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Fix PR1780

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43893 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Lenharth 2007-11-08 17:39:28 +00:00
parent e0cb36b9fb
commit ab9338eb9f
2 changed files with 20 additions and 1 deletions
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2
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -7582,7 +7582,7 @@ static unsigned GetOrEnforceKnownAlignment(Value *V, TargetData *TD,
unsigned PrefAlign = 0) {
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V)) {
unsigned Align = GV->getAlignment();
if (Align == 0 && TD)
if (Align == 0 && TD && !isa<OpaqueType>(GV->getType()->getElementType()))
Align = TD->getPrefTypeAlignment(GV->getType()->getElementType());
// If there is a large requested alignment and we can, bump up the alignment

19
test/Transforms/InstCombine/2007-11-07-OpaqueAlignCrash.ll Normal file
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@ -0,0 +1,19 @@
; RUN: llvm-as < %s | opt -instcombine -disable-output
; PR1780
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 = "i686-pc-linux-gnu"
%opaque_t = type opaque
@g = external global %opaque_t
define i32 @foo() {
entry:
%x = load i8* bitcast (%opaque_t* @g to i8*)
%y = load i32* bitcast (%opaque_t* @g to i32*)
%z = zext i8 %x to i32
%r = add i32 %y, %z
ret i32 %r
}