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1; RUN: opt < %s -loop-versioning -S -o - | FileCheck %s
2
3; This test case used to end like this:
4;
5;    Instruction does not dominate all uses!
6;      %t2 = load i16, i16* @b, align 1, !tbaa !2, !alias.scope !6
7;      %tobool = icmp eq i16 %t2, 0
8;    LLVM ERROR: Broken function found, compilation aborted!
9;
10; due to a fault where we did not replace the use of %t2 in the icmp in
11; for.end, when adding a new PHI node for the versioned loops based on the
12; loop-defined values used outside of the loop.
13;
14; Verify that the code compiles, that we get a versioned loop, and that the
15; uses of %t2 in for.end and if.then are updated to use the value from the
16; added phi node.
17
18; CHECK:       define void @f1
19; CHECK:       for.end.loopexit:
20; CHECK-NEXT:    %t2.lver.ph = phi i16 [ %t2.lver.orig, %for.body.lver.orig ]
21; CHECK:       for.end.loopexit2:
22; CHECK-NEXT:    %t2.lver.ph3 = phi i16 [ %t2, %for.body ]
23; CHECK:       for.end:
24; CHECK-NEXT:    %t2.lver = phi i16 [ %t2.lver.ph, %for.end.loopexit ], [ %t2.lver.ph3, %for.end.loopexit2 ]
25; CHECK-NEXT:    %tobool = icmp eq i16 %t2.lver, 0
26; CHECK:       if.then:
27; CHECK-NEXT:    store i16 %t2.lver
28
29@a = dso_local global i16 0, align 1
30@b = dso_local global i16 0, align 1
31@c = dso_local global i16* null, align 1
32
33define void @f1() {
34entry:
35  %t0 = load i16*, i16** @c, align 1
36  br label %for.cond
37
38for.cond:                                         ; preds = %for.cond.backedge, %entry
39  br label %for.body
40
41for.body:                                         ; preds = %for.cond, %for.body
42  %t1 = phi i64 [ 0, %for.cond ], [ %inc, %for.body ]
43  %t2 = load i16, i16* @b, align 1, !tbaa !2
44  store i16 %t2, i16* %t0, align 1, !tbaa !2
45  %inc = add nuw nsw i64 %t1, 1
46  %cmp = icmp ult i64 %inc, 3
47  br i1 %cmp, label %for.body, label %for.end
48
49for.end:                                          ; preds = %for.body
50  %tobool = icmp eq i16 %t2, 0
51  br i1 %tobool, label %for.cond.backedge, label %if.then
52
53for.cond.backedge:                                ; preds = %for.end, %if.then
54  br label %for.cond
55
56if.then:                                          ; preds = %for.end
57  store i16 %t2, i16* @a, align 1, !tbaa !2
58  br label %for.cond.backedge
59}
60
61!llvm.module.flags = !{!0}
62!llvm.ident = !{!1}
63
64!0 = !{i32 1, !"wchar_size", i32 1}
65!1 = !{!"clang version 7.0.0"}
66!2 = !{!3, !3, i64 0}
67!3 = !{!"long long", !4, i64 0}
68!4 = !{!"omnipotent char", !5, i64 0}
69!5 = !{!"Simple C/C++ TBAA"}
70