mirror of
https://github.com/RPCSX/llvm.git
synced 2024-11-28 14:10:41 +00:00
f3f8fc6a20
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@273713 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
//===-- PreISelIntrinsicLowering.cpp - Pre-ISel intrinsic lowering pass ---===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This pass implements IR lowering for the llvm.load.relative intrinsic.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/CodeGen/PreISelIntrinsicLowering.h"
|
|
#include "llvm/CodeGen/Passes.h"
|
|
#include "llvm/IR/Function.h"
|
|
#include "llvm/IR/IRBuilder.h"
|
|
#include "llvm/IR/Instructions.h"
|
|
#include "llvm/IR/Intrinsics.h"
|
|
#include "llvm/IR/Module.h"
|
|
#include "llvm/Pass.h"
|
|
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
|
|
bool lowerLoadRelative(Function &F) {
|
|
if (F.use_empty())
|
|
return false;
|
|
|
|
bool Changed = false;
|
|
Type *Int32Ty = Type::getInt32Ty(F.getContext());
|
|
Type *Int32PtrTy = Int32Ty->getPointerTo();
|
|
Type *Int8Ty = Type::getInt8Ty(F.getContext());
|
|
|
|
for (auto I = F.use_begin(), E = F.use_end(); I != E;) {
|
|
auto CI = dyn_cast<CallInst>(I->getUser());
|
|
++I;
|
|
if (!CI || CI->getCalledValue() != &F)
|
|
continue;
|
|
|
|
IRBuilder<> B(CI);
|
|
Value *OffsetPtr =
|
|
B.CreateGEP(Int8Ty, CI->getArgOperand(0), CI->getArgOperand(1));
|
|
Value *OffsetPtrI32 = B.CreateBitCast(OffsetPtr, Int32PtrTy);
|
|
Value *OffsetI32 = B.CreateAlignedLoad(OffsetPtrI32, 4);
|
|
|
|
Value *ResultPtr = B.CreateGEP(Int8Ty, CI->getArgOperand(0), OffsetI32);
|
|
|
|
CI->replaceAllUsesWith(ResultPtr);
|
|
CI->eraseFromParent();
|
|
Changed = true;
|
|
}
|
|
|
|
return Changed;
|
|
}
|
|
|
|
bool lowerIntrinsics(Module &M) {
|
|
bool Changed = false;
|
|
for (Function &F : M) {
|
|
if (F.getName().startswith("llvm.load.relative."))
|
|
Changed |= lowerLoadRelative(F);
|
|
}
|
|
return Changed;
|
|
}
|
|
|
|
class PreISelIntrinsicLoweringLegacyPass : public ModulePass {
|
|
public:
|
|
static char ID;
|
|
PreISelIntrinsicLoweringLegacyPass() : ModulePass(ID) {}
|
|
|
|
bool runOnModule(Module &M) { return lowerIntrinsics(M); }
|
|
};
|
|
|
|
char PreISelIntrinsicLoweringLegacyPass::ID;
|
|
}
|
|
|
|
INITIALIZE_PASS(PreISelIntrinsicLoweringLegacyPass,
|
|
"pre-isel-intrinsic-lowering", "Pre-ISel Intrinsic Lowering",
|
|
false, false)
|
|
|
|
namespace llvm {
|
|
ModulePass *createPreISelIntrinsicLoweringPass() {
|
|
return new PreISelIntrinsicLoweringLegacyPass;
|
|
}
|
|
|
|
PreservedAnalyses PreISelIntrinsicLoweringPass::run(Module &M,
|
|
ModuleAnalysisManager &AM) {
|
|
if (!lowerIntrinsics(M))
|
|
return PreservedAnalyses::all();
|
|
else
|
|
return PreservedAnalyses::none();
|
|
}
|
|
} // End llvm namespace
|