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Fix a crash in SimpliftDemandedBits of vectors of pointers. 

PR14183.

llvm-svn: 166785
This commit is contained in:
Nadav Rotem 2012-10-26 17:17:05 +00:00
parent 6fe7acab9d
commit 15198e94d2
2 changed files with 55 additions and 6 deletions
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10
llvm/lib/Analysis/ValueTracking.cpp
View File

@ -430,15 +430,13 @@ void llvm::ComputeMaskedBits(Value *V, APInt &KnownZero, APInt &KnownOne,
case Instruction::ZExt:
case Instruction::Trunc: {
Type *SrcTy = I->getOperand(0)->getType();
unsigned SrcBitWidth;
// Note that we handle pointer operands here because of inttoptr/ptrtoint
// which fall through here.
if (SrcTy->isPointerTy())
SrcBitWidth = TD->getTypeSizeInBits(SrcTy);
else
SrcBitWidth = SrcTy->getScalarSizeInBits();
SrcBitWidth = TD->getTypeSizeInBits(SrcTy->getScalarType());
assert(SrcBitWidth && "SrcBitWidth can't be zero");
KnownZero = KnownZero.zextOrTrunc(SrcBitWidth);
KnownOne = KnownOne.zextOrTrunc(SrcBitWidth);
ComputeMaskedBits(I->getOperand(0), KnownZero, KnownOne, TD, Depth+1);

51
llvm/test/Transforms/InstCombine/2012-10-25-vector-of-pointers.ll Normal file
View File

@ -0,0 +1,51 @@
; RUN: opt < %s -instcombine -S
; Make sure that we don't crash when optimizing the vectors of pointers.
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.8.0"
%struct.hoge = type { double*, double*, double*, double** }
define void @widget(%struct.hoge* nocapture %arg) nounwind uwtable ssp {
bb:
%tmp = getelementptr inbounds %struct.hoge* %arg, i64 0, i32 0
br i1 undef, label %bb1, label %bb17
bb1: ; preds = %bb
br i1 undef, label %bb2, label %bb3
bb2: ; preds = %bb1
br label %bb17
bb3: ; preds = %bb1
%tmp4 = bitcast double** %tmp to <2 x double*>*
%tmp5 = load <2 x double*>* %tmp4, align 8
%tmp6 = ptrtoint <2 x double*> %tmp5 to <2 x i64>
%tmp7 = sub <2 x i64> zeroinitializer, %tmp6
%tmp8 = ashr exact <2 x i64> %tmp7, <i64 3, i64 3>
%tmp9 = extractelement <2 x i64> %tmp8, i32 0
%tmp10 = add nsw i64 undef, %tmp9
br i1 undef, label %bb11, label %bb12
bb11: ; preds = %bb3
br label %bb13
bb12: ; preds = %bb3
br label %bb13
bb13: ; preds = %bb12, %bb11
br i1 undef, label %bb16, label %bb14
bb14: ; preds = %bb13
br i1 undef, label %bb16, label %bb15
bb15: ; preds = %bb14
br label %bb16
bb16: ; preds = %bb15, %bb14, %bb13
unreachable
bb17: ; preds = %bb2, %bb
ret void
}