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Fix a case where instcombine was stripping metadata (and alignment)

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from stores when folding in bitcasts.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117265 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-10-25 16:16:27 +00:00
parent 970bfcc7d8
commit 17a0bf996f
2 changed files with 24 additions and 1 deletions
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4
lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
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@ -330,7 +330,9 @@ static Instruction *InstCombineStoreToCast(InstCombiner &IC, StoreInst &SI) {
NewCast = IC.Builder->CreateCast(opcode, SIOp0, CastDstTy,
SIOp0->getName()+".c");
return new StoreInst(NewCast, CastOp);
SI.setOperand(0, NewCast);
SI.setOperand(1, CastOp);
return &SI;
}
/// equivalentAddressValues - Test if A and B will obviously have the same

21
test/Transforms/InstCombine/bitcast-store.ll Normal file
View File

@ -0,0 +1,21 @@
; RUN: opt -S -instcombine < %s | FileCheck %s
; Instcombine should preserve metadata and alignment while
; folding a bitcast into a store.
; CHECK: store i32 (...)** bitcast (i8** getelementptr inbounds ([5 x i8*]* @G, i64 0, i64 2) to i32 (...)**), i32 (...)*** %0, align 16, !tag !0
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"
%struct.A = type { i32 (...)** }
@G = external constant [5 x i8*]
define void @foo(%struct.A* %a) nounwind {
entry:
%0 = bitcast %struct.A* %a to i8***
store i8** getelementptr inbounds ([5 x i8*]* @G, i64 0, i64 2), i8*** %0, align 16, !tag !0
ret void
}
!0 = metadata !{metadata !"hello"}