1 ; RUN: opt < %s -loop-versioning -S -o - | FileCheck %s
3 ; This test case used to end like this:
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!
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.
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
18 ; CHECK: define void @f1
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
23 ; CHECK-NEXT: store i16 %t2.lver
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
31 %t0 = load i16*, i16** @c, align 1
34 for.cond: ; preds = %for.cond.backedge, %entry
37 for.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
45 for.end: ; preds = %for.body
46 %tobool = icmp eq i16 %t2, 0
47 br i1 %tobool, label %for.cond.backedge, label %if.then
49 for.cond.backedge: ; preds = %for.end, %if.then
52 if.then: ; preds = %for.end
53 store i16 %t2, i16* @a, align 1, !tbaa !2
54 br label %for.cond.backedge
57 !llvm.module.flags = !{!0}
60 !0 = !{i32 1, !"wchar_size", i32 1}
61 !1 = !{!"clang version 7.0.0"}
63 !3 = !{!"long long", !4, i64 0}
64 !4 = !{!"omnipotent char", !5, i64 0}
65 !5 = !{!"Simple C/C++ TBAA"}