mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-25 04:50:04 +00:00
5d2bc6f064
Fixes #5121 * If the non-semantic info instructions depended on other moved instructions the def/use manager would get corrupted.
69 lines
2.5 KiB
C++
69 lines
2.5 KiB
C++
// Copyright (c) 2019 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 "eliminate_dead_functions_util.h"
|
|
|
|
namespace spvtools {
|
|
namespace opt {
|
|
|
|
namespace eliminatedeadfunctionsutil {
|
|
|
|
Module::iterator EliminateFunction(IRContext* context,
|
|
Module::iterator* func_iter) {
|
|
bool first_func = *func_iter == context->module()->begin();
|
|
bool seen_func_end = false;
|
|
std::unordered_set<Instruction*> to_kill;
|
|
(*func_iter)
|
|
->ForEachInst(
|
|
[context, first_func, func_iter, &seen_func_end,
|
|
&to_kill](Instruction* inst) {
|
|
if (inst->opcode() == spv::Op::OpFunctionEnd) {
|
|
seen_func_end = true;
|
|
}
|
|
// Move non-semantic instructions to the previous function or
|
|
// global values if this is the first function.
|
|
if (seen_func_end && inst->opcode() == spv::Op::OpExtInst) {
|
|
assert(inst->IsNonSemanticInstruction());
|
|
if (to_kill.find(inst) != to_kill.end()) return;
|
|
std::unique_ptr<Instruction> clone(inst->Clone(context));
|
|
// Clear uses of "inst" to in case this moves a dependent chain of
|
|
// instructions.
|
|
context->get_def_use_mgr()->ClearInst(inst);
|
|
context->AnalyzeDefUse(clone.get());
|
|
if (first_func) {
|
|
context->AddGlobalValue(std::move(clone));
|
|
} else {
|
|
auto prev_func_iter = *func_iter;
|
|
--prev_func_iter;
|
|
prev_func_iter->AddNonSemanticInstruction(std::move(clone));
|
|
}
|
|
inst->ToNop();
|
|
} else if (to_kill.find(inst) == to_kill.end()) {
|
|
context->CollectNonSemanticTree(inst, &to_kill);
|
|
context->KillInst(inst);
|
|
}
|
|
},
|
|
true, true);
|
|
|
|
for (auto* dead : to_kill) {
|
|
context->KillInst(dead);
|
|
}
|
|
|
|
return func_iter->Erase();
|
|
}
|
|
|
|
} // namespace eliminatedeadfunctionsutil
|
|
} // namespace opt
|
|
} // namespace spvtools
|