inst);
if (!other_inst->IsFloatingPointFoldingAllowed()) return false;
bool first_is_variable = constants[0] == nullptr;
if (other_inst->opcode() == spv::Op::OpFNegate) {
uint32_t neg_id = NegateConstant(const_mgr, const_input1);
if (first_is_variable) {
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {other_inst->GetSingleWordInOperand(0u)}},
{SPV_OPERAND_TYPE_ID, {neg_id}}});
} else {
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {neg_id}},
{SPV_OPERAND_TYPE_ID, {other_inst->GetSingleWordInOperand(0u)}}});
}
return true;
}
return false;
};
}
// Folds addition of a constant and a negation.
// Cases:
// (-x) + 2 = 2 - x
// 2 + (-x) = 2 - x
FoldingRule MergeAddNegateArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFAdd ||
inst->opcode() == spv::Op::OpIAdd);
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
bool uses_float = HasFloatingPoint(type);
if (uses_float && !inst->IsFloatingPointFoldingAllowed()) return false;
const analysis::Constant* const_input1 = ConstInput(constants);
if (!const_input1) return false;
Instruction* other_inst = NonConstInput(context, constants[0], inst);
if (uses_float && !other_inst->IsFloatingPointFoldingAllowed())
return false;
if (other_inst->opcode() == spv::Op::OpSNegate ||
other_inst->opcode() == spv::Op::OpFNegate) {
inst->SetOpcode(HasFloatingPoint(type) ? spv::Op::OpFSub
: spv::Op::OpISub);
uint32_t const_id = constants[0] ? inst->GetSingleWordInOperand(0u)
: inst->GetSingleWordInOperand(1u);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {const_id}},
{SPV_OPERAND_TYPE_ID, {other_inst->GetSingleWordInOperand(0u)}}});
return true;
}
return false;
};
}
// Folds subtraction of a constant and a negation.
// Cases:
// (-x) - 2 = -2 - x
// 2 - (-x) = x + 2
FoldingRule MergeSubNegateArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFSub ||
inst->opcode() == spv::Op::OpISub);
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
bool uses_float = HasFloatingPoint(type);
if (uses_float && !inst->IsFloatingPointFoldingAllowed()) return false;
uint32_t width = ElementWidth(type);
if (width != 32 && width != 64) return false;
const analysis::Constant* const_input1 = ConstInput(constants);
if (!const_input1) return false;
Instruction* other_inst = NonConstInput(context, constants[0], inst);
if (uses_float && !other_inst->IsFloatingPointFoldingAllowed())
return false;
if (other_inst->opcode() == spv::Op::OpSNegate ||
other_inst->opcode() == spv::Op::OpFNegate) {
uint32_t op1 = 0;
uint32_t op2 = 0;
spv::Op opcode = inst->opcode();
if (constants[0] != nullptr) {
op1 = other_inst->GetSingleWordInOperand(0u);
op2 = inst->GetSingleWordInOperand(0u);
opcode = HasFloatingPoint(type) ? spv::Op::OpFAdd : spv::Op::OpIAdd;
} else {
op1 = NegateConstant(const_mgr, const_input1);
op2 = other_inst->GetSingleWordInOperand(0u);
}
inst->SetOpcode(opcode);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {op1}}, {SPV_OPERAND_TYPE_ID, {op2}}});
return true;
}
return false;
};
}
// Folds addition of an addition where each operation has a constant operand.
// Cases:
// (x + 2) + 2 = x + 4
// (2 + x) + 2 = x + 4
// 2 + (x + 2) = x + 4
// 2 + (2 + x) = x + 4
FoldingRule MergeAddAddArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFAdd ||
inst->opcode() == spv::Op::OpIAdd);
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
bool uses_float = HasFloatingPoint(type);
if (uses_float && !inst->IsFloatingPointFoldingAllowed()) return false;
uint32_t width = ElementWidth(type);
if (width != 32 && width != 64) return false;
const analysis::Constant* const_input1 = ConstInput(constants);
if (!const_input1) return false;
Instruction* other_inst = NonConstInput(context, constants[0], inst);
if (uses_float && !other_inst->IsFloatingPointFoldingAllowed())
return false;
if (other_inst->opcode() == spv::Op::OpFAdd ||
other_inst->opcode() == spv::Op::OpIAdd) {
std::vector<const analysis::Constant*> other_constants =
const_mgr->GetOperandConstants(other_inst);
const analysis::Constant* const_input2 = ConstInput(other_constants);
if (!const_input2) return false;
Instruction* non_const_input =
NonConstInput(context, other_constants[0], other_inst);
uint32_t merged_id = PerformOperation(const_mgr, inst->opcode(),
const_input1, const_input2);
if (merged_id == 0) return false;
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {non_const_input->result_id()}},
{SPV_OPERAND_TYPE_ID, {merged_id}}});
return true;
}
return false;
};
}
// Folds addition of a subtraction where each operation has a constant operand.
// Cases:
// (x - 2) + 2 = x + 0
// (2 - x) + 2 = 4 - x
// 2 + (x - 2) = x + 0
// 2 + (2 - x) = 4 - x
FoldingRule MergeAddSubArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFAdd ||
inst->opcode() == spv::Op::OpIAdd);
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
bool uses_float = HasFloatingPoint(type);
if (uses_float && !inst->IsFloatingPointFoldingAllowed()) return false;
uint32_t width = ElementWidth(type);
if (width != 32 && width != 64) return false;
const analysis::Constant* const_input1 = ConstInput(constants);
if (!const_input1) return false;
Instruction* other_inst = NonConstInput(context, constants[0], inst);
if (uses_float && !other_inst->IsFloatingPointFoldingAllowed())
return false;
if (other_inst->opcode() == spv::Op::OpFSub ||
other_inst->opcode() == spv::Op::OpISub) {
std::vector<const analysis::Constant*> other_constants =
const_mgr->GetOperandConstants(other_inst);
const analysis::Constant* const_input2 = ConstInput(other_constants);
if (!const_input2) return false;
bool first_is_variable = other_constants[0] == nullptr;
spv::Op op = inst->opcode();
uint32_t op1 = 0;
uint32_t op2 = 0;
if (first_is_variable) {
// Subtract constants. Non-constant operand is first.
op1 = other_inst->GetSingleWordInOperand(0u);
op2 = PerformOperation(const_mgr, other_inst->opcode(), const_input1,
const_input2);
} else {
// Add constants. Constant operand is first. Change the opcode.
op1 = PerformOperation(const_mgr, inst->opcode(), const_input1,
const_input2);
op2 = other_inst->GetSingleWordInOperand(1u);
op = other_inst->opcode();
}
if (op1 == 0 || op2 == 0) return false;
inst->SetOpcode(op);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {op1}}, {SPV_OPERAND_TYPE_ID, {op2}}});
return true;
}
return false;
};
}
// Folds subtraction of an addition where each operand has a constant operand.
// Cases:
// (x + 2) - 2 = x + 0
// (2 + x) - 2 = x + 0
// 2 - (x + 2) = 0 - x
// 2 - (2 + x) = 0 - x
FoldingRule MergeSubAddArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFSub ||
inst->opcode() == spv::Op::OpISub);
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
bool uses_float = HasFloatingPoint(type);
if (uses_float && !inst->IsFloatingPointFoldingAllowed()) return false;
uint32_t width = ElementWidth(type);
if (width != 32 && width != 64) return false;
const analysis::Constant* const_input1 = ConstInput(constants);
if (!const_input1) return false;
Instruction* other_inst = NonConstInput(context, constants[0], inst);
if (uses_float && !other_inst->IsFloatingPointFoldingAllowed())
return false;
if (other_inst->opcode() == spv::Op::OpFAdd ||
other_inst->opcode() == spv::Op::OpIAdd) {
std::vector<const analysis::Constant*> other_constants =
const_mgr->GetOperandConstants(other_inst);
const analysis::Constant* const_input2 = ConstInput(other_constants);
if (!const_input2) return false;
Instruction* non_const_input =
NonConstInput(context, other_constants[0], other_inst);
// If the first operand of the sub is not a constant, swap the constants
// so the subtraction has the correct operands.
if (constants[0] == nullptr) std::swap(const_input1, const_input2);
// Subtract the constants.
uint32_t merged_id = PerformOperation(const_mgr, inst->opcode(),
const_input1, const_input2);
spv::Op op = inst->opcode();
uint32_t op1 = 0;
uint32_t op2 = 0;
if (constants[0] == nullptr) {
// Non-constant operand is first. Change the opcode.
op1 = non_const_input->result_id();
op2 = merged_id;
op = other_inst->opcode();
} else {
// Constant operand is first.
op1 = merged_id;
op2 = non_const_input->result_id();
}
if (op1 == 0 || op2 == 0) return false;
inst->SetOpcode(op);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {op1}}, {SPV_OPERAND_TYPE_ID, {op2}}});
return true;
}
return false;
};
}
// Folds subtraction of a subtraction where each operand has a constant operand.
// Cases:
// (x - 2) - 2 = x - 4
// (2 - x) - 2 = 0 - x
// 2 - (x - 2) = 4 - x
// 2 - (2 - x) = x + 0
FoldingRule MergeSubSubArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFSub ||
inst->opcode() == spv::Op::OpISub);
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
bool uses_float = HasFloatingPoint(type);
if (uses_float && !inst->IsFloatingPointFoldingAllowed()) return false;
uint32_t width = ElementWidth(type);
if (width != 32 && width != 64) return false;
const analysis::Constant* const_input1 = ConstInput(constants);
if (!const_input1) return false;
Instruction* other_inst = NonConstInput(context, constants[0], inst);
if (uses_float && !other_inst->IsFloatingPointFoldingAllowed())
return false;
if (other_inst->opcode() == spv::Op::OpFSub ||
other_inst->opcode() == spv::Op::OpISub) {
std::vector<const analysis::Constant*> other_constants =
const_mgr->GetOperandConstants(other_inst);
const analysis::Constant* const_input2 = ConstInput(other_constants);
if (!const_input2) return false;
Instruction* non_const_input =
NonConstInput(context, other_constants[0], other_inst);
// Merge the constants.
uint32_t merged_id = 0;
spv::Op merge_op = inst->opcode();
if (other_constants[0] == nullptr) {
merge_op = uses_float ? spv::Op::OpFAdd : spv::Op::OpIAdd;
} else if (constants[0] == nullptr) {
std::swap(const_input1, const_input2);
}
merged_id =
PerformOperation(const_mgr, merge_op, const_input1, const_input2);
if (merged_id == 0) return false;
spv::Op op = inst->opcode();
if (constants[0] != nullptr && other_constants[0] != nullptr) {
// Change the operation.
op = uses_float ? spv::Op::OpFAdd : spv::Op::OpIAdd;
}
uint32_t op1 = 0;
uint32_t op2 = 0;
if ((constants[0] == nullptr) ^ (other_constants[0] == nullptr)) {
op1 = merged_id;
op2 = non_const_input->result_id();
} else {
op1 = non_const_input->result_id();
op2 = merged_id;
}
inst->SetOpcode(op);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {op1}}, {SPV_OPERAND_TYPE_ID, {op2}}});
return true;
}
return false;
};
}
// Helper function for MergeGenericAddSubArithmetic. If |addend| and
// subtrahend of |sub| is the same, merge to copy of minuend of |sub|.
bool MergeGenericAddendSub(uint32_t addend, uint32_t sub, Instruction* inst) {
IRContext* context = inst->context();
analysis::DefUseManager* def_use_mgr = context->get_def_use_mgr();
Instruction* sub_inst = def_use_mgr->GetDef(sub);
if (sub_inst->opcode() != spv::Op::OpFSub &&
sub_inst->opcode() != spv::Op::OpISub)
return false;
if (sub_inst->opcode() == spv::Op::OpFSub &&
!sub_inst->IsFloatingPointFoldingAllowed())
return false;
if (addend != sub_inst->GetSingleWordInOperand(1)) return false;
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {sub_inst->GetSingleWordInOperand(0)}}});
context->UpdateDefUse(inst);
return true;
}
// Folds addition of a subtraction where the subtrahend is equal to the
// other addend. Return a copy of the minuend. Accepts generic (const and
// non-const) operands.
// Cases:
// (a - b) + b = a
// b + (a - b) = a
FoldingRule MergeGenericAddSubArithmetic() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>&) {
assert(inst->opcode() == spv::Op::OpFAdd ||
inst->opcode() == spv::Op::OpIAdd);
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
bool uses_float = HasFloatingPoint(type);
if (uses_float && !inst->IsFloatingPointFoldingAllowed()) return false;
uint32_t width = ElementWidth(type);
if (width != 32 && width != 64) return false;
uint32_t add_op0 = inst->GetSingleWordInOperand(0);
uint32_t add_op1 = inst->GetSingleWordInOperand(1);
if (MergeGenericAddendSub(add_op0, add_op1, inst)) return true;
return MergeGenericAddendSub(add_op1, add_op0, inst);
};
}
// Helper function for FactorAddMuls. If |factor0_0| is the same as |factor1_0|,
// generate |factor0_0| * (|factor0_1| + |factor1_1|).
bool FactorAddMulsOpnds(uint32_t factor0_0, uint32_t factor0_1,
uint32_t factor1_0, uint32_t factor1_1,
Instruction* inst) {
IRContext* context = inst->context();
if (factor0_0 != factor1_0) return false;
InstructionBuilder ir_builder(
context, inst,
IRContext::kAnalysisDefUse | IRContext::kAnalysisInstrToBlockMapping);
Instruction* new_add_inst = ir_builder.AddBinaryOp(
inst->type_id(), inst->opcode(), factor0_1, factor1_1);
inst->SetOpcode(inst->opcode() == spv::Op::OpFAdd ? spv::Op::OpFMul
: spv::Op::OpIMul);
inst->SetInOperands({{SPV_OPERAND_TYPE_ID, {factor0_0}},
{SPV_OPERAND_TYPE_ID, {new_add_inst->result_id()}}});
context->UpdateDefUse(inst);
return true;
}
// Perform the following factoring identity, handling all operand order
// combinations: (a * b) + (a * c) = a * (b + c)
FoldingRule FactorAddMuls() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>&) {
assert(inst->opcode() == spv::Op::OpFAdd ||
inst->opcode() == spv::Op::OpIAdd);
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
bool uses_float = HasFloatingPoint(type);
if (uses_float && !inst->IsFloatingPointFoldingAllowed()) return false;
analysis::DefUseManager* def_use_mgr = context->get_def_use_mgr();
uint32_t add_op0 = inst->GetSingleWordInOperand(0);
Instruction* add_op0_inst = def_use_mgr->GetDef(add_op0);
if (add_op0_inst->opcode() != spv::Op::OpFMul &&
add_op0_inst->opcode() != spv::Op::OpIMul)
return false;
uint32_t add_op1 = inst->GetSingleWordInOperand(1);
Instruction* add_op1_inst = def_use_mgr->GetDef(add_op1);
if (add_op1_inst->opcode() != spv::Op::OpFMul &&
add_op1_inst->opcode() != spv::Op::OpIMul)
return false;
// Only perform this optimization if both of the muls only have one use.
// Otherwise this is a deoptimization in size and performance.
if (def_use_mgr->NumUses(add_op0_inst) > 1) return false;
if (def_use_mgr->NumUses(add_op1_inst) > 1) return false;
if (add_op0_inst->opcode() == spv::Op::OpFMul &&
(!add_op0_inst->IsFloatingPointFoldingAllowed() ||
!add_op1_inst->IsFloatingPointFoldingAllowed()))
return false;
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
// Check if operand i in add_op0_inst matches operand j in add_op1_inst.
if (FactorAddMulsOpnds(add_op0_inst->GetSingleWordInOperand(i),
add_op0_inst->GetSingleWordInOperand(1 - i),
add_op1_inst->GetSingleWordInOperand(j),
add_op1_inst->GetSingleWordInOperand(1 - j),
inst))
return true;
}
}
return false;
};
}
// Replaces |inst| inplace with an FMA instruction |(x*y)+a|.
void ReplaceWithFma(Instruction* inst, uint32_t x, uint32_t y, uint32_t a) {
uint32_t ext =
inst->context()->get_feature_mgr()->GetExtInstImportId_GLSLstd450();
if (ext == 0) {
inst->context()->AddExtInstImport("GLSL.std.450");
ext = inst->context()->get_feature_mgr()->GetExtInstImportId_GLSLstd450();
assert(ext != 0 &&
"Could not add the GLSL.std.450 extended instruction set");
}
std::vector<Operand> operands;
operands.push_back({SPV_OPERAND_TYPE_ID, {ext}});
operands.push_back({SPV_OPERAND_TYPE_LITERAL_INTEGER, {GLSLstd450Fma}});
operands.push_back({SPV_OPERAND_TYPE_ID, {x}});
operands.push_back({SPV_OPERAND_TYPE_ID, {y}});
operands.push_back({SPV_OPERAND_TYPE_ID, {a}});
inst->SetOpcode(spv::Op::OpExtInst);
inst->SetInOperands(std::move(operands));
}
// Folds a multiple and add into an Fma.
//
// Cases:
// (x * y) + a = Fma x y a
// a + (x * y) = Fma x y a
bool MergeMulAddArithmetic(IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>&) {
assert(inst->opcode() == spv::Op::OpFAdd);
if (!inst->IsFloatingPointFoldingAllowed()) {
return false;
}
analysis::DefUseManager* def_use_mgr = context->get_def_use_mgr();
for (int i = 0; i < 2; i++) {
uint32_t op_id = inst->GetSingleWordInOperand(i);
Instruction* op_inst = def_use_mgr->GetDef(op_id);
if (op_inst->opcode() != spv::Op::OpFMul) {
continue;
}
if (!op_inst->IsFloatingPointFoldingAllowed()) {
continue;
}
uint32_t x = op_inst->GetSingleWordInOperand(0);
uint32_t y = op_inst->GetSingleWordInOperand(1);
uint32_t a = inst->GetSingleWordInOperand((i + 1) % 2);
ReplaceWithFma(inst, x, y, a);
return true;
}
return false;
}
// Replaces |sub| inplace with an FMA instruction |(x*y)+a| where |a| first gets
// negated if |negate_addition| is true, otherwise |x| gets negated.
void ReplaceWithFmaAndNegate(Instruction* sub, uint32_t x, uint32_t y,
uint32_t a, bool negate_addition) {
uint32_t ext =
sub->context()->get_feature_mgr()->GetExtInstImportId_GLSLstd450();
if (ext == 0) {
sub->context()->AddExtInstImport("GLSL.std.450");
ext = sub->context()->get_feature_mgr()->GetExtInstImportId_GLSLstd450();
assert(ext != 0 &&
"Could not add the GLSL.std.450 extended instruction set");
}
InstructionBuilder ir_builder(
sub->context(), sub,
IRContext::kAnalysisDefUse | IRContext::kAnalysisInstrToBlockMapping);
Instruction* neg = ir_builder.AddUnaryOp(sub->type_id(), spv::Op::OpFNegate,
negate_addition ? a : x);
uint32_t neg_op = neg->result_id(); // -a : -x
std::vector<Operand> operands;
operands.push_back({SPV_OPERAND_TYPE_ID, {ext}});
operands.push_back({SPV_OPERAND_TYPE_LITERAL_INTEGER, {GLSLstd450Fma}});
operands.push_back({SPV_OPERAND_TYPE_ID, {negate_addition ? x : neg_op}});
operands.push_back({SPV_OPERAND_TYPE_ID, {y}});
operands.push_back({SPV_OPERAND_TYPE_ID, {negate_addition ? neg_op : a}});
sub->SetOpcode(spv::Op::OpExtInst);
sub->SetInOperands(std::move(operands));
}
// Folds a multiply and subtract into an Fma and negation.
//
// Cases:
// (x * y) - a = Fma x y -a
// a - (x * y) = Fma -x y a
bool MergeMulSubArithmetic(IRContext* context, Instruction* sub,
const std::vector<const analysis::Constant*>&) {
assert(sub->opcode() == spv::Op::OpFSub);
if (!sub->IsFloatingPointFoldingAllowed()) {
return false;
}
analysis::DefUseManager* def_use_mgr = context->get_def_use_mgr();
for (int i = 0; i < 2; i++) {
uint32_t op_id = sub->GetSingleWordInOperand(i);
Instruction* mul = def_use_mgr->GetDef(op_id);
if (mul->opcode() != spv::Op::OpFMul) {
continue;
}
if (!mul->IsFloatingPointFoldingAllowed()) {
continue;
}
uint32_t x = mul->GetSingleWordInOperand(0);
uint32_t y = mul->GetSingleWordInOperand(1);
uint32_t a = sub->GetSingleWordInOperand((i + 1) % 2);
ReplaceWithFmaAndNegate(sub, x, y, a, i == 0);
return true;
}
return false;
}
FoldingRule IntMultipleBy1() {
return [](IRContext*, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpIMul &&
"Wrong opcode. Should be OpIMul.");
for (uint32_t i = 0; i < 2; i++) {
if (constants[i] == nullptr) {
continue;
}
const analysis::IntConstant* int_constant = constants[i]->AsIntConstant();
if (int_constant) {
uint32_t width = ElementWidth(int_constant->type());
if (width != 32 && width != 64) return false;
bool is_one = (width == 32) ? int_constant->GetU32BitValue() == 1u
: int_constant->GetU64BitValue() == 1ull;
if (is_one) {
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {inst->GetSingleWordInOperand(1 - i)}}});
return true;
}
}
}
return false;
};
}
// Returns the number of elements that the |index|th in operand in |inst|
// contributes to the result of |inst|. |inst| must be an
// OpCompositeConstructInstruction.
uint32_t GetNumOfElementsContributedByOperand(IRContext* context,
const Instruction* inst,
uint32_t index) {
assert(inst->opcode() == spv::Op::OpCompositeConstruct);
analysis::DefUseManager* def_use_mgr = context->get_def_use_mgr();
analysis::TypeManager* type_mgr = context->get_type_mgr();
analysis::Vector* result_type =
type_mgr->GetType(inst->type_id())->AsVector();
if (result_type == nullptr) {
// If the result of the OpCompositeConstruct is not a vector then every
// operands corresponds to a single element in the result.
return 1;
}
// If the result type is a vector then the operands are either scalars or
// vectors. If it is a scalar, then it corresponds to a single element. If it
// is a vector, then each element in the vector will be an element in the
// result.
uint32_t id = inst->GetSingleWordInOperand(index);
Instruction* def = def_use_mgr->GetDef(id);
analysis::Vector* type = type_mgr->GetType(def->type_id())->AsVector();
if (type == nullptr) {
return 1;
}
return type->element_count();
}
// Returns the in-operands for an OpCompositeExtract instruction that are needed
// to extract the |result_index|th element in the result of |inst| without using
// the result of |inst|. Returns the empty vector if |result_index| is
// out-of-bounds. |inst| must be an |OpCompositeConstruct| instruction.
std::vector<Operand> GetExtractOperandsForElementOfCompositeConstruct(
IRContext* context, const Instruction* inst, uint32_t result_index) {
assert(inst->opcode() == spv::Op::OpCompositeConstruct);
analysis::DefUseManager* def_use_mgr = context->get_def_use_mgr();
analysis::TypeManager* type_mgr = context->get_type_mgr();
analysis::Type* result_type = type_mgr->GetType(inst->type_id());
if (result_type->AsVector() == nullptr) {
if (result_index < inst->NumInOperands()) {
uint32_t id = inst->GetSingleWordInOperand(result_index);
return {Operand(SPV_OPERAND_TYPE_ID, {id})};
}
return {};
}
// If the result type is a vector, then vector operands are concatenated.
uint32_t total_element_count = 0;
for (uint32_t idx = 0; idx < inst->NumInOperands(); ++idx) {
uint32_t element_count =
GetNumOfElementsContributedByOperand(context, inst, idx);
total_element_count += element_count;
if (result_index < total_element_count) {
std::vector<Operand> operands;
uint32_t id = inst->GetSingleWordInOperand(idx);
Instruction* operand_def = def_use_mgr->GetDef(id);
analysis::Type* operand_type = type_mgr->GetType(operand_def->type_id());
operands.push_back({SPV_OPERAND_TYPE_ID, {id}});
if (operand_type->AsVector()) {
uint32_t start_index_of_id = total_element_count - element_count;
uint32_t index_into_id = result_index - start_index_of_id;
operands.push_back({SPV_OPERAND_TYPE_LITERAL_INTEGER, {index_into_id}});
}
return operands;
}
}
return {};
}
bool CompositeConstructFeedingExtract(
IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>&) {
// If the input to an OpCompositeExtract is an OpCompositeConstruct,
// then we can simply use the appropriate element in the construction.
assert(inst->opcode() == spv::Op::OpCompositeExtract &&
"Wrong opcode. Should be OpCompositeExtract.");
analysis::DefUseManager* def_use_mgr = context->get_def_use_mgr();
// If there are no index operands, then this rule cannot do anything.
if (inst->NumInOperands() <= 1) {
return false;
}
uint32_t cid = inst->GetSingleWordInOperand(kExtractCompositeIdInIdx);
Instruction* cinst = def_use_mgr->GetDef(cid);
if (cinst->opcode() != spv::Op::OpCompositeConstruct) {
return false;
}
uint32_t index_into_result = inst->GetSingleWordInOperand(1);
std::vector<Operand> operands =
GetExtractOperandsForElementOfCompositeConstruct(context, cinst,
index_into_result);
if (operands.empty()) {
return false;
}
// Add the remaining indices for extraction.
for (uint32_t i = 2; i < inst->NumInOperands(); ++i) {
operands.push_back(
{SPV_OPERAND_TYPE_LITERAL_INTEGER, {inst->GetSingleWordInOperand(i)}});
}
if (operands.size() == 1) {
// If there were no extra indices, then we have the final object. No need
// to extract any more.
inst->SetOpcode(spv::Op::OpCopyObject);
}
inst->SetInOperands(std::move(operands));
return true;
}
// Walks the indexes chain from |start| to |end| of an OpCompositeInsert or
// OpCompositeExtract instruction, and returns the type of the final element
// being accessed.
const analysis::Type* GetElementType(uint32_t type_id,
Instruction::iterator start,
Instruction::iterator end,
const analysis::TypeManager* type_mgr) {
const analysis::Type* type = type_mgr->GetType(type_id);
for (auto index : make_range(std::move(start), std::move(end))) {
assert(index.type == SPV_OPERAND_TYPE_LITERAL_INTEGER &&
index.words.size() == 1);
if (auto* array_type = type->AsArray()) {
type = array_type->element_type();
} else if (auto* matrix_type = type->AsMatrix()) {
type = matrix_type->element_type();
} else if (auto* struct_type = type->AsStruct()) {
type = struct_type->element_types()[index.words[0]];
} else {
type = nullptr;
}
}
return type;
}
// Returns true of |inst_1| and |inst_2| have the same indexes that will be used
// to index into a composite object, excluding the last index. The two
// instructions must have the same opcode, and be either OpCompositeExtract or
// OpCompositeInsert instructions.
bool HaveSameIndexesExceptForLast(Instruction* inst_1, Instruction* inst_2) {
assert(inst_1->opcode() == inst_2->opcode() &&
"Expecting the opcodes to be the same.");
assert((inst_1->opcode() == spv::Op::OpCompositeInsert ||
inst_1->opcode() == spv::Op::OpCompositeExtract) &&
"Instructions must be OpCompositeInsert or OpCompositeExtract.");
if (inst_1->NumInOperands() != inst_2->NumInOperands()) {
return false;
}
uint32_t first_index_position =
(inst_1->opcode() == spv::Op::OpCompositeInsert ? 2 : 1);
for (uint32_t i = first_index_position; i < inst_1->NumInOperands() - 1;
i++) {
if (inst_1->GetSingleWordInOperand(i) !=
inst_2->GetSingleWordInOperand(i)) {
return false;
}
}
return true;
}
// If the OpCompositeConstruct is simply putting back together elements that
// where extracted from the same source, we can simply reuse the source.
//
// This is a common code pattern because of the way that scalar replacement
// works.
bool CompositeExtractFeedingConstruct(
IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>&) {
assert(inst->opcode() == spv::Op::OpCompositeConstruct &&
"Wrong opcode. Should be OpCompositeConstruct.");
analysis::DefUseManager* def_use_mgr = context->get_def_use_mgr();
uint32_t original_id = 0;
if (inst->NumInOperands() == 0) {
// The struct being constructed has no members.
return false;
}
// Check each element to make sure they are:
// - extractions
// - extracting the same position they are inserting
// - all extract from the same id.
Instruction* first_element_inst = nullptr;
for (uint32_t i = 0; i < inst->NumInOperands(); ++i) {
const uint32_t element_id = inst->GetSingleWordInOperand(i);
Instruction* element_inst = def_use_mgr->GetDef(element_id);
if (first_element_inst == nullptr) {
first_element_inst = element_inst;
}
if (element_inst->opcode() != spv::Op::OpCompositeExtract) {
return false;
}
if (!HaveSameIndexesExceptForLast(element_inst, first_element_inst)) {
return false;
}
if (element_inst->GetSingleWordInOperand(element_inst->NumInOperands() -
1) != i) {
return false;
}
if (i == 0) {
original_id =
element_inst->GetSingleWordInOperand(kExtractCompositeIdInIdx);
} else if (original_id !=
element_inst->GetSingleWordInOperand(kExtractCompositeIdInIdx)) {
return false;
}
}
// The last check it to see that the object being extracted from is the
// correct type.
Instruction* original_inst = def_use_mgr->GetDef(original_id);
analysis::TypeManager* type_mgr = context->get_type_mgr();
const analysis::Type* original_type =
GetElementType(original_inst->type_id(), first_element_inst->begin() + 3,
first_element_inst->end() - 1, type_mgr);
if (original_type == nullptr) {
return false;
}
if (inst->type_id() != type_mgr->GetId(original_type)) {
return false;
}
if (first_element_inst->NumInOperands() == 2) {
// Simplify by using the original object.
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands({{SPV_OPERAND_TYPE_ID, {original_id}}});
return true;
}
// Copies the original id and all indexes except for the last to the new
// extract instruction.
inst->SetOpcode(spv::Op::OpCompositeExtract);
inst->SetInOperands(std::vector<Operand>(first_element_inst->begin() + 2,
first_element_inst->end() - 1));
return true;
}
FoldingRule InsertFeedingExtract() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>&) {
assert(inst->opcode() == spv::Op::OpCompositeExtract &&
"Wrong opcode. Should be OpCompositeExtract.");
analysis::DefUseManager* def_use_mgr = context->get_def_use_mgr();
uint32_t cid = inst->GetSingleWordInOperand(kExtractCompositeIdInIdx);
Instruction* cinst = def_use_mgr->GetDef(cid);
if (cinst->opcode() != spv::Op::OpCompositeInsert) {
return false;
}
// Find the first position where the list of insert and extract indicies
// differ, if at all.
uint32_t i;
for (i = 1; i < inst->NumInOperands(); ++i) {
if (i + 1 >= cinst->NumInOperands()) {
break;
}
if (inst->GetSingleWordInOperand(i) !=
cinst->GetSingleWordInOperand(i + 1)) {
break;
}
}
// We are extracting the element that was inserted.
if (i == inst->NumInOperands() && i + 1 == cinst->NumInOperands()) {
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID,
{cinst->GetSingleWordInOperand(kInsertObjectIdInIdx)}}});
return true;
}
// Extracting the value that was inserted along with values for the base
// composite. Cannot do anything.
if (i == inst->NumInOperands()) {
return false;
}
// Extracting an element of the value that was inserted. Extract from
// that value directly.
if (i + 1 == cinst->NumInOperands()) {
std::vector<Operand> operands;
operands.push_back(
{SPV_OPERAND_TYPE_ID,
{cinst->GetSingleWordInOperand(kInsertObjectIdInIdx)}});
for (; i < inst->NumInOperands(); ++i) {
operands.push_back({SPV_OPERAND_TYPE_LITERAL_INTEGER,
{inst->GetSingleWordInOperand(i)}});
}
inst->SetInOperands(std::move(operands));
return true;
}
// Extracting a value that is disjoint from the element being inserted.
// Rewrite the extract to use the composite input to the insert.
std::vector<Operand> operands;
operands.push_back(
{SPV_OPERAND_TYPE_ID,
{cinst->GetSingleWordInOperand(kInsertCompositeIdInIdx)}});
for (i = 1; i < inst->NumInOperands(); ++i) {
operands.push_back({SPV_OPERAND_TYPE_LITERAL_INTEGER,
{inst->GetSingleWordInOperand(i)}});
}
inst->SetInOperands(std::move(operands));
return true;
};
}
// When a VectorShuffle is feeding an Extract, we can extract from one of the
// operands of the VectorShuffle. We just need to adjust the index in the
// extract instruction.
FoldingRule VectorShuffleFeedingExtract() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>&) {
assert(inst->opcode() == spv::Op::OpCompositeExtract &&
"Wrong opcode. Should be OpCompositeExtract.");
analysis::DefUseManager* def_use_mgr = context->get_def_use_mgr();
analysis::TypeManager* type_mgr = context->get_type_mgr();
uint32_t cid = inst->GetSingleWordInOperand(kExtractCompositeIdInIdx);
Instruction* cinst = def_use_mgr->GetDef(cid);
if (cinst->opcode() != spv::Op::OpVectorShuffle) {
return false;
}
// Find the size of the first vector operand of the VectorShuffle
Instruction* first_input =
def_use_mgr->GetDef(cinst->GetSingleWordInOperand(0));
analysis::Type* first_input_type =
type_mgr->GetType(first_input->type_id());
assert(first_input_type->AsVector() &&
"Input to vector shuffle should be vectors.");
uint32_t first_input_size = first_input_type->AsVector()->element_count();
// Get index of the element the vector shuffle is placing in the position
// being extracted.
uint32_t new_index =
cinst->GetSingleWordInOperand(2 + inst->GetSingleWordInOperand(1));
// Extracting an undefined value so fold this extract into an undef.
const uint32_t undef_literal_value = 0xffffffff;
if (new_index == undef_literal_value) {
inst->SetOpcode(spv::Op::OpUndef);
inst->SetInOperands({});
return true;
}
// Get the id of the of the vector the elemtent comes from, and update the
// index if needed.
uint32_t new_vector = 0;
if (new_index < first_input_size) {
new_vector = cinst->GetSingleWordInOperand(0);
} else {
new_vector = cinst->GetSingleWordInOperand(1);
new_index -= first_input_size;
}
// Update the extract instruction.
inst->SetInOperand(kExtractCompositeIdInIdx, {new_vector});
inst->SetInOperand(1, {new_index});
return true;
};
}
// When an FMix with is feeding an Extract that extracts an element whose
// corresponding |a| in the FMix is 0 or 1, we can extract from one of the
// operands of the FMix.
FoldingRule FMixFeedingExtract() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>&) {
assert(inst->opcode() == spv::Op::OpCompositeExtract &&
"Wrong opcode. Should be OpCompositeExtract.");
analysis::DefUseManager* def_use_mgr = context->get_def_use_mgr();
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
uint32_t composite_id =
inst->GetSingleWordInOperand(kExtractCompositeIdInIdx);
Instruction* composite_inst = def_use_mgr->GetDef(composite_id);
if (composite_inst->opcode() != spv::Op::OpExtInst) {
return false;
}
uint32_t inst_set_id =
context->get_feature_mgr()->GetExtInstImportId_GLSLstd450();
if (composite_inst->GetSingleWordInOperand(kExtInstSetIdInIdx) !=
inst_set_id ||
composite_inst->GetSingleWordInOperand(kExtInstInstructionInIdx) !=
GLSLstd450FMix) {
return false;
}
// Get the |a| for the FMix instruction.
uint32_t a_id = composite_inst->GetSingleWordInOperand(kFMixAIdInIdx);
std::unique_ptr<Instruction> a(inst->Clone(context));
a->SetInOperand(kExtractCompositeIdInIdx, {a_id});
context->get_instruction_folder().FoldInstruction(a.get());
if (a->opcode() != spv::Op::OpCopyObject) {
return false;
}
const analysis::Constant* a_const =
const_mgr->FindDeclaredConstant(a->GetSingleWordInOperand(0));
if (!a_const) {
return false;
}
bool use_x = false;
assert(a_const->type()->AsFloat());
double element_value = a_const->GetValueAsDouble();
if (element_value == 0.0) {
use_x = true;
} else if (element_value == 1.0) {
use_x = false;
} else {
return false;
}
// Get the id of the of the vector the element comes from.
uint32_t new_vector = 0;
if (use_x) {
new_vector = composite_inst->GetSingleWordInOperand(kFMixXIdInIdx);
} else {
new_vector = composite_inst->GetSingleWordInOperand(kFMixYIdInIdx);
}
// Update the extract instruction.
inst->SetInOperand(kExtractCompositeIdInIdx, {new_vector});
return true;
};
}
// Returns the number of elements in the composite type |type|. Returns 0 if
// |type| is a scalar value. Return UINT32_MAX when the size is unknown at
// compile time.
uint32_t GetNumberOfElements(const analysis::Type* type) {
if (auto* vector_type = type->AsVector()) {
return vector_type->element_count();
}
if (auto* matrix_type = type->AsMatrix()) {
return matrix_type->element_count();
}
if (auto* struct_type = type->AsStruct()) {
return static_cast<uint32_t>(struct_type->element_types().size());
}
if (auto* array_type = type->AsArray()) {
if (array_type->length_info().words[0] ==
analysis::Array::LengthInfo::kConstant &&
array_type->length_info().words.size() == 2) {
return array_type->length_info().words[1];
}
return UINT32_MAX;
}
return 0;
}
// Returns a map with the set of values that were inserted into an object by
// the chain of OpCompositeInsertInstruction starting with |inst|.
// The map will map the index to the value inserted at that index. An empty map
// will be returned if the map could not be properly generated.
std::map<uint32_t, uint32_t> GetInsertedValues(Instruction* inst) {
analysis::DefUseManager* def_use_mgr = inst->context()->get_def_use_mgr();
std::map<uint32_t, uint32_t> values_inserted;
Instruction* current_inst = inst;
while (current_inst->opcode() == spv::Op::OpCompositeInsert) {
if (current_inst->NumInOperands() > inst->NumInOperands()) {
// This is to catch the case
// %2 = OpCompositeInsert %m2x2int %v2int_1_0 %m2x2int_undef 0
// %3 = OpCompositeInsert %m2x2int %int_4 %2 0 0
// %4 = OpCompositeInsert %m2x2int %v2int_2_3 %3 1
// In this case we cannot do a single construct to get the matrix.
uint32_t partially_inserted_element_index =
current_inst->GetSingleWordInOperand(inst->NumInOperands() - 1);
if (values_inserted.count(partially_inserted_element_index) == 0)
return {};
}
if (HaveSameIndexesExceptForLast(inst, current_inst)) {
values_inserted.insert(
{current_inst->GetSingleWordInOperand(current_inst->NumInOperands() -
1),
current_inst->GetSingleWordInOperand(kInsertObjectIdInIdx)});
}
current_inst = def_use_mgr->GetDef(
current_inst->GetSingleWordInOperand(kInsertCompositeIdInIdx));
}
return values_inserted;
}
// Returns true of there is an entry in |values_inserted| for every element of
// |Type|.
bool DoInsertedValuesCoverEntireObject(
const analysis::Type* type, std::map<uint32_t, uint32_t>& values_inserted) {
uint32_t container_size = GetNumberOfElements(type);
if (container_size != values_inserted.size()) {
return false;
}
if (values_inserted.rbegin()->first >= container_size) {
return false;
}
return true;
}
// Returns the type of the element that immediately contains the element being
// inserted by the OpCompositeInsert instruction |inst|.
const analysis::Type* GetContainerType(Instruction* inst) {
assert(inst->opcode() == spv::Op::OpCompositeInsert);
analysis::TypeManager* type_mgr = inst->context()->get_type_mgr();
return GetElementType(inst->type_id(), inst->begin() + 4, inst->end() - 1,
type_mgr);
}
// Returns an OpCompositeConstruct instruction that build an object with
// |type_id| out of the values in |values_inserted|. Each value will be
// placed at the index corresponding to the value. The new instruction will
// be placed before |insert_before|.
Instruction* BuildCompositeConstruct(
uint32_t type_id, const std::map<uint32_t, uint32_t>& values_inserted,
Instruction* insert_before) {
InstructionBuilder ir_builder(
insert_before->context(), insert_before,
IRContext::kAnalysisDefUse | IRContext::kAnalysisInstrToBlockMapping);
std::vector<uint32_t> ids_in_order;
for (auto it : values_inserted) {
ids_in_order.push_back(it.second);
}
Instruction* construct =
ir_builder.AddCompositeConstruct(type_id, ids_in_order);
return construct;
}
// Replaces the OpCompositeInsert |inst| that inserts |construct| into the same
// object as |inst| with final index removed. If the resulting
// OpCompositeInsert instruction would have no remaining indexes, the
// instruction is replaced with an OpCopyObject instead.
void InsertConstructedObject(Instruction* inst, const Instruction* construct) {
if (inst->NumInOperands() == 3) {
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands({{SPV_OPERAND_TYPE_ID, {construct->result_id()}}});
} else {
inst->SetInOperand(kInsertObjectIdInIdx, {construct->result_id()});
inst->RemoveOperand(inst->NumOperands() - 1);
}
}
// Replaces a series of |OpCompositeInsert| instruction that cover the entire
// object with an |OpCompositeConstruct|.
bool CompositeInsertToCompositeConstruct(
IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>&) {
assert(inst->opcode() == spv::Op::OpCompositeInsert &&
"Wrong opcode. Should be OpCompositeInsert.");
if (inst->NumInOperands() < 3) return false;
std::map<uint32_t, uint32_t> values_inserted = GetInsertedValues(inst);
const analysis::Type* container_type = GetContainerType(inst);
if (container_type == nullptr) {
return false;
}
if (!DoInsertedValuesCoverEntireObject(container_type, values_inserted)) {
return false;
}
analysis::TypeManager* type_mgr = context->get_type_mgr();
Instruction* construct = BuildCompositeConstruct(
type_mgr->GetId(container_type), values_inserted, inst);
InsertConstructedObject(inst, construct);
return true;
}
FoldingRule RedundantPhi() {
// An OpPhi instruction where all values are the same or the result of the phi
// itself, can be replaced by the value itself.
return [](IRContext*, Instruction* inst,
const std::vector<const analysis::Constant*>&) {
assert(inst->opcode() == spv::Op::OpPhi &&
"Wrong opcode. Should be OpPhi.");
uint32_t incoming_value = 0;
for (uint32_t i = 0; i < inst->NumInOperands(); i += 2) {
uint32_t op_id = inst->GetSingleWordInOperand(i);
if (op_id == inst->result_id()) {
continue;
}
if (incoming_value == 0) {
incoming_value = op_id;
} else if (op_id != incoming_value) {
// Found two possible value. Can't simplify.
return false;
}
}
if (incoming_value == 0) {
// Code looks invalid. Don't do anything.
return false;
}
// We have a single incoming value. Simplify using that value.
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands({{SPV_OPERAND_TYPE_ID, {incoming_value}}});
return true;
};
}
FoldingRule BitCastScalarOrVector() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpBitcast && constants.size() == 1);
if (constants[0] == nullptr) return false;
const analysis::Type* type =
context->get_type_mgr()->GetType(inst->type_id());
if (HasFloatingPoint(type) && !inst->IsFloatingPointFoldingAllowed())
return false;
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
std::vector<uint32_t> words =
GetWordsFromNumericScalarOrVectorConstant(const_mgr, constants[0]);
if (words.size() == 0) return false;
const analysis::Constant* bitcasted_constant =
ConvertWordsToNumericScalarOrVectorConstant(const_mgr, words, type);
if (!bitcasted_constant) return false;
auto new_feeder_id =
const_mgr->GetDefiningInstruction(bitcasted_constant, inst->type_id())
->result_id();
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands({{SPV_OPERAND_TYPE_ID, {new_feeder_id}}});
return true;
};
}
FoldingRule RedundantSelect() {
// An OpSelect instruction where both values are the same or the condition is
// constant can be replaced by one of the values
return [](IRContext*, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpSelect &&
"Wrong opcode. Should be OpSelect.");
assert(inst->NumInOperands() == 3);
assert(constants.size() == 3);
uint32_t true_id = inst->GetSingleWordInOperand(1);
uint32_t false_id = inst->GetSingleWordInOperand(2);
if (true_id == false_id) {
// Both results are the same, condition doesn't matter
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands({{SPV_OPERAND_TYPE_ID, {true_id}}});
return true;
} else if (constants[0]) {
const analysis::Type* type = constants[0]->type();
if (type->AsBool()) {
// Scalar constant value, select the corresponding value.
inst->SetOpcode(spv::Op::OpCopyObject);
if (constants[0]->AsNullConstant() ||
!constants[0]->AsBoolConstant()->value()) {
inst->SetInOperands({{SPV_OPERAND_TYPE_ID, {false_id}}});
} else {
inst->SetInOperands({{SPV_OPERAND_TYPE_ID, {true_id}}});
}
return true;
} else {
assert(type->AsVector());
if (constants[0]->AsNullConstant()) {
// All values come from false id.
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands({{SPV_OPERAND_TYPE_ID, {false_id}}});
return true;
} else {
// Convert to a vector shuffle.
std::vector<Operand> ops;
ops.push_back({SPV_OPERAND_TYPE_ID, {true_id}});
ops.push_back({SPV_OPERAND_TYPE_ID, {false_id}});
const analysis::VectorConstant* vector_const =
constants[0]->AsVectorConstant();
uint32_t size =
static_cast<uint32_t>(vector_const->GetComponents().size());
for (uint32_t i = 0; i != size; ++i) {
const analysis::Constant* component =
vector_const->GetComponents()[i];
if (component->AsNullConstant() ||
!component->AsBoolConstant()->value()) {
// Selecting from the false vector which is the second input
// vector to the shuffle. Offset the index by |size|.
ops.push_back({SPV_OPERAND_TYPE_LITERAL_INTEGER, {i + size}});
} else {
// Selecting from true vector which is the first input vector to
// the shuffle.
ops.push_back({SPV_OPERAND_TYPE_LITERAL_INTEGER, {i}});
}
}
inst->SetOpcode(spv::Op::OpVectorShuffle);
inst->SetInOperands(std::move(ops));
return true;
}
}
}
return false;
};
}
enum class FloatConstantKind { Unknown, Zero, One };
FloatConstantKind getFloatConstantKind(const analysis::Constant* constant) {
if (constant == nullptr) {
return FloatConstantKind::Unknown;
}
assert(HasFloatingPoint(constant->type()) && "Unexpected constant type");
if (constant->AsNullConstant()) {
return FloatConstantKind::Zero;
} else if (const analysis::VectorConstant* vc =
constant->AsVectorConstant()) {
const std::vector<const analysis::Constant*>& components =
vc->GetComponents();
assert(!components.empty());
FloatConstantKind kind = getFloatConstantKind(components[0]);
for (size_t i = 1; i < components.size(); ++i) {
if (getFloatConstantKind(components[i]) != kind) {
return FloatConstantKind::Unknown;
}
}
return kind;
} else if (const analysis::FloatConstant* fc = constant->AsFloatConstant()) {
if (fc->IsZero()) return FloatConstantKind::Zero;
uint32_t width = fc->type()->AsFloat()->width();
if (width != 32 && width != 64) return FloatConstantKind::Unknown;
double value = (width == 64) ? fc->GetDoubleValue() : fc->GetFloatValue();
if (value == 0.0) {
return FloatConstantKind::Zero;
} else if (value == 1.0) {
return FloatConstantKind::One;
} else {
return FloatConstantKind::Unknown;
}
} else {
return FloatConstantKind::Unknown;
}
}
FoldingRule RedundantFAdd() {
return [](IRContext*, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFAdd &&
"Wrong opcode. Should be OpFAdd.");
assert(constants.size() == 2);
if (!inst->IsFloatingPointFoldingAllowed()) {
return false;
}
FloatConstantKind kind0 = getFloatConstantKind(constants[0]);
FloatConstantKind kind1 = getFloatConstantKind(constants[1]);
if (kind0 == FloatConstantKind::Zero || kind1 == FloatConstantKind::Zero) {
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands({{SPV_OPERAND_TYPE_ID,
{inst->GetSingleWordInOperand(
kind0 == FloatConstantKind::Zero ? 1 : 0)}}});
return true;
}
return false;
};
}
FoldingRule RedundantFSub() {
return [](IRContext*, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFSub &&
"Wrong opcode. Should be OpFSub.");
assert(constants.size() == 2);
if (!inst->IsFloatingPointFoldingAllowed()) {
return false;
}
FloatConstantKind kind0 = getFloatConstantKind(constants[0]);
FloatConstantKind kind1 = getFloatConstantKind(constants[1]);
if (kind0 == FloatConstantKind::Zero) {
inst->SetOpcode(spv::Op::OpFNegate);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {inst->GetSingleWordInOperand(1)}}});
return true;
}
if (kind1 == FloatConstantKind::Zero) {
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {inst->GetSingleWordInOperand(0)}}});
return true;
}
return false;
};
}
FoldingRule RedundantFMul() {
return [](IRContext*, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFMul &&
"Wrong opcode. Should be OpFMul.");
assert(constants.size() == 2);
if (!inst->IsFloatingPointFoldingAllowed()) {
return false;
}
FloatConstantKind kind0 = getFloatConstantKind(constants[0]);
FloatConstantKind kind1 = getFloatConstantKind(constants[1]);
if (kind0 == FloatConstantKind::Zero || kind1 == FloatConstantKind::Zero) {
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands({{SPV_OPERAND_TYPE_ID,
{inst->GetSingleWordInOperand(
kind0 == FloatConstantKind::Zero ? 0 : 1)}}});
return true;
}
if (kind0 == FloatConstantKind::One || kind1 == FloatConstantKind::One) {
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands({{SPV_OPERAND_TYPE_ID,
{inst->GetSingleWordInOperand(
kind0 == FloatConstantKind::One ? 1 : 0)}}});
return true;
}
return false;
};
}
FoldingRule RedundantFDiv() {
return [](IRContext*, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpFDiv &&
"Wrong opcode. Should be OpFDiv.");
assert(constants.size() == 2);
if (!inst->IsFloatingPointFoldingAllowed()) {
return false;
}
FloatConstantKind kind0 = getFloatConstantKind(constants[0]);
FloatConstantKind kind1 = getFloatConstantKind(constants[1]);
if (kind0 == FloatConstantKind::Zero) {
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {inst->GetSingleWordInOperand(0)}}});
return true;
}
if (kind1 == FloatConstantKind::One) {
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID, {inst->GetSingleWordInOperand(0)}}});
return true;
}
return false;
};
}
FoldingRule RedundantFMix() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpExtInst &&
"Wrong opcode. Should be OpExtInst.");
if (!inst->IsFloatingPointFoldingAllowed()) {
return false;
}
uint32_t instSetId =
context->get_feature_mgr()->GetExtInstImportId_GLSLstd450();
if (inst->GetSingleWordInOperand(kExtInstSetIdInIdx) == instSetId &&
inst->GetSingleWordInOperand(kExtInstInstructionInIdx) ==
GLSLstd450FMix) {
assert(constants.size() == 5);
FloatConstantKind kind4 = getFloatConstantKind(constants[4]);
if (kind4 == FloatConstantKind::Zero || kind4 == FloatConstantKind::One) {
inst->SetOpcode(spv::Op::OpCopyObject);
inst->SetInOperands(
{{SPV_OPERAND_TYPE_ID,
{inst->GetSingleWordInOperand(kind4 == FloatConstantKind::Zero
? kFMixXIdInIdx
: kFMixYIdInIdx)}}});
return true;
}
}
return false;
};
}
// This rule handles addition of zero for integers.
FoldingRule RedundantIAdd() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpIAdd &&
"Wrong opcode. Should be OpIAdd.");
uint32_t operand = std::numeric_limits<uint32_t>::max();
const analysis::Type* operand_type = nullptr;
if (constants[0] && constants[0]->IsZero()) {
operand = inst->GetSingleWordInOperand(1);
operand_type = constants[0]->type();
} else if (constants[1] && constants[1]->IsZero()) {
operand = inst->GetSingleWordInOperand(0);
operand_type = constants[1]->type();
}
if (operand != std::numeric_limits<uint32_t>::max()) {
const analysis::Type* inst_type =
context->get_type_mgr()->GetType(inst->type_id());
if (inst_type->IsSame(operand_type)) {
inst->SetOpcode(spv::Op::OpCopyObject);
} else {
inst->SetOpcode(spv::Op::OpBitcast);
}
inst->SetInOperands({{SPV_OPERAND_TYPE_ID, {operand}}});
return true;
}
return false;
};
}
// This rule look for a dot with a constant vector containing a single 1 and
// the rest 0s. This is the same as doing an extract.
FoldingRule DotProductDoingExtract() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
assert(inst->opcode() == spv::Op::OpDot &&
"Wrong opcode. Should be OpDot.");
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
if (!inst->IsFloatingPointFoldingAllowed()) {
return false;
}
for (int i = 0; i < 2; ++i) {
if (!constants[i]) {
continue;
}
const analysis::Vector* vector_type = constants[i]->type()->AsVector();
assert(vector_type && "Inputs to OpDot must be vectors.");
const analysis::Float* element_type =
vector_type->element_type()->AsFloat();
assert(element_type && "Inputs to OpDot must be vectors of floats.");
uint32_t element_width = element_type->width();
if (element_width != 32 && element_width != 64) {
return false;
}
std::vector<const analysis::Constant*> components;
components = constants[i]->GetVectorComponents(const_mgr);
constexpr uint32_t kNotFound = std::numeric_limits<uint32_t>::max();
uint32_t component_with_one = kNotFound;
bool all_others_zero = true;
for (uint32_t j = 0; j < components.size(); ++j) {
const analysis::Constant* element = components[j];
double value =
(element_width == 32 ? element->GetFloat() : element->GetDouble());
if (value == 0.0) {
continue;
} else if (value == 1.0) {
if (component_with_one == kNotFound) {
component_with_one = j;
} else {
component_with_one = kNotFound;
break;
}
} else {
all_others_zero = false;
break;
}
}
if (!all_others_zero || component_with_one == kNotFound) {
continue;
}
std::vector<Operand> operands;
operands.push_back(
{SPV_OPERAND_TYPE_ID, {inst->GetSingleWordInOperand(1u - i)}});
operands.push_back(
{SPV_OPERAND_TYPE_LITERAL_INTEGER, {component_with_one}});
inst->SetOpcode(spv::Op::OpCompositeExtract);
inst->SetInOperands(std::move(operands));
return true;
}
return false;
};
}
// If we are storing an undef, then we can remove the store.
//
// TODO: We can do something similar for OpImageWrite, but checking for volatile
// is complicated. Waiting to see if it is needed.
FoldingRule StoringUndef() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>&) {
assert(inst->opcode() == spv::Op::OpStore &&
"Wrong opcode. Should be OpStore.");
analysis::DefUseManager* def_use_mgr = context->get_def_use_mgr();
// If this is a volatile store, the store cannot be removed.
if (inst->NumInOperands() == 3) {
if (inst->GetSingleWordInOperand(2) &
uint32_t(spv::MemoryAccessMask::Volatile)) {
return false;
}
}
uint32_t object_id = inst->GetSingleWordInOperand(kStoreObjectInIdx);
Instruction* object_inst = def_use_mgr->GetDef(object_id);
if (object_inst->opcode() == spv::Op::OpUndef) {
inst->ToNop();
return true;
}
return false;
};
}
FoldingRule VectorShuffleFeedingShuffle() {
return [](IRContext* context, Instruction* inst,
const std::vector<const analysis::Constant*>&) {
assert(inst->opcode() == spv::Op::OpVectorShuffle &&
"Wrong opcode. Should be OpVectorShuffle.");
analysis::DefUseManager* def_use_mgr = context->get_def_use_mgr();
analysis::TypeManager* type_mgr = context->get_type_mgr();
Instruction* feeding_shuffle_inst =
def_use_mgr->GetDef(inst->GetSingleWordInOperand(0));
analysis::Vector* op0_type =
type_mgr->GetType(feeding_shuffle_inst->type_id())->AsVector();
uint32_t op0_length = op0_type->element_count();
bool feeder_is_op0 = true;
if (feeding_shuffle_inst->opcode() != spv::Op::OpVectorShuffle) {
feeding_shuffle_inst =
def_use_mgr->GetDef(inst->GetSingleWordInOperand(1));
feeder_is_op0 = false;
}
if (feeding_shuffle_inst->opcode() != spv::Op::OpVectorShuffle) {
return false;
}
Instruction* feeder2 =
def_use_mgr->GetDef(feeding_shuffle_inst->GetSingleWordInOperand(0));
analysis::Vector* feeder_op0_type =
type_mgr->GetType(feeder2->type_id())->AsVector();
uint32_t feeder_op0_length = feeder_op0_type->element_count();
uint32_t new_feeder_id = 0;
std::vector<Operand> new_operands;
new_operands.resize(
2, {SPV_OPERAND_TYPE_ID, {0}}); // Place holders for vector operands.
const uint32_t undef_literal = 0xffffffff;
for (uint32_t op = 2; op < inst->NumInOperands(); ++op) {
uint32_t component_index = inst->GetSingleWordInOperand(op);
// Do not interpret the undefined value literal as coming from operand 1.
if (component_index != undef_literal &&
feeder_is_op0 == (component_index < op0_length)) {
// This component comes from the feeding_shuffle_inst. Update
// |component_index| to be the index into the operand of the feeder.
// Adjust component_index to get the index into the operands of the
// feeding_shuffle_inst.
if (component_index >= op0_length) {
component_index -= op0_length;
}
component_index =
feeding_shuffle_inst->GetSingleWordInOperand(component_index + 2);
// Check if we are using a component from the first or second operand of
// the feeding instruction.
if (component_index < feeder_op0_length) {
if (new_feeder_id == 0) {
// First time through, save the id of the operand the element comes
// from.
new_feeder_id = feeding_shuffle_inst->GetSingleWordInOperand(0);
} else if (new_feeder_id !=
feeding_shuffle_inst->GetSingleWordInOperand(0)) {
// We need both elements of the feeding_shuffle_inst, so we cannot
// fold.
return false;
}
} else if (component_index != undef_literal) {
if (new_feeder_id == 0) {
// First time through, save the id of the operand the element comes
// from.
new_feeder_id = feeding_shuffle_inst->GetSingleWordInOperand(1);
} else if (new_feeder_id !=
feeding_shuffle_inst->GetSingleWordInOperand(1)) {
// We need both elements of the feeding_shuffle_inst, so we cannot
// fold.
return false;
}
component_index -= feeder_op0_length;
}
if (!feeder_is_op0 && component_index != undef_literal) {
component_index += op0_length;
}
}
new_operands.push_back(
{SPV_OPERAND_TYPE_LITERAL_INTEGER, {component_index}});
}
if (new_feeder_id == 0) {
analysis::ConstantManager* const_mgr = context->get_constant_mgr();
const analysis::Type* type =
type_mgr->GetType(feeding_shuffle_inst->type_id());
const analysis::Constant* null_const = const_mgr->GetConstant(type, {});
new_feeder_id =
const_mgr->GetDefiningInstruction(null_const, 0)->result_id();
}
if (feeder_is_op0) {
// If the size of the first vector operand changed then the indices
// referring to the second operand need to be adjusted.
Instruction* new_feeder_inst = def_use_mgr->GetDef(new_feeder_id);
analysis::Type* new_feeder_type =
type_mgr->GetType(new_feeder_inst->type_id());
uint32_t new_op0_size = new_feeder_type->AsVector()->element_count();
int32_t adjustment = op0_length - new_op0_size;
if (adjustment != 0) {
for (uint32_t i = 2; i < new_operands.size(); i++) {
uint32_t operand = inst->GetSingleWordInOperand(i);
if (operand >= op0_length && operand != undef_literal) {
new_operands[i].words[0] -= adjustment;
}
}
}
new_operands[0].words[0] = new_feeder_id;
new_operands[1] = inst->GetInOperand(1);
} else {
new_operands[1].words[0] = new_feeder_id;
new_operands[0] = inst->GetInOperand(0);
}
inst->SetInOperands(std::move(new_operands));
return true;
};
}
// Removes duplicate ids from the interface list of an OpEntryPoint
// instruction.
FoldingRule RemoveRedundantOperands() {
return [](IRContext*, Instruction* inst,
const std::vector<const analysis::Constant*>&) {
assert(inst->opcode() == spv::Op::OpEntryPoint &&
"Wrong opcode. Should be OpEntryPoint.");
bool has_redundant_operand = false;
std::unordered_set<uint32_t> seen_operands;
std::vector<Operand> new_operands;
new_operands.emplace_back(inst->GetOperand(0));
new_operands.emplace_back(inst->GetOperand(1));
new_operands.emplace_back(inst->GetOperand(2));
for (uint32_t i = 3; i < inst->NumOperands(); ++i) {
if (seen_operands.insert(inst->GetSingleWordOperand(i)).second) {
new_operands.emplace_back(inst->GetOperand(i));
} else {
has_redundant_operand = true;
}
}
if (!has_redundant_operand) {
return false;
}
inst->SetInOperands(std::move(new_operands));
return true;
};
}
// If an image instruction's operand is a constant, updates the image operand
// flag from Offset to ConstOffset.
FoldingRule UpdateImageOperands() {
return [](IRContext*, Instruction* inst,
const std::vector<const analysis::Constant*>& constants) {
const auto opcode = inst->opcode();
(void)opcode;
assert((opcode == spv::Op::OpImageSampleImplicitLod ||
opcode == spv::Op::OpImageSampleExplicitLod ||
opcode == spv::Op::OpImageSampleDrefImplicitLod ||
opcode == spv::Op::OpImageSampleDrefExplicitLod ||
opcode == spv::Op::OpImageSampleProjImplicitLod ||
opcode == spv::Op::OpImageSampleProjExplicitLod ||
opcode == spv::Op::OpImageSampleProjDrefImplicitLod ||
opcode == spv::Op::OpImageSampleProjDrefExplicitLod ||
opcode == spv::Op::OpImageFetch ||
opcode == spv::Op::OpImageGather ||
opcode == spv::Op::OpImageDrefGather ||
opcode == spv::Op::OpImageRead || opcode == spv::Op::OpImageWrite ||
opcode == spv::Op::OpImageSparseSampleImplicitLod ||
opcode == spv::Op::OpImageSparseSampleExplicitLod ||
opcode == spv::Op::OpImageSparseSampleDrefImplicitLod ||
opcode == spv::Op::OpImageSparseSampleDrefExplicitLod ||
opcode == spv::Op::OpImageSparseSampleProjImplicitLod ||
opcode == spv::Op::OpImageSparseSampleProjExplicitLod ||
opcode == spv::Op::OpImageSparseSampleProjDrefImplicitLod ||
opcode == spv::Op::OpImageSparseSampleProjDrefExplicitLod ||
opcode == spv::Op::OpImageSparseFetch ||
opcode == spv::Op::OpImageSparseGather ||
opcode == spv::Op::OpImageSparseDrefGather ||
opcode == spv::Op::OpImageSparseRead) &&
"Wrong opcode. Should be an image instruction.");
int32_t operand_index = ImageOperandsMaskInOperandIndex(inst);
if (operand_index >= 0) {
auto image_operands = inst->GetSingleWordInOperand(operand_index);
if (image_operands & uint32_t(spv::ImageOperandsMask::Offset)) {
uint32_t offset_operand_index = operand_index + 1;
if (image_operands & uint32_t(spv::ImageOperandsMask::Bias))
offset_operand_index++;
if (image_operands & uint32_t(spv::ImageOperandsMask::Lod))
offset_operand_index++;
if (image_operands & uint32_t(spv::ImageOperandsMask::Grad))
offset_operand_index += 2;
assert(((image_operands &
uint32_t(spv::ImageOperandsMask::ConstOffset)) == 0) &&
"Offset and ConstOffset may not be used together");
if (offset_operand_index < inst->NumOperands()) {
if (constants[offset_operand_index]) {
if (constants[offset_operand_index]->IsZero()) {
inst->RemoveInOperand(offset_operand_index);
} else {
image_operands = image_operands |
uint32_t(spv::ImageOperandsMask::ConstOffset);
}
image_operands =
image_operands & ~uint32_t(spv::ImageOperandsMask::Offset);
inst->SetInOperand(operand_index, {image_operands});
return true;
}
}
}
}
return false;
};
}
} // namespace
void FoldingRules::AddFoldingRules() {
// Add all folding rules to the list for the opcodes to which they apply.
// Note that the order in which rules are added to the list matters. If a rule
// applies to the instruction, the rest of the rules will not be attempted.
// Take that into consideration.
rules_[spv::Op::OpBitcast].push_back(BitCastScalarOrVector());
rules_[spv::Op::OpCompositeConstruct].push_back(
CompositeExtractFeedingConstruct);
rules_[spv::Op::OpCompositeExtract].push_back(InsertFeedingExtract());
rules_[spv::Op::OpCompositeExtract].push_back(
CompositeConstructFeedingExtract);
rules_[spv::Op::OpCompositeExtract].push_back(VectorShuffleFeedingExtract());
rules_[spv::Op::OpCompositeExtract].push_back(FMixFeedingExtract());
rules_[spv::Op::OpCompositeInsert].push_back(
CompositeInsertToCompositeConstruct);
rules_[spv::Op::OpDot].push_back(DotProductDoingExtract());
rules_[spv::Op::OpEntryPoint].push_back(RemoveRedundantOperands());
rules_[spv::Op::OpFAdd].push_back(RedundantFAdd());
rules_[spv::Op::OpFAdd].push_back(MergeAddNegateArithmetic());
rules_[spv::Op::OpFAdd].push_back(MergeAddAddArithmetic());
rules_[spv::Op::OpFAdd].push_back(MergeAddSubArithmetic());
rules_[spv::Op::OpFAdd].push_back(MergeGenericAddSubArithmetic());
rules_[spv::Op::OpFAdd].push_back(FactorAddMuls());
rules_[spv::Op::OpFAdd].push_back(MergeMulAddArithmetic);
rules_[spv::Op::OpFDiv].push_back(RedundantFDiv());
rules_[spv::Op::OpFDiv].push_back(ReciprocalFDiv());
rules_[spv::Op::OpFDiv].push_back(MergeDivDivArithmetic());
rules_[spv::Op::OpFDiv].push_back(MergeDivMulArithmetic());
rules_[spv::Op::OpFDiv].push_back(MergeDivNegateArithmetic());
rules_[spv::Op::OpFMul].push_back(RedundantFMul());
rules_[spv::Op::OpFMul].push_back(MergeMulMulArithmetic());
rules_[spv::Op::OpFMul].push_back(MergeMulDivArithmetic());
rules_[spv::Op::OpFMul].push_back(MergeMulNegateArithmetic());
rules_[spv::Op::OpFNegate].push_back(MergeNegateArithmetic());
rules_[spv::Op::OpFNegate].push_back(MergeNegateAddSubArithmetic());
rules_[spv::Op::OpFNegate].push_back(MergeNegateMulDivArithmetic());
rules_[spv::Op::OpFSub].push_back(RedundantFSub());
rules_[spv::Op::OpFSub].push_back(MergeSubNegateArithmetic());
rules_[spv::Op::OpFSub].push_back(MergeSubAddArithmetic());
rules_[spv::Op::OpFSub].push_back(MergeSubSubArithmetic());
rules_[spv::Op::OpFSub].push_back(MergeMulSubArithmetic);
rules_[spv::Op::OpIAdd].push_back(RedundantIAdd());
rules_[spv::Op::OpIAdd].push_back(MergeAddNegateArithmetic());
rules_[spv::Op::OpIAdd].push_back(MergeAddAddArithmetic());
rules_[spv::Op::OpIAdd].push_back(MergeAddSubArithmetic());
rules_[spv::Op::OpIAdd].push_back(MergeGenericAddSubArithmetic());
rules_[spv::Op::OpIAdd].push_back(FactorAddMuls());
rules_[spv::Op::OpIMul].push_back(IntMultipleBy1());
rules_[spv::Op::OpIMul].push_back(MergeMulMulArithmetic());
rules_[spv::Op::OpIMul].push_back(MergeMulNegateArithmetic());
rules_[spv::Op::OpISub].push_back(MergeSubNegateArithmetic());
rules_[spv::Op::OpISub].push_back(MergeSubAddArithmetic());
rules_[spv::Op::OpISub].push_back(MergeSubSubArithmetic());
rules_[spv::Op::OpPhi].push_back(RedundantPhi());
rules_[spv::Op::OpSNegate].push_back(MergeNegateArithmetic());
rules_[spv::Op::OpSNegate].push_back(MergeNegateMulDivArithmetic());
rules_[spv::Op::OpSNegate].push_back(MergeNegateAddSubArithmetic());
rules_[spv::Op::OpSelect].push_back(RedundantSelect());
rules_[spv::Op::OpStore].push_back(StoringUndef());
rules_[spv::Op::OpVectorShuffle].push_back(VectorShuffleFeedingShuffle());
rules_[spv::Op::OpImageSampleImplicitLod].push_back(UpdateImageOperands());
rules_[spv::Op::OpImageSampleExplicitLod].push_back(UpdateImageOperands());
rules_[spv::Op::OpImageSampleDrefImplicitLod].push_back(
UpdateImageOperands());
rules_[spv::Op::OpImageSampleDrefExplicitLod].push_back(
UpdateImageOperands());
rules_[spv::Op::OpImageSampleProjImplicitLod].push_back(
UpdateImageOperands());
rules_[spv::Op::OpImageSampleProjExplicitLod].push_back(
UpdateImageOperands());
rules_[spv::Op::OpImageSampleProjDrefImplicitLod].push_back(
UpdateImageOperands());
rules_[spv::Op::OpImageSampleProjDrefExplicitLod].push_back(
UpdateImageOperands());
rules_[spv::Op::OpImageFetch].push_back(UpdateImageOperands());
rules_[spv::Op::OpImageGather].push_back(UpdateImageOperands());
rules_[spv::Op::OpImageDrefGather].push_back(UpdateImageOperands());
rules_[spv::Op::OpImageRead].push_back(UpdateImageOperands());
rules_[spv::Op::OpImageWrite].push_back(UpdateImageOperands());
rules_[spv::Op::OpImageSparseSampleImplicitLod].push_back(
UpdateImageOperands());
rules_[spv::Op::OpImageSparseSampleExplicitLod].push_back(
UpdateImageOperands());
rules_[spv::Op::OpImageSparseSampleDrefImplicitLod].push_back(
UpdateImageOperands());
rules_[spv::Op::OpImageSparseSampleDrefExplicitLod].push_back(
UpdateImageOperands());
rules_[spv::Op::OpImageSparseSampleProjImplicitLod].push_back(
UpdateImageOperands());
rules_[spv::Op::OpImageSparseSampleProjExplicitLod].push_back(
UpdateImageOperands());
rules_[spv::Op::OpImageSparseSampleProjDrefImplicitLod].push_back(
UpdateImageOperands());
rules_[spv::Op::OpImageSparseSampleProjDrefExplicitLod].push_back(
UpdateImageOperands());
rules_[spv::Op::OpImageSparseFetch].push_back(UpdateImageOperands());
rules_[spv::Op::OpImageSparseGather].push_back(UpdateImageOperands());
rules_[spv::Op::OpImageSparseDrefGather].push_back(UpdateImageOperands());
rules_[spv::Op::OpImageSparseRead].push_back(UpdateImageOperands());
FeatureManager* feature_manager = context_->get_feature_mgr();
// Add rules for GLSLstd450
uint32_t ext_inst_glslstd450_id =
feature_manager->GetExtInstImportId_GLSLstd450();
if (ext_inst_glslstd450_id != 0) {
ext_rules_[{ext_inst_glslstd450_id, GLSLstd450FMix}].push_back(
RedundantFMix());
}
}
} // namespace opt
} // namespace spvtools
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