mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-23 20:20:06 +00:00
efc5061929
Remove the CFG requirement when querying a dominator/post-dominator from an IRContext. Updated all uses of the function and tests.
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
// Copyright (c) 2017 Google Inc.
|
|
//
|
|
// 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 "redundancy_elimination.h"
|
|
|
|
#include "value_number_table.h"
|
|
|
|
namespace spvtools {
|
|
namespace opt {
|
|
|
|
Pass::Status RedundancyEliminationPass::Process(ir::IRContext* c) {
|
|
InitializeProcessing(c);
|
|
|
|
bool modified = false;
|
|
ValueNumberTable vnTable(context());
|
|
|
|
for (auto& func : *get_module()) {
|
|
// Build the dominator tree for this function. It is how the code is
|
|
// traversed.
|
|
opt::DominatorTree& dom_tree =
|
|
context()->GetDominatorAnalysis(&func)->GetDomTree();
|
|
|
|
// Keeps track of all ids that contain a given value number. We keep
|
|
// track of multiple values because they could have the same value, but
|
|
// different decorations.
|
|
std::map<uint32_t, uint32_t> value_to_ids;
|
|
|
|
if (EliminateRedundanciesFrom(dom_tree.GetRoot(), vnTable, value_to_ids)) {
|
|
modified = true;
|
|
}
|
|
}
|
|
return (modified ? Status::SuccessWithChange : Status::SuccessWithoutChange);
|
|
}
|
|
|
|
bool RedundancyEliminationPass::EliminateRedundanciesFrom(
|
|
DominatorTreeNode* bb, const ValueNumberTable& vnTable,
|
|
std::map<uint32_t, uint32_t> value_to_ids) {
|
|
bool modified = EliminateRedundanciesInBB(bb->bb_, vnTable, &value_to_ids);
|
|
|
|
for (auto dominated_bb : bb->children_) {
|
|
modified |= EliminateRedundanciesFrom(dominated_bb, vnTable, value_to_ids);
|
|
}
|
|
|
|
return modified;
|
|
}
|
|
} // namespace opt
|
|
} // namespace spvtools
|