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change GetStoreValueForLoad to use IRBuilder, which is cleaner and 

implicitly constant folds.

llvm-svn: 90977
This commit is contained in:
Chris Lattner 2009-12-09 18:13:28 +00:00
parent d0caa82b36
commit f8ba1253f1
1 changed files with 7 additions and 7 deletions
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14
llvm/lib/Transforms/Scalar/GVN.cpp
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@ -1151,14 +1151,15 @@ static Value *GetStoreValueForLoad(Value *SrcVal, unsigned Offset,
uint64_t StoreSize = TD.getTypeSizeInBits(SrcVal->getType())/8;
uint64_t LoadSize = TD.getTypeSizeInBits(LoadTy)/8;
IRBuilder<> Builder(InsertPt->getParent(), InsertPt);
// Compute which bits of the stored value are being used by the load. Convert
// to an integer type to start with.
if (isa<PointerType>(SrcVal->getType()))
SrcVal = new PtrToIntInst(SrcVal, TD.getIntPtrType(Ctx), "tmp", InsertPt);
SrcVal = Builder.CreatePtrToInt(SrcVal, TD.getIntPtrType(Ctx), "tmp");
if (!isa<IntegerType>(SrcVal->getType()))
SrcVal = new BitCastInst(SrcVal, IntegerType::get(Ctx, StoreSize*8),
"tmp", InsertPt);
SrcVal = Builder.CreateBitCast(SrcVal, IntegerType::get(Ctx, StoreSize*8),
"tmp");
// Shift the bits to the least significant depending on endianness.
unsigned ShiftAmt;
@ -1168,12 +1169,11 @@ static Value *GetStoreValueForLoad(Value *SrcVal, unsigned Offset,
ShiftAmt = (StoreSize-LoadSize-Offset)*8;
if (ShiftAmt)
SrcVal = BinaryOperator::CreateLShr(SrcVal,
ConstantInt::get(SrcVal->getType(), ShiftAmt), "tmp", InsertPt);
SrcVal = Builder.CreateLShr(SrcVal, ShiftAmt, "tmp");
if (LoadSize != StoreSize)
SrcVal = new TruncInst(SrcVal, IntegerType::get(Ctx, LoadSize*8),
"tmp", InsertPt);
SrcVal = Builder.CreateTrunc(SrcVal, IntegerType::get(Ctx, LoadSize*8),
"tmp");
return CoerceAvailableValueToLoadType(SrcVal, LoadTy, InsertPt, TD);
}