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Fix PR3667

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65464 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-02-25 18:20:01 +00:00
parent 411c285404
commit 58b1ac76d4
2 changed files with 39 additions and 1 deletions
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2
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -10837,7 +10837,7 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
// out, perform the transformation. Note, we don't know whether Scale is
// signed or not. We'll use unsigned version of division/modulo
// operation after making sure Scale doesn't have the sign bit set.
if (Scale && Scale->getSExtValue() >= 0LL &&
if (ArrayEltSize && Scale && Scale->getSExtValue() >= 0LL &&
Scale->getZExtValue() % ArrayEltSize == 0) {
Scale = ConstantInt::get(Scale->getType(),
Scale->getZExtValue() / ArrayEltSize);

38
test/Transforms/InstCombine/2009-02-25-CrashZeroSizeArray.ll Normal file
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@ -0,0 +1,38 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis
; PR3667
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32"
target triple = "i386-pc-linux-gnu"
define void @_ada_c32001b(i32 %tmp5) {
entry:
%max289 = select i1 false, i32 %tmp5, i32 0 ; <i32> [#uses=1]
%tmp6 = mul i32 %max289, 4 ; <i32> [#uses=1]
%tmp7 = alloca i8, i32 0 ; <i8*> [#uses=1]
%tmp8 = bitcast i8* %tmp7 to [0 x [0 x i32]]* ; <[0 x [0 x i32]]*> [#uses=1]
%tmp11 = load i32* null, align 1 ; <i32> [#uses=1]
%tmp12 = icmp eq i32 %tmp11, 3 ; <i1> [#uses=1]
%tmp13 = zext i1 %tmp12 to i8 ; <i8> [#uses=1]
%tmp14 = ashr i32 %tmp6, 2 ; <i32> [#uses=1]
%tmp15 = bitcast [0 x [0 x i32]]* %tmp8 to i8* ; <i8*> [#uses=1]
%tmp16 = mul i32 %tmp14, 4 ; <i32> [#uses=1]
%tmp17 = mul i32 1, %tmp16 ; <i32> [#uses=1]
%tmp18 = getelementptr i8* %tmp15, i32 %tmp17 ; <i8*> [#uses=1]
%tmp19 = bitcast i8* %tmp18 to [0 x i32]* ; <[0 x i32]*> [#uses=1]
%tmp20 = bitcast [0 x i32]* %tmp19 to i32* ; <i32*> [#uses=1]
%tmp21 = getelementptr i32* %tmp20, i32 0 ; <i32*> [#uses=1]
%tmp22 = load i32* %tmp21, align 1 ; <i32> [#uses=1]
%tmp23 = icmp eq i32 %tmp22, 4 ; <i1> [#uses=1]
%tmp24 = zext i1 %tmp23 to i8 ; <i8> [#uses=1]
%toBool709 = icmp ne i8 %tmp13, 0 ; <i1> [#uses=1]
%toBool710 = icmp ne i8 %tmp24, 0 ; <i1> [#uses=1]
%tmp25 = and i1 %toBool709, %toBool710 ; <i1> [#uses=1]
%tmp26 = zext i1 %tmp25 to i8 ; <i8> [#uses=1]
%toBool711 = icmp ne i8 %tmp26, 0 ; <i1> [#uses=1]
br i1 %toBool711, label %a, label %b
a: ; preds = %entry
ret void
b: ; preds = %entry
ret void
}