85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
//===-- AMDGPUAnnotateUniformValues.cpp - ---------------------------------===//
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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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/// \file
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/// This pass adds amdgpu.uniform metadata to IR values so this information
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/// can be used during instruction selection.
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//
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//===----------------------------------------------------------------------===//
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#include "AMDGPU.h"
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#include "AMDGPUIntrinsicInfo.h"
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#include "llvm/Analysis/DivergenceAnalysis.h"
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#include "llvm/IR/InstVisitor.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#define DEBUG_TYPE "amdgpu-annotate-uniform"
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using namespace llvm;
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namespace {
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class AMDGPUAnnotateUniformValues : public FunctionPass,
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public InstVisitor<AMDGPUAnnotateUniformValues> {
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DivergenceAnalysis *DA;
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public:
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static char ID;
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AMDGPUAnnotateUniformValues() :
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FunctionPass(ID) { }
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bool doInitialization(Module &M) override;
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bool runOnFunction(Function &F) override;
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const char *getPassName() const override { return "AMDGPU Annotate Uniform Values"; }
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequired<DivergenceAnalysis>();
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AU.setPreservesAll();
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}
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void visitLoadInst(LoadInst &I);
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};
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} // End anonymous namespace
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INITIALIZE_PASS_BEGIN(AMDGPUAnnotateUniformValues, DEBUG_TYPE,
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"Add AMDGPU uniform metadata", false, false)
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INITIALIZE_PASS_DEPENDENCY(DivergenceAnalysis)
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INITIALIZE_PASS_END(AMDGPUAnnotateUniformValues, DEBUG_TYPE,
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"Add AMDGPU uniform metadata", false, false)
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char AMDGPUAnnotateUniformValues::ID = 0;
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void AMDGPUAnnotateUniformValues::visitLoadInst(LoadInst &I) {
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Value *Ptr = I.getPointerOperand();
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if (!DA->isUniform(Ptr))
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return;
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if (Instruction *PtrI = dyn_cast<Instruction>(Ptr))
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PtrI->setMetadata("amdgpu.uniform", MDNode::get(I.getContext(), {}));
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}
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bool AMDGPUAnnotateUniformValues::doInitialization(Module &M) {
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return false;
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}
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bool AMDGPUAnnotateUniformValues::runOnFunction(Function &F) {
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DA = &getAnalysis<DivergenceAnalysis>();
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visit(F);
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return true;
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}
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FunctionPass *
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llvm::createAMDGPUAnnotateUniformValues() {
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return new AMDGPUAnnotateUniformValues();
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}
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