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https://github.com/c64scene-ar/llvm-6502.git
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615da1a9bc
are pointing to the same object, one pointer is accessing the entire object, and the other is access has a non-zero size. This prevents TBAA from kicking in and saying NoAlias in such cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123775 91177308-0d34-0410-b5e6-96231b3b80d8
34 lines
1.2 KiB
LLVM
34 lines
1.2 KiB
LLVM
; RUN: opt -S -tbaa -basicaa -gvn < %s | grep {ret i32 %}
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; RUN: opt -S -tbaa -gvn < %s | grep {ret i32 0}
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; rdar://8875631
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; BasicAA should notice that the store stores to the entire %u object,
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; so the %tmp5 load is PartialAlias with the store and suppress TBAA.
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; Without BasicAA, TBAA should say that %tmp5 is NoAlias with the store.
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target datalayout = "e-p:64:64:64"
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%union.anon = type { double }
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@u = global %union.anon { double -2.500000e-01 }, align 8
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@endianness_test = global i64 1, align 8
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define i32 @signbit(double %x) nounwind {
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entry:
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%u = alloca %union.anon, align 8
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%tmp9 = getelementptr inbounds %union.anon* %u, i64 0, i32 0
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store double %x, double* %tmp9, align 8, !tbaa !0
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%tmp2 = load i32* bitcast (i64* @endianness_test to i32*), align 8, !tbaa !3
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%idxprom = sext i32 %tmp2 to i64
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%tmp4 = bitcast %union.anon* %u to [2 x i32]*
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%arrayidx = getelementptr inbounds [2 x i32]* %tmp4, i64 0, i64 %idxprom
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%tmp5 = load i32* %arrayidx, align 4, !tbaa !3
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%tmp5.lobit = lshr i32 %tmp5, 31
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ret i32 %tmp5.lobit
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}
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!0 = metadata !{metadata !"double", metadata !1}
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!1 = metadata !{metadata !"omnipotent char", metadata !2}
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!2 = metadata !{metadata !"Simple C/C++ TBAA", null}
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!3 = metadata !{metadata !"int", metadata !1}
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