SPIRV-Tools/source/opcode.cpp

780 lines
22 KiB
C++

// Copyright (c) 2015-2022 The Khronos Group Inc.
// Modifications Copyright (C) 2020 Advanced Micro Devices, Inc. All rights
// reserved.
//
// 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/opcode.h"
#include <assert.h>
#include <string.h>
#include <algorithm>
#include <cstdlib>
#include "source/instruction.h"
#include "source/macro.h"
#include "source/spirv_constant.h"
#include "source/spirv_endian.h"
#include "source/spirv_target_env.h"
#include "spirv-tools/libspirv.h"
namespace {
struct OpcodeDescPtrLen {
const spv_opcode_desc_t* ptr;
uint32_t len;
};
#include "core.insts-unified1.inc"
static const spv_opcode_table_t kOpcodeTable = {ARRAY_SIZE(kOpcodeTableEntries),
kOpcodeTableEntries};
// Represents a vendor tool entry in the SPIR-V XML Registry.
struct VendorTool {
uint32_t value;
const char* vendor;
const char* tool; // Might be empty string.
const char* vendor_tool; // Combination of vendor and tool.
};
const VendorTool vendor_tools[] = {
#include "generators.inc"
};
} // anonymous namespace
// TODO(dneto): Move this to another file. It doesn't belong with opcode
// processing.
const char* spvGeneratorStr(uint32_t generator) {
auto where = std::find_if(
std::begin(vendor_tools), std::end(vendor_tools),
[generator](const VendorTool& vt) { return generator == vt.value; });
if (where != std::end(vendor_tools)) return where->vendor_tool;
return "Unknown";
}
uint32_t spvOpcodeMake(uint16_t wordCount, SpvOp opcode) {
return ((uint32_t)opcode) | (((uint32_t)wordCount) << 16);
}
void spvOpcodeSplit(const uint32_t word, uint16_t* pWordCount,
uint16_t* pOpcode) {
if (pWordCount) {
*pWordCount = (uint16_t)((0xffff0000 & word) >> 16);
}
if (pOpcode) {
*pOpcode = 0x0000ffff & word;
}
}
spv_result_t spvOpcodeTableGet(spv_opcode_table* pInstTable, spv_target_env) {
if (!pInstTable) return SPV_ERROR_INVALID_POINTER;
// Descriptions of each opcode. Each entry describes the format of the
// instruction that follows a particular opcode.
*pInstTable = &kOpcodeTable;
return SPV_SUCCESS;
}
spv_result_t spvOpcodeTableNameLookup(spv_target_env env,
const spv_opcode_table table,
const char* name,
spv_opcode_desc* pEntry) {
if (!name || !pEntry) return SPV_ERROR_INVALID_POINTER;
if (!table) return SPV_ERROR_INVALID_TABLE;
// TODO: This lookup of the Opcode table is suboptimal! Binary sort would be
// preferable but the table requires sorting on the Opcode name, but it's
// static const initialized and matches the order of the spec.
const size_t nameLength = strlen(name);
const auto version = spvVersionForTargetEnv(env);
for (uint64_t opcodeIndex = 0; opcodeIndex < table->count; ++opcodeIndex) {
const spv_opcode_desc_t& entry = table->entries[opcodeIndex];
// We considers the current opcode as available as long as
// 1. The target environment satisfies the minimal requirement of the
// opcode; or
// 2. There is at least one extension enabling this opcode.
//
// Note that the second rule assumes the extension enabling this instruction
// is indeed requested in the SPIR-V code; checking that should be
// validator's work.
if (((version >= entry.minVersion && version <= entry.lastVersion) ||
entry.numExtensions > 0u || entry.numCapabilities > 0u) &&
nameLength == strlen(entry.name) &&
!strncmp(name, entry.name, nameLength)) {
// NOTE: Found out Opcode!
*pEntry = &entry;
return SPV_SUCCESS;
}
}
return SPV_ERROR_INVALID_LOOKUP;
}
spv_result_t spvOpcodeTableValueLookup(spv_target_env env,
const spv_opcode_table table,
const SpvOp opcode,
spv_opcode_desc* pEntry) {
if (!table) return SPV_ERROR_INVALID_TABLE;
if (!pEntry) return SPV_ERROR_INVALID_POINTER;
const auto beg = table->entries;
const auto end = table->entries + table->count;
spv_opcode_desc_t needle = {"", opcode, 0, nullptr, 0, {},
false, false, 0, nullptr, ~0u, ~0u};
auto comp = [](const spv_opcode_desc_t& lhs, const spv_opcode_desc_t& rhs) {
return lhs.opcode < rhs.opcode;
};
// We need to loop here because there can exist multiple symbols for the same
// opcode value, and they can be introduced in different target environments,
// which means they can have different minimal version requirements.
// Assumes the underlying table is already sorted ascendingly according to
// opcode value.
const auto version = spvVersionForTargetEnv(env);
for (auto it = std::lower_bound(beg, end, needle, comp);
it != end && it->opcode == opcode; ++it) {
// We considers the current opcode as available as long as
// 1. The target environment satisfies the minimal requirement of the
// opcode; or
// 2. There is at least one extension enabling this opcode.
//
// Note that the second rule assumes the extension enabling this instruction
// is indeed requested in the SPIR-V code; checking that should be
// validator's work.
if ((version >= it->minVersion && version <= it->lastVersion) ||
it->numExtensions > 0u || it->numCapabilities > 0u) {
*pEntry = it;
return SPV_SUCCESS;
}
}
return SPV_ERROR_INVALID_LOOKUP;
}
void spvInstructionCopy(const uint32_t* words, const SpvOp opcode,
const uint16_t wordCount, const spv_endianness_t endian,
spv_instruction_t* pInst) {
pInst->opcode = opcode;
pInst->words.resize(wordCount);
for (uint16_t wordIndex = 0; wordIndex < wordCount; ++wordIndex) {
pInst->words[wordIndex] = spvFixWord(words[wordIndex], endian);
if (!wordIndex) {
uint16_t thisWordCount;
uint16_t thisOpcode;
spvOpcodeSplit(pInst->words[wordIndex], &thisWordCount, &thisOpcode);
assert(opcode == static_cast<SpvOp>(thisOpcode) &&
wordCount == thisWordCount && "Endianness failed!");
}
}
}
const char* spvOpcodeString(const uint32_t opcode) {
const auto beg = kOpcodeTableEntries;
const auto end = kOpcodeTableEntries + ARRAY_SIZE(kOpcodeTableEntries);
spv_opcode_desc_t needle = {"", static_cast<SpvOp>(opcode),
0, nullptr,
0, {},
false, false,
0, nullptr,
~0u, ~0u};
auto comp = [](const spv_opcode_desc_t& lhs, const spv_opcode_desc_t& rhs) {
return lhs.opcode < rhs.opcode;
};
auto it = std::lower_bound(beg, end, needle, comp);
if (it != end && it->opcode == opcode) {
return it->name;
}
assert(0 && "Unreachable!");
return "unknown";
}
int32_t spvOpcodeIsScalarType(const SpvOp opcode) {
switch (opcode) {
case SpvOpTypeInt:
case SpvOpTypeFloat:
case SpvOpTypeBool:
return true;
default:
return false;
}
}
int32_t spvOpcodeIsSpecConstant(const SpvOp opcode) {
switch (opcode) {
case SpvOpSpecConstantTrue:
case SpvOpSpecConstantFalse:
case SpvOpSpecConstant:
case SpvOpSpecConstantComposite:
case SpvOpSpecConstantOp:
return true;
default:
return false;
}
}
int32_t spvOpcodeIsConstant(const SpvOp opcode) {
switch (opcode) {
case SpvOpConstantTrue:
case SpvOpConstantFalse:
case SpvOpConstant:
case SpvOpConstantComposite:
case SpvOpConstantSampler:
case SpvOpConstantNull:
case SpvOpSpecConstantTrue:
case SpvOpSpecConstantFalse:
case SpvOpSpecConstant:
case SpvOpSpecConstantComposite:
case SpvOpSpecConstantOp:
return true;
default:
return false;
}
}
bool spvOpcodeIsConstantOrUndef(const SpvOp opcode) {
return opcode == SpvOpUndef || spvOpcodeIsConstant(opcode);
}
bool spvOpcodeIsScalarSpecConstant(const SpvOp opcode) {
switch (opcode) {
case SpvOpSpecConstantTrue:
case SpvOpSpecConstantFalse:
case SpvOpSpecConstant:
return true;
default:
return false;
}
}
int32_t spvOpcodeIsComposite(const SpvOp opcode) {
switch (opcode) {
case SpvOpTypeVector:
case SpvOpTypeMatrix:
case SpvOpTypeArray:
case SpvOpTypeStruct:
case SpvOpTypeCooperativeMatrixNV:
return true;
default:
return false;
}
}
bool spvOpcodeReturnsLogicalVariablePointer(const SpvOp opcode) {
switch (opcode) {
case SpvOpVariable:
case SpvOpAccessChain:
case SpvOpInBoundsAccessChain:
case SpvOpFunctionParameter:
case SpvOpImageTexelPointer:
case SpvOpCopyObject:
case SpvOpSelect:
case SpvOpPhi:
case SpvOpFunctionCall:
case SpvOpPtrAccessChain:
case SpvOpLoad:
case SpvOpConstantNull:
return true;
default:
return false;
}
}
int32_t spvOpcodeReturnsLogicalPointer(const SpvOp opcode) {
switch (opcode) {
case SpvOpVariable:
case SpvOpAccessChain:
case SpvOpInBoundsAccessChain:
case SpvOpFunctionParameter:
case SpvOpImageTexelPointer:
case SpvOpCopyObject:
return true;
default:
return false;
}
}
int32_t spvOpcodeGeneratesType(SpvOp op) {
switch (op) {
case SpvOpTypeVoid:
case SpvOpTypeBool:
case SpvOpTypeInt:
case SpvOpTypeFloat:
case SpvOpTypeVector:
case SpvOpTypeMatrix:
case SpvOpTypeImage:
case SpvOpTypeSampler:
case SpvOpTypeSampledImage:
case SpvOpTypeArray:
case SpvOpTypeRuntimeArray:
case SpvOpTypeStruct:
case SpvOpTypeOpaque:
case SpvOpTypePointer:
case SpvOpTypeFunction:
case SpvOpTypeEvent:
case SpvOpTypeDeviceEvent:
case SpvOpTypeReserveId:
case SpvOpTypeQueue:
case SpvOpTypePipe:
case SpvOpTypePipeStorage:
case SpvOpTypeNamedBarrier:
case SpvOpTypeAccelerationStructureNV:
case SpvOpTypeCooperativeMatrixNV:
// case SpvOpTypeAccelerationStructureKHR: covered by
// SpvOpTypeAccelerationStructureNV
case SpvOpTypeRayQueryKHR:
return true;
default:
// In particular, OpTypeForwardPointer does not generate a type,
// but declares a storage class for a pointer type generated
// by a different instruction.
break;
}
return 0;
}
bool spvOpcodeIsDecoration(const SpvOp opcode) {
switch (opcode) {
case SpvOpDecorate:
case SpvOpDecorateId:
case SpvOpMemberDecorate:
case SpvOpGroupDecorate:
case SpvOpGroupMemberDecorate:
case SpvOpDecorateStringGOOGLE:
case SpvOpMemberDecorateStringGOOGLE:
return true;
default:
break;
}
return false;
}
bool spvOpcodeIsLoad(const SpvOp opcode) {
switch (opcode) {
case SpvOpLoad:
case SpvOpImageSampleExplicitLod:
case SpvOpImageSampleImplicitLod:
case SpvOpImageSampleDrefImplicitLod:
case SpvOpImageSampleDrefExplicitLod:
case SpvOpImageSampleProjImplicitLod:
case SpvOpImageSampleProjExplicitLod:
case SpvOpImageSampleProjDrefImplicitLod:
case SpvOpImageSampleProjDrefExplicitLod:
case SpvOpImageFetch:
case SpvOpImageGather:
case SpvOpImageDrefGather:
case SpvOpImageRead:
case SpvOpImageSparseSampleImplicitLod:
case SpvOpImageSparseSampleExplicitLod:
case SpvOpImageSparseSampleDrefExplicitLod:
case SpvOpImageSparseSampleDrefImplicitLod:
case SpvOpImageSparseFetch:
case SpvOpImageSparseGather:
case SpvOpImageSparseDrefGather:
case SpvOpImageSparseRead:
return true;
default:
return false;
}
}
bool spvOpcodeIsBranch(SpvOp opcode) {
switch (opcode) {
case SpvOpBranch:
case SpvOpBranchConditional:
case SpvOpSwitch:
return true;
default:
return false;
}
}
bool spvOpcodeIsAtomicWithLoad(const SpvOp opcode) {
switch (opcode) {
case SpvOpAtomicLoad:
case SpvOpAtomicExchange:
case SpvOpAtomicCompareExchange:
case SpvOpAtomicCompareExchangeWeak:
case SpvOpAtomicIIncrement:
case SpvOpAtomicIDecrement:
case SpvOpAtomicIAdd:
case SpvOpAtomicFAddEXT:
case SpvOpAtomicISub:
case SpvOpAtomicSMin:
case SpvOpAtomicUMin:
case SpvOpAtomicFMinEXT:
case SpvOpAtomicSMax:
case SpvOpAtomicUMax:
case SpvOpAtomicFMaxEXT:
case SpvOpAtomicAnd:
case SpvOpAtomicOr:
case SpvOpAtomicXor:
case SpvOpAtomicFlagTestAndSet:
return true;
default:
return false;
}
}
bool spvOpcodeIsAtomicOp(const SpvOp opcode) {
return (spvOpcodeIsAtomicWithLoad(opcode) || opcode == SpvOpAtomicStore ||
opcode == SpvOpAtomicFlagClear);
}
bool spvOpcodeIsReturn(SpvOp opcode) {
switch (opcode) {
case SpvOpReturn:
case SpvOpReturnValue:
return true;
default:
return false;
}
}
bool spvOpcodeIsAbort(SpvOp opcode) {
switch (opcode) {
case SpvOpKill:
case SpvOpUnreachable:
case SpvOpTerminateInvocation:
case SpvOpTerminateRayKHR:
case SpvOpIgnoreIntersectionKHR:
return true;
default:
return false;
}
}
bool spvOpcodeIsReturnOrAbort(SpvOp opcode) {
return spvOpcodeIsReturn(opcode) || spvOpcodeIsAbort(opcode);
}
bool spvOpcodeIsBlockTerminator(SpvOp opcode) {
return spvOpcodeIsBranch(opcode) || spvOpcodeIsReturnOrAbort(opcode);
}
bool spvOpcodeTerminatesExecution(SpvOp opcode) {
switch (opcode) {
case SpvOpKill:
case SpvOpTerminateInvocation:
case SpvOpTerminateRayKHR:
case SpvOpIgnoreIntersectionKHR:
case SpvOpEmitMeshTasksEXT:
return true;
default:
return false;
}
}
bool spvOpcodeIsBaseOpaqueType(SpvOp opcode) {
switch (opcode) {
case SpvOpTypeImage:
case SpvOpTypeSampler:
case SpvOpTypeSampledImage:
case SpvOpTypeOpaque:
case SpvOpTypeEvent:
case SpvOpTypeDeviceEvent:
case SpvOpTypeReserveId:
case SpvOpTypeQueue:
case SpvOpTypePipe:
case SpvOpTypeForwardPointer:
case SpvOpTypePipeStorage:
case SpvOpTypeNamedBarrier:
return true;
default:
return false;
}
}
bool spvOpcodeIsNonUniformGroupOperation(SpvOp opcode) {
switch (opcode) {
case SpvOpGroupNonUniformElect:
case SpvOpGroupNonUniformAll:
case SpvOpGroupNonUniformAny:
case SpvOpGroupNonUniformAllEqual:
case SpvOpGroupNonUniformBroadcast:
case SpvOpGroupNonUniformBroadcastFirst:
case SpvOpGroupNonUniformBallot:
case SpvOpGroupNonUniformInverseBallot:
case SpvOpGroupNonUniformBallotBitExtract:
case SpvOpGroupNonUniformBallotBitCount:
case SpvOpGroupNonUniformBallotFindLSB:
case SpvOpGroupNonUniformBallotFindMSB:
case SpvOpGroupNonUniformShuffle:
case SpvOpGroupNonUniformShuffleXor:
case SpvOpGroupNonUniformShuffleUp:
case SpvOpGroupNonUniformShuffleDown:
case SpvOpGroupNonUniformIAdd:
case SpvOpGroupNonUniformFAdd:
case SpvOpGroupNonUniformIMul:
case SpvOpGroupNonUniformFMul:
case SpvOpGroupNonUniformSMin:
case SpvOpGroupNonUniformUMin:
case SpvOpGroupNonUniformFMin:
case SpvOpGroupNonUniformSMax:
case SpvOpGroupNonUniformUMax:
case SpvOpGroupNonUniformFMax:
case SpvOpGroupNonUniformBitwiseAnd:
case SpvOpGroupNonUniformBitwiseOr:
case SpvOpGroupNonUniformBitwiseXor:
case SpvOpGroupNonUniformLogicalAnd:
case SpvOpGroupNonUniformLogicalOr:
case SpvOpGroupNonUniformLogicalXor:
case SpvOpGroupNonUniformQuadBroadcast:
case SpvOpGroupNonUniformQuadSwap:
case SpvOpGroupNonUniformRotateKHR:
return true;
default:
return false;
}
}
bool spvOpcodeIsScalarizable(SpvOp opcode) {
switch (opcode) {
case SpvOpPhi:
case SpvOpCopyObject:
case SpvOpConvertFToU:
case SpvOpConvertFToS:
case SpvOpConvertSToF:
case SpvOpConvertUToF:
case SpvOpUConvert:
case SpvOpSConvert:
case SpvOpFConvert:
case SpvOpQuantizeToF16:
case SpvOpVectorInsertDynamic:
case SpvOpSNegate:
case SpvOpFNegate:
case SpvOpIAdd:
case SpvOpFAdd:
case SpvOpISub:
case SpvOpFSub:
case SpvOpIMul:
case SpvOpFMul:
case SpvOpUDiv:
case SpvOpSDiv:
case SpvOpFDiv:
case SpvOpUMod:
case SpvOpSRem:
case SpvOpSMod:
case SpvOpFRem:
case SpvOpFMod:
case SpvOpVectorTimesScalar:
case SpvOpIAddCarry:
case SpvOpISubBorrow:
case SpvOpUMulExtended:
case SpvOpSMulExtended:
case SpvOpShiftRightLogical:
case SpvOpShiftRightArithmetic:
case SpvOpShiftLeftLogical:
case SpvOpBitwiseOr:
case SpvOpBitwiseAnd:
case SpvOpNot:
case SpvOpBitFieldInsert:
case SpvOpBitFieldSExtract:
case SpvOpBitFieldUExtract:
case SpvOpBitReverse:
case SpvOpBitCount:
case SpvOpIsNan:
case SpvOpIsInf:
case SpvOpIsFinite:
case SpvOpIsNormal:
case SpvOpSignBitSet:
case SpvOpLessOrGreater:
case SpvOpOrdered:
case SpvOpUnordered:
case SpvOpLogicalEqual:
case SpvOpLogicalNotEqual:
case SpvOpLogicalOr:
case SpvOpLogicalAnd:
case SpvOpLogicalNot:
case SpvOpSelect:
case SpvOpIEqual:
case SpvOpINotEqual:
case SpvOpUGreaterThan:
case SpvOpSGreaterThan:
case SpvOpUGreaterThanEqual:
case SpvOpSGreaterThanEqual:
case SpvOpULessThan:
case SpvOpSLessThan:
case SpvOpULessThanEqual:
case SpvOpSLessThanEqual:
case SpvOpFOrdEqual:
case SpvOpFUnordEqual:
case SpvOpFOrdNotEqual:
case SpvOpFUnordNotEqual:
case SpvOpFOrdLessThan:
case SpvOpFUnordLessThan:
case SpvOpFOrdGreaterThan:
case SpvOpFUnordGreaterThan:
case SpvOpFOrdLessThanEqual:
case SpvOpFUnordLessThanEqual:
case SpvOpFOrdGreaterThanEqual:
case SpvOpFUnordGreaterThanEqual:
return true;
default:
return false;
}
}
bool spvOpcodeIsDebug(SpvOp opcode) {
switch (opcode) {
case SpvOpName:
case SpvOpMemberName:
case SpvOpSource:
case SpvOpSourceContinued:
case SpvOpSourceExtension:
case SpvOpString:
case SpvOpLine:
case SpvOpNoLine:
case SpvOpModuleProcessed:
return true;
default:
return false;
}
}
bool spvOpcodeIsCommutativeBinaryOperator(SpvOp opcode) {
switch (opcode) {
case SpvOpPtrEqual:
case SpvOpPtrNotEqual:
case SpvOpIAdd:
case SpvOpFAdd:
case SpvOpIMul:
case SpvOpFMul:
case SpvOpDot:
case SpvOpIAddCarry:
case SpvOpUMulExtended:
case SpvOpSMulExtended:
case SpvOpBitwiseOr:
case SpvOpBitwiseXor:
case SpvOpBitwiseAnd:
case SpvOpOrdered:
case SpvOpUnordered:
case SpvOpLogicalEqual:
case SpvOpLogicalNotEqual:
case SpvOpLogicalOr:
case SpvOpLogicalAnd:
case SpvOpIEqual:
case SpvOpINotEqual:
case SpvOpFOrdEqual:
case SpvOpFUnordEqual:
case SpvOpFOrdNotEqual:
case SpvOpFUnordNotEqual:
return true;
default:
return false;
}
}
bool spvOpcodeIsLinearAlgebra(SpvOp opcode) {
switch (opcode) {
case SpvOpTranspose:
case SpvOpVectorTimesScalar:
case SpvOpMatrixTimesScalar:
case SpvOpVectorTimesMatrix:
case SpvOpMatrixTimesVector:
case SpvOpMatrixTimesMatrix:
case SpvOpOuterProduct:
case SpvOpDot:
return true;
default:
return false;
}
}
bool spvOpcodeIsImageSample(const SpvOp opcode) {
switch (opcode) {
case SpvOpImageSampleImplicitLod:
case SpvOpImageSampleExplicitLod:
case SpvOpImageSampleDrefImplicitLod:
case SpvOpImageSampleDrefExplicitLod:
case SpvOpImageSampleProjImplicitLod:
case SpvOpImageSampleProjExplicitLod:
case SpvOpImageSampleProjDrefImplicitLod:
case SpvOpImageSampleProjDrefExplicitLod:
case SpvOpImageSparseSampleImplicitLod:
case SpvOpImageSparseSampleExplicitLod:
case SpvOpImageSparseSampleDrefImplicitLod:
case SpvOpImageSparseSampleDrefExplicitLod:
return true;
default:
return false;
}
}
std::vector<uint32_t> spvOpcodeMemorySemanticsOperandIndices(SpvOp opcode) {
switch (opcode) {
case SpvOpMemoryBarrier:
return {1};
case SpvOpAtomicStore:
case SpvOpControlBarrier:
case SpvOpAtomicFlagClear:
case SpvOpMemoryNamedBarrier:
return {2};
case SpvOpAtomicLoad:
case SpvOpAtomicExchange:
case SpvOpAtomicIIncrement:
case SpvOpAtomicIDecrement:
case SpvOpAtomicIAdd:
case SpvOpAtomicFAddEXT:
case SpvOpAtomicISub:
case SpvOpAtomicSMin:
case SpvOpAtomicUMin:
case SpvOpAtomicSMax:
case SpvOpAtomicUMax:
case SpvOpAtomicAnd:
case SpvOpAtomicOr:
case SpvOpAtomicXor:
case SpvOpAtomicFlagTestAndSet:
return {4};
case SpvOpAtomicCompareExchange:
case SpvOpAtomicCompareExchangeWeak:
return {4, 5};
default:
return {};
}
}
bool spvOpcodeIsAccessChain(SpvOp opcode) {
switch (opcode) {
case SpvOpAccessChain:
case SpvOpInBoundsAccessChain:
case SpvOpPtrAccessChain:
case SpvOpInBoundsPtrAccessChain:
return true;
default:
return false;
}
}
bool spvOpcodeIsBit(SpvOp opcode) {
switch (opcode) {
case SpvOpShiftRightLogical:
case SpvOpShiftRightArithmetic:
case SpvOpShiftLeftLogical:
case SpvOpBitwiseOr:
case SpvOpBitwiseXor:
case SpvOpBitwiseAnd:
case SpvOpNot:
case SpvOpBitReverse:
case SpvOpBitCount:
return true;
default:
return false;
}
}