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/*========================== begin_copyright_notice ============================
Copyright (C) 2018-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
//
/// GenXRawSendRipper
/// -----------------
///
/// This pass tears down a series of raw send chained through the old value
/// operand when it's safe.
//===----------------------------------------------------------------------===//
//
#include "GenX.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Function.h"
#include "llvm/Pass.h"
#include "llvm/Support/raw_ostream.h"
#define DEBUG_TYPE "GENX_RAWSENDRIPPER"
using namespace llvm;
using namespace genx;
namespace {
class GenXRawSendRipper : public FunctionPass {
public:
static char ID;
explicit GenXRawSendRipper() : FunctionPass(ID) {}
StringRef getPassName() const override {
return "GenX RAW send ripper";
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesCFG();
}
bool runOnFunction(Function &F) override;
};
} // End anonymous namespace
namespace llvm {
void initializeGenXRawSendRipperPass(PassRegistry &);
} // End namespace llvm
char GenXRawSendRipper::ID = 0;
INITIALIZE_PASS(GenXRawSendRipper, "GenXRawSendRipper",
"Rip chain of raw send", false, false)
FunctionPass *llvm::createGenXRawSendRipperPass() {
initializeGenXRawSendRipperPass(*PassRegistry::getPassRegistry());
return new GenXRawSendRipper();
}
bool GenXRawSendRipper::runOnFunction(Function &F) {
bool Changed = false;
Value *True = ConstantInt::getTrue(F.getContext());
for (auto &BB : F)
for (auto &I : BB) {
if (GenXIntrinsic::getGenXIntrinsicID(&I) != GenXIntrinsic::genx_raw_send)
continue;
auto II = cast<IntrinsicInst>(&I);
if (II->getOperand(1) != True)
continue;
Value *Old = II->getOperand(5);
if (isa<UndefValue>(Old))
continue;
II->setOperand(5, UndefValue::get(Old->getType()));
}
return Changed;
}
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