mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-27 13:50:07 +00:00
83228137e1
Re-formatted the source tree with the command:
$ /usr/bin/clang-format -style=file -i \
$(find include source tools test utils -name '*.cpp' -or -name '*.h')
This required a fix to source/val/decoration.h. It was not including
spirv.h, which broke builds when the #include headers were re-ordered by
clang-format.
104 lines
4.0 KiB
C++
104 lines
4.0 KiB
C++
// Copyright (c) 2017 The Khronos Group Inc.
|
|
// Copyright (c) 2017 Valve Corporation
|
|
// Copyright (c) 2017 LunarG 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.
|
|
|
|
#ifndef LIBSPIRV_OPT_LOCAL_SINGLE_BLOCK_ELIM_PASS_H_
|
|
#define LIBSPIRV_OPT_LOCAL_SINGLE_BLOCK_ELIM_PASS_H_
|
|
|
|
#include <algorithm>
|
|
#include <map>
|
|
#include <queue>
|
|
#include <unordered_map>
|
|
#include <unordered_set>
|
|
#include <utility>
|
|
|
|
#include "basic_block.h"
|
|
#include "def_use_manager.h"
|
|
#include "mem_pass.h"
|
|
#include "module.h"
|
|
|
|
namespace spvtools {
|
|
namespace opt {
|
|
|
|
// See optimizer.hpp for documentation.
|
|
class LocalSingleBlockLoadStoreElimPass : public MemPass {
|
|
public:
|
|
LocalSingleBlockLoadStoreElimPass();
|
|
const char* name() const override { return "eliminate-local-single-block"; }
|
|
Status Process(ir::IRContext* c) override;
|
|
|
|
ir::IRContext::Analysis GetPreservedAnalyses() override {
|
|
return ir::IRContext::kAnalysisDefUse;
|
|
}
|
|
|
|
private:
|
|
// Return true if all uses of |varId| are only through supported reference
|
|
// operations ie. loads and store. Also cache in supported_ref_ptrs_.
|
|
// TODO(dnovillo): This function is replicated in other passes and it's
|
|
// slightly different in every pass. Is it possible to make one common
|
|
// implementation?
|
|
bool HasOnlySupportedRefs(uint32_t varId);
|
|
|
|
// On all entry point functions, within each basic block, eliminate
|
|
// loads and stores to function variables where possible. For
|
|
// loads, if previous load or store to same variable, replace
|
|
// load id with previous id and delete load. Finally, check if
|
|
// remaining stores are useless, and delete store and variable
|
|
// where possible. Assumes logical addressing.
|
|
bool LocalSingleBlockLoadStoreElim(ir::Function* func);
|
|
|
|
// Initialize extensions whitelist
|
|
void InitExtensions();
|
|
|
|
// Return true if all extensions in this module are supported by this pass.
|
|
bool AllExtensionsSupported() const;
|
|
|
|
void Initialize(ir::IRContext* c);
|
|
Pass::Status ProcessImpl();
|
|
|
|
// Map from function scope variable to a store of that variable in the
|
|
// current block whose value is currently valid. This map is cleared
|
|
// at the start of each block and incrementally updated as the block
|
|
// is scanned. The stores are candidates for elimination. The map is
|
|
// conservatively cleared when a function call is encountered.
|
|
std::unordered_map<uint32_t, ir::Instruction*> var2store_;
|
|
|
|
// Map from function scope variable to a load of that variable in the
|
|
// current block whose value is currently valid. This map is cleared
|
|
// at the start of each block and incrementally updated as the block
|
|
// is scanned. The stores are candidates for elimination. The map is
|
|
// conservatively cleared when a function call is encountered.
|
|
std::unordered_map<uint32_t, ir::Instruction*> var2load_;
|
|
|
|
// Set of variables whose most recent store in the current block cannot be
|
|
// deleted, for example, if there is a load of the variable which is
|
|
// dependent on the store and is not replaced and deleted by this pass,
|
|
// for example, a load through an access chain. A variable is removed
|
|
// from this set each time a new store of that variable is encountered.
|
|
std::unordered_set<uint32_t> pinned_vars_;
|
|
|
|
// Extensions supported by this pass.
|
|
std::unordered_set<std::string> extensions_whitelist_;
|
|
|
|
// Variables that are only referenced by supported operations for this
|
|
// pass ie. loads and stores.
|
|
std::unordered_set<uint32_t> supported_ref_ptrs_;
|
|
};
|
|
|
|
} // namespace opt
|
|
} // namespace spvtools
|
|
|
|
#endif // LIBSPIRV_OPT_LOCAL_SINGLE_BLOCK_ELIM_PASS_H_
|