mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-28 06:01:04 +00:00
eda2cfbe12
This Cl cleans up the include paths to be relative to the top level directory. Various include-what-you-use fixes have been added.
115 lines
3.8 KiB
C++
115 lines
3.8 KiB
C++
// 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.
|
|
|
|
#ifndef SOURCE_OPT_LOOP_FUSION_H_
|
|
#define SOURCE_OPT_LOOP_FUSION_H_
|
|
|
|
#include <map>
|
|
#include <set>
|
|
#include <utility>
|
|
#include <vector>
|
|
|
|
#include "source/opt/ir_context.h"
|
|
#include "source/opt/loop_descriptor.h"
|
|
#include "source/opt/loop_utils.h"
|
|
#include "source/opt/scalar_analysis.h"
|
|
|
|
namespace spvtools {
|
|
namespace opt {
|
|
|
|
class LoopFusion {
|
|
public:
|
|
LoopFusion(IRContext* context, Loop* loop_0, Loop* loop_1)
|
|
: context_(context),
|
|
loop_0_(loop_0),
|
|
loop_1_(loop_1),
|
|
containing_function_(loop_0->GetHeaderBlock()->GetParent()) {}
|
|
|
|
// Checks if the |loop_0| and |loop_1| are compatible for fusion.
|
|
// That means:
|
|
// * they both have one induction variable
|
|
// * they have the same upper and lower bounds
|
|
// - same inital value
|
|
// - same condition
|
|
// * they have the same update step
|
|
// * they are adjacent, with |loop_0| appearing before |loop_1|
|
|
// * there are no break/continue in either of them
|
|
// * they both have pre-header blocks (required for ScalarEvolutionAnalysis
|
|
// and dependence checking).
|
|
bool AreCompatible();
|
|
|
|
// Checks if compatible |loop_0| and |loop_1| are legal to fuse.
|
|
// * fused loops do not have any dependencies with dependence distance greater
|
|
// than 0 that did not exist in the original loops.
|
|
// * there are no function calls in the loops (could have side-effects)
|
|
bool IsLegal();
|
|
|
|
// Perform the actual fusion of |loop_0_| and |loop_1_|. The loops have to be
|
|
// compatible and the fusion has to be legal.
|
|
void Fuse();
|
|
|
|
private:
|
|
// Check that the initial values are the same.
|
|
bool CheckInit();
|
|
|
|
// Check that the conditions are the same.
|
|
bool CheckCondition();
|
|
|
|
// Check that the steps are the same.
|
|
bool CheckStep();
|
|
|
|
// Returns |true| if |instruction| is used in the continue or condition block
|
|
// of |loop|.
|
|
bool UsedInContinueOrConditionBlock(Instruction* instruction, Loop* loop);
|
|
|
|
// Remove entries in |instructions| that are not used in the continue or
|
|
// condition block of |loop|.
|
|
void RemoveIfNotUsedContinueOrConditionBlock(
|
|
std::vector<Instruction*>* instructions, Loop* loop);
|
|
|
|
// Returns |true| if |instruction| is used in |loop|.
|
|
bool IsUsedInLoop(Instruction* instruction, Loop* loop);
|
|
|
|
// Returns |true| if |loop| has at least one barrier or function call.
|
|
bool ContainsBarriersOrFunctionCalls(Loop* loop);
|
|
|
|
// Get all instructions in the |loop| (except in the latch block) that have
|
|
// the opcode |opcode|.
|
|
std::pair<std::vector<Instruction*>, std::vector<Instruction*>>
|
|
GetLoadsAndStoresInLoop(Loop* loop);
|
|
|
|
// Given a vector of memory operations (OpLoad/OpStore), constructs a map from
|
|
// variables to the loads/stores that those variables.
|
|
std::map<Instruction*, std::vector<Instruction*>> LocationToMemOps(
|
|
const std::vector<Instruction*>& mem_ops);
|
|
|
|
IRContext* context_;
|
|
|
|
// The original loops to be fused.
|
|
Loop* loop_0_;
|
|
Loop* loop_1_;
|
|
|
|
// The function that contains |loop_0_| and |loop_1_|.
|
|
Function* containing_function_ = nullptr;
|
|
|
|
// The induction variables for |loop_0_| and |loop_1_|.
|
|
Instruction* induction_0_ = nullptr;
|
|
Instruction* induction_1_ = nullptr;
|
|
};
|
|
|
|
} // namespace opt
|
|
} // namespace spvtools
|
|
|
|
#endif // SOURCE_OPT_LOOP_FUSION_H_
|