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55 lines
1.7 KiB
LLVM
55 lines
1.7 KiB
LLVM
; RUN: opt -basic-aa -loop-versioning -S < %s | FileCheck %s
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; A very simple case. After versioning the %loadA and %loadB can't alias with
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; the store.
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;
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; To see it easier what's going on, I expanded every noalias/scope metadata
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; reference below in a comment. For a scope I use the format scope(domain),
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; e.g. scope 17 in domain 15 is written as 17(15).
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; CHECK-LABEL: @f(
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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define void @f(i32* %a, i32* %b, i32* %c) {
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entry:
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br label %for.body
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; CHECK: for.body.lver.orig:
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; CHECK: for.body:
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for.body: ; preds = %for.body, %entry
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%ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
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%arrayidxA = getelementptr inbounds i32, i32* %a, i64 %ind
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; CHECK: %loadA = {{.*}} !alias.scope !0
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; A's scope: !0 -> { 1(2) }
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%loadA = load i32, i32* %arrayidxA, align 4
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%arrayidxB = getelementptr inbounds i32, i32* %b, i64 %ind
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; CHECK: %loadB = {{.*}} !alias.scope !3
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; B's scope: !3 -> { 4(2) }
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%loadB = load i32, i32* %arrayidxB, align 4
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%mulC = mul i32 %loadA, %loadB
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%arrayidxC = getelementptr inbounds i32, i32* %c, i64 %ind
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; CHECK: store {{.*}} !alias.scope !5, !noalias !7
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; C noalias A and B: !7 -> { 1(2), 4(2) }
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store i32 %mulC, i32* %arrayidxC, align 4
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%add = add nuw nsw i64 %ind, 1
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%exitcond = icmp eq i64 %add, 20
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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; CHECK: !0 = !{!1}
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; CHECK: !1 = distinct !{!1, !2}
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; CHECK: !2 = distinct !{!2, !"LVerDomain"}
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; CHECK: !3 = !{!4}
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; CHECK: !4 = distinct !{!4, !2}
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; CHECK: !5 = !{!6}
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; CHECK: !6 = distinct !{!6, !2}
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; CHECK: !7 = !{!1, !4}
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