LCOV - code coverage report
Current view: top level - lib/CodeGen - PreISelIntrinsicLowering.cpp (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 28 29 96.6 %
Date: 2018-02-20 16:54:40 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/Module.h"
      20             : #include "llvm/IR/Type.h"
      21             : #include "llvm/IR/User.h"
      22             : #include "llvm/Pass.h"
      23             : #include "llvm/Support/Casting.h"
      24             : 
      25             : using namespace llvm;
      26             : 
      27           4 : static bool lowerLoadRelative(Function &F) {
      28           4 :   if (F.use_empty())
      29             :     return false;
      30             : 
      31             :   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           4 :   for (auto I = F.use_begin(), E = F.use_end(); I != E;) {
      37           4 :     auto CI = dyn_cast<CallInst>(I->getUser());
      38             :     ++I;
      39           8 :     if (!CI || CI->getCalledValue() != &F)
      40           0 :       continue;
      41             : 
      42           4 :     IRBuilder<> B(CI);
      43             :     Value *OffsetPtr =
      44           4 :         B.CreateGEP(Int8Ty, CI->getArgOperand(0), CI->getArgOperand(1));
      45           4 :     Value *OffsetPtrI32 = B.CreateBitCast(OffsetPtr, Int32PtrTy);
      46           4 :     Value *OffsetI32 = B.CreateAlignedLoad(OffsetPtrI32, 4);
      47             : 
      48           4 :     Value *ResultPtr = B.CreateGEP(Int8Ty, CI->getArgOperand(0), OffsetI32);
      49             : 
      50           4 :     CI->replaceAllUsesWith(ResultPtr);
      51           4 :     CI->eraseFromParent();
      52             :     Changed = true;
      53             :   }
      54             : 
      55             :   return Changed;
      56             : }
      57             : 
      58       20823 : static bool lowerIntrinsics(Module &M) {
      59             :   bool Changed = false;
      60      277288 :   for (Function &F : M) {
      61      512926 :     if (F.getName().startswith("llvm.load.relative."))
      62           4 :       Changed |= lowerLoadRelative(F);
      63             :   }
      64       20823 :   return Changed;
      65             : }
      66             : 
      67             : namespace {
      68             : 
      69       20799 : class PreISelIntrinsicLoweringLegacyPass : public ModulePass {
      70             : public:
      71             :   static char ID;
      72             : 
      73       20904 :   PreISelIntrinsicLoweringLegacyPass() : ModulePass(ID) {}
      74             : 
      75       20822 :   bool runOnModule(Module &M) override { return lowerIntrinsics(M); }
      76             : };
      77             : 
      78             : } // end anonymous namespace
      79             : 
      80             : char PreISelIntrinsicLoweringLegacyPass::ID;
      81             : 
      82      167408 : INITIALIZE_PASS(PreISelIntrinsicLoweringLegacyPass,
      83             :                 "pre-isel-intrinsic-lowering", "Pre-ISel Intrinsic Lowering",
      84             :                 false, false)
      85             : 
      86       20903 : ModulePass *llvm::createPreISelIntrinsicLoweringPass() {
      87       41806 :   return new PreISelIntrinsicLoweringLegacyPass;
      88             : }
      89             : 
      90           1 : PreservedAnalyses PreISelIntrinsicLoweringPass::run(Module &M,
      91             :                                                     ModuleAnalysisManager &AM) {
      92           1 :   if (!lowerIntrinsics(M))
      93             :     return PreservedAnalyses::all();
      94             :   else
      95             :     return PreservedAnalyses::none();
      96             : }

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