86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
//===-- SPIRVStripConvergentIntrinsics.cpp ----------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This pass trims convergence intrinsics as those were only useful when
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// modifying the CFG during IR passes.
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//
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//===----------------------------------------------------------------------===//
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#include "SPIRV.h"
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#include "SPIRVSubtarget.h"
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#include "SPIRVTargetMachine.h"
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#include "SPIRVUtils.h"
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#include "llvm/CodeGen/IntrinsicLowering.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/IntrinsicsSPIRV.h"
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#include "llvm/Transforms/Utils/Cloning.h"
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#include "llvm/Transforms/Utils/LowerMemIntrinsics.h"
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using namespace llvm;
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namespace llvm {
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void initializeSPIRVStripConvergentIntrinsicsPass(PassRegistry &);
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}
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class SPIRVStripConvergentIntrinsics : public FunctionPass {
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public:
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static char ID;
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SPIRVStripConvergentIntrinsics() : FunctionPass(ID) {
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initializeSPIRVStripConvergentIntrinsicsPass(
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*PassRegistry::getPassRegistry());
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};
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virtual bool runOnFunction(Function &F) override {
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DenseSet<Instruction *> ToRemove;
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for (BasicBlock &BB : F) {
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for (Instruction &I : BB) {
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if (auto *II = dyn_cast<IntrinsicInst>(&I)) {
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if (II->getIntrinsicID() !=
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Intrinsic::experimental_convergence_entry &&
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II->getIntrinsicID() !=
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Intrinsic::experimental_convergence_loop &&
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II->getIntrinsicID() !=
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Intrinsic::experimental_convergence_anchor) {
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continue;
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}
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II->replaceAllUsesWith(UndefValue::get(II->getType()));
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ToRemove.insert(II);
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} else if (auto *CI = dyn_cast<CallInst>(&I)) {
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auto OB = CI->getOperandBundle(LLVMContext::OB_convergencectrl);
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if (!OB.has_value())
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continue;
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auto *NewCall = CallBase::removeOperandBundle(
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CI, LLVMContext::OB_convergencectrl, CI);
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NewCall->copyMetadata(*CI);
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CI->replaceAllUsesWith(NewCall);
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ToRemove.insert(CI);
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}
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}
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}
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// All usages must be removed before their definition is removed.
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for (Instruction *I : ToRemove)
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I->eraseFromParent();
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return ToRemove.size() != 0;
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}
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};
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char SPIRVStripConvergentIntrinsics::ID = 0;
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INITIALIZE_PASS(SPIRVStripConvergentIntrinsics, "strip-convergent-intrinsics",
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"SPIRV strip convergent intrinsics", false, false)
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FunctionPass *llvm::createSPIRVStripConvergenceIntrinsicsPass() {
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return new SPIRVStripConvergentIntrinsics();
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}
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