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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:
20; CHECK-NEXT:    %t2.lver = phi i16 [ %t2, %for.body ], [ %t2.lver.orig, %for.body.lver.orig ]
21; CHECK-NEXT:    %tobool = icmp eq i16 %t2.lver, 0
22; CHECK:       if.then:
23; CHECK-NEXT:    store i16 %t2.lver
24
25@a = dso_local global i16 0, align 1
26@b = dso_local global i16 0, align 1
27@c = dso_local global i16* null, align 1
28
29define void @f1() {
30entry:
31  %t0 = load i16*, i16** @c, align 1
32  br label %for.cond
33
34for.cond:                                         ; preds = %for.cond.backedge, %entry
35  br label %for.body
36
37for.body:                                         ; preds = %for.cond, %for.body
38  %t1 = phi i64 [ 0, %for.cond ], [ %inc, %for.body ]
39  %t2 = load i16, i16* @b, align 1, !tbaa !2
40  store i16 %t2, i16* %t0, align 1, !tbaa !2
41  %inc = add nuw nsw i64 %t1, 1
42  %cmp = icmp ult i64 %inc, 3
43  br i1 %cmp, label %for.body, label %for.end
44
45for.end:                                          ; preds = %for.body
46  %tobool = icmp eq i16 %t2, 0
47  br i1 %tobool, label %for.cond.backedge, label %if.then
48
49for.cond.backedge:                                ; preds = %for.end, %if.then
50  br label %for.cond
51
52if.then:                                          ; preds = %for.end
53  store i16 %t2, i16* @a, align 1, !tbaa !2
54  br label %for.cond.backedge
55}
56
57!llvm.module.flags = !{!0}
58!llvm.ident = !{!1}
59
60!0 = !{i32 1, !"wchar_size", i32 1}
61!1 = !{!"clang version 7.0.0"}
62!2 = !{!3, !3, i64 0}
63!3 = !{!"long long", !4, i64 0}
64!4 = !{!"omnipotent char", !5, i64 0}
65!5 = !{!"Simple C/C++ TBAA"}
66