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Implement Constant::isAllOnesValue(). Fix ConstantFolding to use the new api.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138469 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2011-08-24 20:18:38 +00:00
parent df9ce6bbc5
commit 4c7c0f2353
5 changed files with 62 additions and 19 deletions
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17
lib/Analysis/ConstantFolding.cpp
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@@ -45,16 +45,12 @@ using namespace llvm;
/// ConstantExpr if unfoldable.
static Constant *FoldBitCast(Constant *C, Type *DestTy,
const TargetData &TD) {
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);
}
// Catch the obvious splat cases.
if (C->isNullValue() && !DestTy->isX86_MMXTy())
return Constant::getNullValue(DestTy);
if (C->isAllOnesValue() && !DestTy->isX86_MMXTy())
return Constant::getAllOnesValue(DestTy);
// The code below only handles casts to vectors currently.
VectorType *DestVTy = dyn_cast<VectorType>(DestTy);
if (DestVTy == 0)
@@ -68,6 +64,7 @@ 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);