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a942d77488
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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289402 91177308-0d34-0410-b5e6-96231b3b80d8
31 lines
881 B
LLVM
31 lines
881 B
LLVM
; RUN: opt -instcombine -S < %s | FileCheck %s
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target datalayout = "e-m:e-p:64:64:64-i64:64-f80:128-n8:16:32:64-S128"
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; CHECK-LABEL: @test_load_load_combine_metadata(
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; Check that range and AA metadata is combined
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; CHECK: %[[V:.*]] = load i32, i32* %0
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; CHECK-SAME: !tbaa !{{[0-9]+}}
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; CHECK-SAME: !range ![[RANGE:[0-9]+]]
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; CHECK: store i32 %[[V]], i32* %1
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; CHECK: store i32 %[[V]], i32* %2
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define void @test_load_load_combine_metadata(i32*, i32*, i32*) {
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%a = load i32, i32* %0, !tbaa !8, !range !0, !alias.scope !5, !noalias !6
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%b = load i32, i32* %0, !tbaa !8, !range !1
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store i32 %a, i32* %1
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store i32 %b, i32* %2
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ret void
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}
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; CHECK: ![[RANGE]] = !{i32 0, i32 5, i32 7, i32 9}
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!0 = !{ i32 0, i32 5 }
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!1 = !{ i32 7, i32 9 }
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!2 = !{!2}
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!3 = !{!3, !2}
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!4 = !{!4, !2}
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!5 = !{!3}
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!6 = !{!4}
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!7 = !{ !"tbaa root" }
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!8 = !{ !9, !9, i64 0 }
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!9 = !{ !"scalar type", !7}
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