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comparison test/Analysis/BasicAA/full-store-partial-alias.ll @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
parents
children 60c9769439b8
comparison
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-1:000000000000 0:95c75e76d11b
1 ; RUN: opt -S -tbaa -basicaa -gvn < %s | FileCheck -check-prefix=BASICAA %s
2 ; RUN: opt -S -tbaa -gvn < %s | FileCheck %s
3 ; rdar://8875631, rdar://8875069
4
5 ; BasicAA should notice that the store stores to the entire %u object,
6 ; so the %tmp5 load is PartialAlias with the store and suppress TBAA.
7 ; Without BasicAA, TBAA should say that %tmp5 is NoAlias with the store.
8
9 target datalayout = "e-p:64:64:64"
10
11 %union.anon = type { double }
12
13 @u = global %union.anon { double -2.500000e-01 }, align 8
14 @endianness_test = global i64 1, align 8
15
16 define i32 @signbit(double %x) nounwind {
17 ; BASICAA: ret i32 %tmp5.lobit
18 ; CHECK: ret i32 0
19 entry:
20 %u = alloca %union.anon, align 8
21 %tmp9 = getelementptr inbounds %union.anon* %u, i64 0, i32 0
22 store double %x, double* %tmp9, align 8, !tbaa !0
23 %tmp2 = load i32* bitcast (i64* @endianness_test to i32*), align 8, !tbaa !3
24 %idxprom = sext i32 %tmp2 to i64
25 %tmp4 = bitcast %union.anon* %u to [2 x i32]*
26 %arrayidx = getelementptr inbounds [2 x i32]* %tmp4, i64 0, i64 %idxprom
27 %tmp5 = load i32* %arrayidx, align 4, !tbaa !3
28 %tmp5.lobit = lshr i32 %tmp5, 31
29 ret i32 %tmp5.lobit
30 }
31
32 !0 = metadata !{metadata !4, metadata !4, i64 0}
33 !1 = metadata !{metadata !"omnipotent char", metadata !2}
34 !2 = metadata !{metadata !"Simple C/C++ TBAA", null}
35 !3 = metadata !{metadata !5, metadata !5, i64 0}
36 !4 = metadata !{metadata !"double", metadata !1}
37 !5 = metadata !{metadata !"int", metadata !1}