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Revert r149110 and add a testcase that was crashing since that revision.

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Unfortunately I also had to disable constant-pool-sharing.ll the code it tests has been
updated to use the IL logic.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149148 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2012-01-27 22:42:48 +00:00
parent 907cc8f38d
commit 41cedd740d
4 changed files with 15 additions and 53 deletions
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38
lib/Analysis/ConstantFolding.cpp
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@@ -52,44 +52,6 @@ static Constant *FoldBitCast(Constant *C, Type *DestTy,
if (C->isAllOnesValue() && !DestTy->isX86_MMXTy())
return Constant::getAllOnesValue(DestTy);
// Handle a vector->integer cast.
if (IntegerType *IT = dyn_cast<IntegerType>(DestTy)) {
// FIXME: Remove ConstantVector support.
if ((!isa<ConstantDataVector>(C) && !isa<ConstantVector>(C)) ||
// TODO: Handle big endian someday.
!TD.isLittleEndian())
return ConstantExpr::getBitCast(C, DestTy);
unsigned NumSrcElts = C->getType()->getVectorNumElements();
// If the vector is a vector of floating point, convert it to vector of int
// to simplify things.
if (C->getType()->getVectorElementType()->isFloatingPointTy()) {
unsigned FPWidth =
C->getType()->getVectorElementType()->getPrimitiveSizeInBits();
Type *SrcIVTy =
VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumSrcElts);
// Ask VMCore to do the conversion now that #elts line up.
C = ConstantExpr::getBitCast(C, SrcIVTy);
}
// Now that we know that the input value is a vector of integers, just shift
// and insert them into our result.
unsigned BitShift =
TD.getTypeAllocSizeInBits(C->getType()->getVectorElementType());
APInt Result(IT->getBitWidth(), 0);
for (unsigned i = 0; i != NumSrcElts; ++i) {
// FIXME: Rework when we have ConstantDataVector.
ConstantInt *Elt=dyn_cast_or_null<ConstantInt>(C->getAggregateElement(i));
if (Elt == 0) // Elt must be a constant expr or something.
return ConstantExpr::getBitCast(C, DestTy);
Result |= Elt->getValue().zext(IT->getBitWidth()) << i*BitShift;
}
return ConstantInt::get(IT, Result);
}
// The code below only handles casts to vectors currently.
VectorType *DestVTy = dyn_cast<VectorType>(DestTy);
if (DestVTy == 0)