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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
38 lines
1.2 KiB
LLVM
38 lines
1.2 KiB
LLVM
; RUN: opt -loop-vectorize -tbaa -S -mattr=+neon < %s | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "armv7--linux-gnueabi"
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; This requires the loop vectorizer to create an interleaved access group
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; for the stores to the struct. Here we need to perform a bitcast from a vector
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; of pointers to a vector i32s.
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%class.A = type { i8*, i32 }
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; CHECK-LABEL: test0
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define void @test0(%class.A* %StartPtr, %class.A* %APtr) {
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entry:
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br label %for.body.i
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for.body.i:
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%addr = phi %class.A* [ %StartPtr, %entry ], [ %incdec.ptr.i, %for.body.i ]
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%Data.i.i = getelementptr inbounds %class.A, %class.A* %addr, i32 0, i32 0
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store i8* null, i8** %Data.i.i, align 4, !tbaa !8
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%Length.i.i = getelementptr inbounds %class.A, %class.A* %addr, i32 0, i32 1
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store i32 0, i32* %Length.i.i, align 4, !tbaa !11
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%incdec.ptr.i = getelementptr inbounds %class.A, %class.A* %addr, i32 1
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%cmp.i = icmp eq %class.A* %incdec.ptr.i, %APtr
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br i1 %cmp.i, label %exit, label %for.body.i
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exit:
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ret void
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}
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!5 = !{!"any pointer", !6, i64 0}
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!6 = !{!"omnipotent char", !7, i64 0}
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!7 = !{!"Simple C/C++ TBAA"}
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!8 = !{!9, !5, i64 0}
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!9 = !{!"some struct", !5, i64 0, !10, i64 4}
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!10 = !{!"int", !6, i64 0}
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!11 = !{!9, !10, i64 4}
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