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[InstCombine] visitBitCast(): do not crash on weird bitcast <1 x i8*> to i8*

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Even if we know that RHS of a bitcast is a pointer,
we can't assume LHS is, because it might be
a single-element vector of pointer.
This commit is contained in:
Roman Lebedev 2020-06-24 21:12:09 +03:00
parent 1208cc1611
commit 0a9046a444
2 changed files with 8 additions and 1 deletions
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3
lib/Transforms/InstCombine/InstCombineCasts.cpp
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@ -2471,8 +2471,9 @@ Instruction *InstCombiner::visitBitCast(BitCastInst &CI) {
if (DestTy == Src->getType())
return replaceInstUsesWith(CI, Src);
if (PointerType *DstPTy = dyn_cast<PointerType>(DestTy)) {
if (isa<PointerType>(SrcTy) && isa<PointerType>(DestTy)) {
PointerType *SrcPTy = cast<PointerType>(SrcTy);
PointerType *DstPTy = cast<PointerType>(DestTy);
Type *DstElTy = DstPTy->getElementType();
Type *SrcElTy = SrcPTy->getElementType();

6
test/Transforms/InstCombine/bitcast.ll
View File

@ -561,3 +561,9 @@ define void @constant_fold_vector_to_half() {
store volatile half bitcast (<4 x i4> <i4 0, i4 0, i4 0, i4 4> to half), half* undef
ret void
}
; Ensure that we do not crash when looking at such a weird bitcast.
define i8* @bitcast_from_single_element_pointer_vector_to_pointer(<1 x i8*> %ptrvec) {
%ptr = bitcast <1 x i8*> %ptrvec to i8*
ret i8* %ptr
}