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d849f468b0
The definition of the DivergenceAnalysis pass was in a CPP file and wasn't accessible to users of the analysis to get it through "getAnalysis<>()". This patch extracts the definition into a separate header that can be used by users of the analysis to fetch the results. Patch by Volkan Keles (vkeles@apple.com) llvm-svn: 248186
49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
//===- llvm/Analysis/DivergenceAnalysis.h - Divergence Analysis -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// The divergence analysis is an LLVM pass which can be used to find out
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// if a branch instruction in a GPU program is divergent or not. It can help
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// branch optimizations such as jump threading and loop unswitching to make
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// better decisions.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/IR/Function.h"
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#include "llvm/Pass.h"
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namespace llvm {
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class Value;
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class DivergenceAnalysis : public FunctionPass {
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public:
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static char ID;
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DivergenceAnalysis() : FunctionPass(ID) {
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initializeDivergenceAnalysisPass(*PassRegistry::getPassRegistry());
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override;
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bool runOnFunction(Function &F) override;
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// Print all divergent branches in the function.
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void print(raw_ostream &OS, const Module *) const override;
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// Returns true if V is divergent.
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bool isDivergent(const Value *V) const { return DivergentValues.count(V); }
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// Returns true if V is uniform/non-divergent.
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bool isUniform(const Value *V) const { return !isDivergent(V); }
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private:
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// Stores all divergent values.
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DenseSet<const Value *> DivergentValues;
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};
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} // End llvm namespace
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