1; REQUIRES: asserts
2; RUN: opt < %s -loop-unswitch -enable-new-pm=0 -stats -disable-output 2>&1 | FileCheck %s
3; RUN: opt < %s -loop-unswitch -enable-new-pm=0 -enable-mssa-loop-dependency=true -verify-memoryssa -stats -disable-output 2>&1 | FileCheck %s
4; PR 3170
5
6define i32 @a(i32 %x, i32 %y) nounwind {
7; CHECK: 1 loop-unswitch - Number of branches unswitched
8; CHECK-NOT: Number of branches unswitched
9
10entry:
11	%0 = icmp ult i32 0, %y		; <i1> [#uses=1]
12	br i1 %0, label %bb.nph, label %bb4
13
14bb.nph:		; preds = %entry
15	%1 = icmp eq i32 %x, 0		; <i1> [#uses=1]
16	br label %bb
17
18bb:		; preds = %bb.nph, %bb3
19	%i.01 = phi i32 [ %3, %bb3 ], [ 0, %bb.nph ]		; <i32> [#uses=1]
20	br i1 %1, label %bb2, label %bb1
21
22bb1:		; preds = %bb
23	%2 = tail call i32 (...) @b() nounwind		; <i32> [#uses=0]
24	br label %bb2
25
26bb2:		; preds = %bb, %bb1
27	%3 = add i32 %i.01, 1		; <i32> [#uses=2]
28	br label %bb3
29
30bb3:		; preds = %bb2
31	%i.0 = phi i32 [ %3, %bb2 ]		; <i32> [#uses=1]
32	%4 = icmp ult i32 %i.0, %y		; <i1> [#uses=1]
33	br i1 %4, label %bb, label %bb3.bb4_crit_edge
34
35bb3.bb4_crit_edge:		; preds = %bb3
36	br label %bb4
37
38bb4:		; preds = %bb3.bb4_crit_edge, %entry
39	ret i32 0
40}
41
42declare i32 @b(...)
43