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ConstantVector returns arbitrary value for the wrong index.

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This fixes PR10813.

llvm-svn: 139006
This commit is contained in:
Jakub Staszak 2011-09-02 15:43:43 +00:00
parent b82758ae9b
commit 132e24bf28
2 changed files with 33 additions and 0 deletions
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4
lib/VMCore/ConstantFold.cpp
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@ -761,6 +761,10 @@ Constant *llvm::ConstantFoldExtractElementInstruction(Constant *Val,
if (ConstantVector *CVal = dyn_cast<ConstantVector>(Val)) { if (ConstantVector *CVal = dyn_cast<ConstantVector>(Val)) {
if (ConstantInt *CIdx = dyn_cast<ConstantInt>(Idx)) { if (ConstantInt *CIdx = dyn_cast<ConstantInt>(Idx)) {
uint64_t Index = CIdx->getZExtValue();
if (Index >= CVal->getNumOperands())
// ee({w,x,y,z}, wrong_value) -> w (an arbitrary value).
return CVal->getOperand(0);
return CVal->getOperand(CIdx->getZExtValue()); return CVal->getOperand(CIdx->getZExtValue());
} else if (isa<UndefValue>(Idx)) { } else if (isa<UndefValue>(Idx)) {
// ee({w,x,y,z}, undef) -> w (an arbitrary value). // ee({w,x,y,z}, undef) -> w (an arbitrary value).

29
test/Transforms/LoopUnroll/pr10813.ll Normal file
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@ -0,0 +1,29 @@
; RUN: opt < %s -loop-unroll -disable-output
define void @"f_fu___REFUf[]REFUf[]Uf"() nounwind {
allocas:
br i1 undef, label %cif_mask_all, label %cif_mixed_test_all
cif_mask_all: ; preds = %allocas
unreachable
cif_mixed_test_all: ; preds = %allocas
br label %pl_loop.i964
pl_loop.i964: ; preds = %pl_loopend.i973, %cif_mixed_test_all
%0 = phi i32 [ %pl_nextlane.i971, %pl_loopend.i973 ], [ 0, %cif_mixed_test_all ]
br i1 undef, label %pl_dolane.i970, label %pl_loopend.i973
pl_dolane.i970: ; preds = %pl_loop.i964
%storeval.i.i969 = extractelement <4 x i8> <i8 0, i8 1, i8 2, i8 3>, i32 %0
store i8 %storeval.i.i969, i8* undef, align 1
br label %pl_loopend.i973
pl_loopend.i973: ; preds = %pl_dolane.i970, %pl_loop.i964
%pl_nextlane.i971 = add i32 %0, 1
%exitcond5 = icmp ne i32 %pl_nextlane.i971, 5
br i1 %exitcond5, label %pl_loop.i964, label %__scatter_base_offsets_i8.exit974
__scatter_base_offsets_i8.exit974: ; preds = %pl_loopend.i973
unreachable
}