SPIRV-Tools/source/reduce/reduction_util.cpp
Paul Thomson feb1549213
reduce: add large tests and fix (#2947)
* Add larger reducer tests. 
* Fix conditional_branch_to_simple_conditional_branch_opportunity pass.
2019-10-10 17:12:42 +01:00

66 lines
2.3 KiB
C++

// 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/reduce/reduction_util.h"
#include "source/opt/ir_context.h"
namespace spvtools {
namespace reduce {
using opt::IRContext;
using opt::Instruction;
const uint32_t kTrueBranchOperandIndex = 1;
const uint32_t kFalseBranchOperandIndex = 2;
uint32_t FindOrCreateGlobalUndef(IRContext* context, uint32_t type_id) {
for (auto& inst : context->module()->types_values()) {
if (inst.opcode() != SpvOpUndef) {
continue;
}
if (inst.type_id() == type_id) {
return inst.result_id();
}
}
// TODO(2182): this is adapted from MemPass::Type2Undef. In due course it
// would be good to factor out this duplication.
const uint32_t undef_id = context->TakeNextId();
std::unique_ptr<Instruction> undef_inst(
new Instruction(context, SpvOpUndef, type_id, undef_id, {}));
assert(undef_id == undef_inst->result_id());
context->module()->AddGlobalValue(std::move(undef_inst));
return undef_id;
}
void AdaptPhiInstructionsForRemovedEdge(uint32_t from_id,
opt::BasicBlock* to_block) {
to_block->ForEachPhiInst([&from_id](Instruction* phi_inst) {
Instruction::OperandList new_in_operands;
// Go through the OpPhi's input operands in (variable, parent) pairs.
for (uint32_t index = 0; index < phi_inst->NumInOperands(); index += 2) {
// Keep all pairs where the parent is not the block from which the edge
// is being removed.
if (phi_inst->GetInOperand(index + 1).words[0] != from_id) {
new_in_operands.push_back(phi_inst->GetInOperand(index));
new_in_operands.push_back(phi_inst->GetInOperand(index + 1));
}
}
phi_inst->SetInOperands(std::move(new_in_operands));
});
}
} // namespace reduce
} // namespace spvtools