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