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// Header for VariableUniformityAnalysis function pass.
//
// Copyright (c) 2013 Pekka Jääskeläinen / Tampere University of Technology
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#ifndef POCL_VARIABLE_UNIFORMITY_ANALYSIS_H
#define POCL_VARIABLE_UNIFORMITY_ANALYSIS_H
#include "config.h"
#include <llvm/IR/Function.h>
#include <llvm/IR/PassManager.h>
#include <llvm/Pass.h>
#include <llvm/Passes/PassBuilder.h>
namespace llvm {
class Loop;
}
/**
* Analyses the variables in the function to figure out if a variable
* value is
*
* a) 'uniform', i.e., always same for all work-items in the *same work-group*
* b) 'varying', i.e., somehow dependent on the work-item id
*
* For safety, 'variable' is assumed, unless certain of a).
*
* VAU is an "accumulating" pass; it gathers uniformity information of
* instructions in a way that it needs not to be invalidated even though
* the CFG is modified. Thus, in case the semantics of the original
* information does not change, it is safe for passes to set this pass
* preserved even though new instructions are added or the CFG manipulated.
*/
namespace pocl {
class VariableUniformityAnalysisResult;
#if LLVM_MAJOR < MIN_LLVM_NEW_PASSMANAGER
class VariableUniformityAnalysis : public llvm::FunctionPass {
VariableUniformityAnalysisResult *pImpl = nullptr;
public:
static char ID;
VariableUniformityAnalysis() : FunctionPass(ID) {};
bool runOnFunction(llvm::Function &F);
void getAnalysisUsage(llvm::AnalysisUsage &AU) const;
VariableUniformityAnalysisResult &getResult() { return *pImpl; }
~VariableUniformityAnalysis();
};
#else
class VariableUniformityAnalysis
: public llvm::AnalysisInfoMixin<VariableUniformityAnalysis> {
public:
static llvm::AnalysisKey Key;
using Result = VariableUniformityAnalysisResult;
static void registerWithPB(llvm::PassBuilder &PB);
Result run(llvm::Function &F, llvm::FunctionAnalysisManager &AM);
static bool isRequired() { return true; }
};
#endif
} // namespace pocl
#endif
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