LCOV - code coverage report
Current view: top level - lib/CodeGen - PreISelIntrinsicLowering.cpp (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 32 33 97.0 %
Date: 2017-09-14 15:23:50 Functions: 8 9 88.9 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===-- PreISelIntrinsicLowering.cpp - Pre-ISel intrinsic lowering pass ---===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : // This pass implements IR lowering for the llvm.load.relative intrinsic.
      11             : //
      12             : //===----------------------------------------------------------------------===//
      13             : 
      14             : #include "llvm/CodeGen/PreISelIntrinsicLowering.h"
      15             : #include "llvm/CodeGen/Passes.h"
      16             : #include "llvm/IR/Function.h"
      17             : #include "llvm/IR/IRBuilder.h"
      18             : #include "llvm/IR/Instructions.h"
      19             : #include "llvm/IR/Intrinsics.h"
      20             : #include "llvm/IR/Module.h"
      21             : #include "llvm/Pass.h"
      22             : 
      23             : using namespace llvm;
      24             : 
      25             : namespace {
      26             : 
      27           4 : bool lowerLoadRelative(Function &F) {
      28           8 :   if (F.use_empty())
      29             :     return false;
      30             : 
      31           4 :   bool Changed = false;
      32           4 :   Type *Int32Ty = Type::getInt32Ty(F.getContext());
      33           4 :   Type *Int32PtrTy = Int32Ty->getPointerTo();
      34           4 :   Type *Int8Ty = Type::getInt8Ty(F.getContext());
      35             : 
      36          20 :   for (auto I = F.use_begin(), E = F.use_end(); I != E;) {
      37           8 :     auto CI = dyn_cast<CallInst>(I->getUser());
      38           4 :     ++I;
      39           8 :     if (!CI || CI->getCalledValue() != &F)
      40           0 :       continue;
      41             : 
      42           8 :     IRBuilder<> B(CI);
      43             :     Value *OffsetPtr =
      44          12 :         B.CreateGEP(Int8Ty, CI->getArgOperand(0), CI->getArgOperand(1));
      45           8 :     Value *OffsetPtrI32 = B.CreateBitCast(OffsetPtr, Int32PtrTy);
      46           8 :     Value *OffsetI32 = B.CreateAlignedLoad(OffsetPtrI32, 4);
      47             : 
      48           8 :     Value *ResultPtr = B.CreateGEP(Int8Ty, CI->getArgOperand(0), OffsetI32);
      49             : 
      50           4 :     CI->replaceAllUsesWith(ResultPtr);
      51           4 :     CI->eraseFromParent();
      52           4 :     Changed = true;
      53             :   }
      54             : 
      55             :   return Changed;
      56             : }
      57             : 
      58       16889 : bool lowerIntrinsics(Module &M) {
      59       16889 :   bool Changed = false;
      60      230184 :   for (Function &F : M) {
      61      359030 :     if (F.getName().startswith("llvm.load.relative."))
      62           4 :       Changed |= lowerLoadRelative(F);
      63             :   }
      64       16889 :   return Changed;
      65             : }
      66             : 
      67       16821 : class PreISelIntrinsicLoweringLegacyPass : public ModulePass {
      68             : public:
      69             :   static char ID;
      70       33848 :   PreISelIntrinsicLoweringLegacyPass() : ModulePass(ID) {}
      71             : 
      72       16888 :   bool runOnModule(Module &M) { return lowerIntrinsics(M); }
      73             : };
      74             : 
      75             : char PreISelIntrinsicLoweringLegacyPass::ID;
      76             : }
      77             : 
      78      191385 : INITIALIZE_PASS(PreISelIntrinsicLoweringLegacyPass,
      79             :                 "pre-isel-intrinsic-lowering", "Pre-ISel Intrinsic Lowering",
      80             :                 false, false)
      81             : 
      82             : namespace llvm {
      83       16923 : ModulePass *createPreISelIntrinsicLoweringPass() {
      84       33846 :   return new PreISelIntrinsicLoweringLegacyPass;
      85             : }
      86             : 
      87           1 : PreservedAnalyses PreISelIntrinsicLoweringPass::run(Module &M,
      88             :                                                     ModuleAnalysisManager &AM) {
      89           1 :   if (!lowerIntrinsics(M))
      90             :     return PreservedAnalyses::all();
      91             :   else
      92             :     return PreservedAnalyses::none();
      93             : }
      94             : } // End llvm namespace

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