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Add a testcase which demonstrates alias analysis pass precedence.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118755 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-11-11 01:03:30 +00:00
parent a05f60b241
commit f00833c401
1 changed files with 21 additions and 0 deletions
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21
test/Analysis/TypeBasedAliasAnalysis/precedence.ll Normal file
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; RUN: opt -enable-tbaa -basicaa -tbaa -gvn -instcombine -S < %s | grep {ret i32 0}
; RUN: opt -enable-tbaa -tbaa -basicaa -gvn -instcombine -S < %s | grep {ret i32 1075000115}
; According to the TBAA metadata the load and store don't alias. However,
; according to the actual code, they do. The order of the alias analysis
; passes should determine which of these takes precedence.
target datalayout = "e-p:64:64:64"
define i32 @trouble(i32* %x) nounwind ssp {
entry:
store i32 0, i32* %x, !tbaa !0
%0 = bitcast i32* %x to float*
store float 0x4002666660000000, float* %0, !tbaa !3
%tmp3 = load i32* %x, !tbaa !0
ret i32 %tmp3
}
!0 = metadata !{metadata !"int", metadata !1}
!1 = metadata !{metadata !"simple"}
!3 = metadata !{metadata !"float", metadata !1}