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Add constant folding support for bitcasts of splat vectors to integers.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138206 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2011-08-20 14:02:29 +00:00
parent 77c108241a
commit 1c9fe0361b
2 changed files with 20 additions and 2 deletions
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12
lib/Analysis/ConstantFolding.cpp
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@@ -46,7 +46,16 @@ using namespace llvm;
static Constant *FoldBitCast(Constant *C, Type *DestTy,
const TargetData &TD) {
// This only handles casts to vectors currently.
ConstantVector *CV = dyn_cast<ConstantVector>(C);
IntegerType *IntVTy = dyn_cast<IntegerType>(DestTy);
// When casting vectors to scalar integers, catch the
// obvious splat cases.
if (IntVTy && CV) {
if (CV->isNullValue()) return ConstantInt::getNullValue(IntVTy);
if (CV->isAllOnesValue()) return ConstantInt::getAllOnesValue(IntVTy);
}
// The code below only handles casts to vectors currently.
VectorType *DestVTy = dyn_cast<VectorType>(DestTy);
if (DestVTy == 0)
return ConstantExpr::getBitCast(C, DestTy);
@@ -59,7 +68,6 @@ static Constant *FoldBitCast(Constant *C, Type *DestTy,
}
// If this is a bitcast from constant vector -> vector, fold it.
ConstantVector *CV = dyn_cast<ConstantVector>(C);
if (CV == 0)
return ConstantExpr::getBitCast(C, DestTy);