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a0e8011216
Summary:
This change adds some verification in the IR verifier around struct path
TBAA metadata.
Other than some basic sanity checks (e.g. we get constant integers where
we expect constant integers), this checks:
- That by the time an struct access tuple `(base-type, offset)` is
"reduced" to a scalar base type, the offset is `0`. For instance, in
C++ you can't start from, say `("struct-a", 16)`, and end up with
`("int", 4)` -- by the time the base type is `"int"`, the offset
better be zero. In particular, a variant of this invariant is needed
for `llvm::getMostGenericTBAA` to be correct.
- That there are no cycles in a struct path.
- That struct type nodes have their offsets listed in an ascending
order.
- That when generating the struct access path, you eventually reach the
access type listed in the tbaa tag node.
Reviewers: dexonsmith, chandlerc, reames, mehdi_amini, manmanren
Subscribers: mcrosier, llvm-commits
Differential Revision: https://reviews.llvm.org/D26438
llvm-svn: 289402
38 lines
1.3 KiB
LLVM
38 lines
1.3 KiB
LLVM
; RUN: opt -S -tbaa -gvn < %s | FileCheck -check-prefix=BASICAA %s
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; RUN: opt -S -tbaa -disable-basicaa -gvn < %s | FileCheck %s
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; rdar://8875631, rdar://8875069
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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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; BASICAA: ret i32 %tmp5.lobit
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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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