40 lines
1.5 KiB
LLVM
40 lines
1.5 KiB
LLVM
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; RUN: opt -S -disable-basic-aa -tbaa -cfl-steens-aa -gvn < %s | FileCheck -check-prefix=CFLSteensAA %s
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; RUN: opt -S -disable-basic-aa -tbaa -gvn < %s | FileCheck %s
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; Adapted from the BasicAA full-store-partial-alias.ll test.
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; CFL AA could 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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; FIXME: However, right now, CFLSteensAA cannot prove PartialAlias here
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; Without CFL AA, 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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; FIXME: This would be ret i32 %tmp5.lobit if CFLSteensAA could prove PartialAlias
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; CFLSteensAA: ret i32 0
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; CHECK: ret i32 0
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entry:
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%u = alloca %union.anon, align 8
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%tmp9 = getelementptr inbounds %union.anon, %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, 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], [2 x i32]* %tmp4, i64 0, i64 %idxprom
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%tmp5 = load i32, 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 = !{!4, !4, i64 0}
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!1 = !{!"omnipotent char", !2}
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!2 = !{!"Simple C/C++ TBAA"}
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!3 = !{!5, !5, i64 0}
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!4 = !{!"double", !1}
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!5 = !{!"int", !1}
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