95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
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//===-- PreISelIntrinsicLowering.cpp - Pre-ISel intrinsic lowering pass ---===//
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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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// This pass implements IR lowering for the llvm.load.relative intrinsic.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/PreISelIntrinsicLowering.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Pass.h"
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using namespace llvm;
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namespace {
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bool lowerLoadRelative(Function &F) {
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if (F.use_empty())
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return false;
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bool Changed = false;
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Type *Int32Ty = Type::getInt32Ty(F.getContext());
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Type *Int32PtrTy = Int32Ty->getPointerTo();
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Type *Int8Ty = Type::getInt8Ty(F.getContext());
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for (auto I = F.use_begin(), E = F.use_end(); I != E;) {
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auto CI = dyn_cast<CallInst>(I->getUser());
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++I;
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if (!CI || CI->getCalledValue() != &F)
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continue;
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IRBuilder<> B(CI);
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Value *OffsetPtr =
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B.CreateGEP(Int8Ty, CI->getArgOperand(0), CI->getArgOperand(1));
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Value *OffsetPtrI32 = B.CreateBitCast(OffsetPtr, Int32PtrTy);
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Value *OffsetI32 = B.CreateAlignedLoad(OffsetPtrI32, 4);
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Value *ResultPtr = B.CreateGEP(Int8Ty, CI->getArgOperand(0), OffsetI32);
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CI->replaceAllUsesWith(ResultPtr);
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CI->eraseFromParent();
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Changed = true;
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}
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return Changed;
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}
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bool lowerIntrinsics(Module &M) {
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bool Changed = false;
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for (Function &F : M) {
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if (F.getName().startswith("llvm.load.relative."))
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Changed |= lowerLoadRelative(F);
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}
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return Changed;
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}
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class PreISelIntrinsicLoweringLegacyPass : public ModulePass {
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public:
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static char ID;
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PreISelIntrinsicLoweringLegacyPass() : ModulePass(ID) {}
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bool runOnModule(Module &M) { return lowerIntrinsics(M); }
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};
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char PreISelIntrinsicLoweringLegacyPass::ID;
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}
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INITIALIZE_PASS(PreISelIntrinsicLoweringLegacyPass,
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"pre-isel-intrinsic-lowering", "Pre-ISel Intrinsic Lowering",
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false, false)
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namespace llvm {
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ModulePass *createPreISelIntrinsicLoweringPass() {
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return new PreISelIntrinsicLoweringLegacyPass;
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}
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PreservedAnalyses PreISelIntrinsicLoweringPass::run(Module &M,
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ModuleAnalysisManager &AM) {
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if (!lowerIntrinsics(M))
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return PreservedAnalyses::all();
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else
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return PreservedAnalyses::none();
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}
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} // End llvm namespace
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