mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-10-18 19:20:05 +00:00
94bec26afe
Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
47 lines
1.4 KiB
C++
47 lines
1.4 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.
|
|
|
|
// This file implements a pass to cleanup the CFG to remove superfluous
|
|
// constructs (e.g., unreachable basic blocks, empty control flow structures,
|
|
// etc)
|
|
|
|
#include <queue>
|
|
#include <unordered_set>
|
|
|
|
#include "cfg_cleanup_pass.h"
|
|
|
|
#include "function.h"
|
|
#include "module.h"
|
|
|
|
namespace spvtools {
|
|
namespace opt {
|
|
|
|
void CFGCleanupPass::Initialize(ir::Module* module) {
|
|
InitializeProcessing(module);
|
|
InitializeCFGCleanup(module);
|
|
}
|
|
|
|
Pass::Status CFGCleanupPass::Process(ir::Module* module) {
|
|
Initialize(module);
|
|
|
|
// Process all entry point functions.
|
|
ProcessFunction pfn = [this](ir::Function* fp) { return CFGCleanup(fp); };
|
|
bool modified = ProcessReachableCallTree(pfn, module);
|
|
return modified ? Pass::Status::SuccessWithChange
|
|
: Pass::Status::SuccessWithoutChange;
|
|
}
|
|
|
|
} // namespace opt
|
|
} // namespace spvtools
|