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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/reduce/operand_to_undef_reduction_opportunity_finder.h"
#include "source/opt/instruction.h"
#include "source/reduce/change_operand_to_undef_reduction_opportunity.h"
namespace spvtools {
namespace reduce {
std::vector<std::unique_ptr<ReductionOpportunity>>
OperandToUndefReductionOpportunityFinder::GetAvailableOpportunities(
opt::IRContext* context, uint32_t target_function) const {
std::vector<std::unique_ptr<ReductionOpportunity>> result;
for (auto* function : GetTargetFunctions(context, target_function)) {
for (auto& block : *function) {
for (auto& inst : block) {
// Skip instructions that result in a pointer type.
auto type_id = inst.type_id();
if (type_id) {
auto type_id_def = context->get_def_use_mgr()->GetDef(type_id);
if (type_id_def->opcode() == spv::Op::OpTypePointer) {
continue;
}
}
// We iterate through the operands using an explicit index (rather
// than using a lambda) so that we use said index in the construction
// of a ChangeOperandToUndefReductionOpportunity
for (uint32_t index = 0; index < inst.NumOperands(); index++) {
const auto& operand = inst.GetOperand(index);
if (spvIsInIdType(operand.type)) {
const auto operand_id = operand.words[0];
auto operand_id_def =
context->get_def_use_mgr()->GetDef(operand_id);
// Skip constant and undef operands.
// We always want the reducer to make the module "smaller", which
// ensures termination.
// Therefore, we assume: id > undef id > constant id.
if (spvOpcodeIsConstantOrUndef(operand_id_def->opcode())) {
continue;
}
// Don't replace function operands with undef.
if (operand_id_def->opcode() == spv::Op::OpFunction) {
continue;
}
// Only consider operands that have a type.
auto operand_type_id = operand_id_def->type_id();
if (operand_type_id) {
auto operand_type_id_def =
context->get_def_use_mgr()->GetDef(operand_type_id);
// Skip pointer operands.
if (operand_type_id_def->opcode() == spv::Op::OpTypePointer) {
continue;
}
result.push_back(
MakeUnique<ChangeOperandToUndefReductionOpportunity>(
context, &inst, index));
}
}
}
}
}
}
return result;
}
std::string OperandToUndefReductionOpportunityFinder::GetName() const {
return "OperandToUndefReductionOpportunityFinder";
}
} // namespace reduce
} // namespace spvtools
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