1; RUN: opt -S -basicaa -licm < %s | FileCheck %s
2;
3; Manually validate LCSSA form is preserved even after SSAUpdater is used to
4; promote things in the loop bodies.
5
6target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
7target triple = "x86_64-unknown-linux-gnu"
8
9@x = common global i32 0, align 4
10@y = common global i32 0, align 4
11
12define void @PR18688() {
13; CHECK-LABEL: @PR18688(
14
15entry:
16  br i1 undef, label %return, label %outer.preheader
17
18outer.preheader:
19  br label %outer.header
20; CHECK: outer.preheader:
21; CHECK: br label %outer.header
22
23outer.header:
24  store i32 0, i32* @x, align 4
25  br i1 undef, label %outer.latch, label %inner.preheader
26; CHECK: outer.header:
27; CHECK-NEXT: br i1 undef, label %outer.latch, label %inner.preheader
28
29inner.preheader:
30  br label %inner.header
31; CHECK: inner.preheader:
32; CHECK-NEXT: br label %inner.header
33
34inner.header:
35  br i1 undef, label %inner.body.rhs, label %inner.latch
36; CHECK: inner.header:
37; CHECK-NEXT: %[[PHI0:[^,]+]] = phi i32 [ %{{[^,]+}}, %inner.latch ], [ 0, %inner.preheader ]
38; CHECK-NEXT: br i1 undef, label %inner.body.rhs, label %inner.latch
39
40inner.body.rhs:
41  store i32 0, i32* @x, align 4
42  br label %inner.latch
43; CHECK: inner.body.rhs:
44; CHECK-NEXT: br label %inner.latch
45
46inner.latch:
47  %y_val = load i32, i32* @y, align 4
48  %icmp = icmp eq i32 %y_val, 0
49  br i1 %icmp, label %inner.exit, label %inner.header
50; CHECK: inner.latch:
51; CHECK-NEXT: %[[PHI1:[^,]+]] = phi i32 [ 0, %inner.body.rhs ], [ %[[PHI0]], %inner.header ]
52; CHECK-NEXT: br i1 %{{[^,]+}}, label %inner.exit, label %inner.header
53
54inner.exit:
55  br label %outer.latch
56; CHECK: inner.exit:
57; CHECK-NEXT: %[[INNER_LCSSA:[^,]+]] = phi i32 [ %[[PHI1]], %inner.latch ]
58; CHECK-NEXT: br label %outer.latch
59
60outer.latch:
61  br i1 undef, label %outer.exit, label %outer.header
62; CHECK: outer.latch:
63; CHECK-NEXT: %[[PHI2:[^,]+]] = phi i32 [ %[[INNER_LCSSA]], %inner.exit ], [ 0, %outer.header ]
64; CHECK-NEXT: br i1 {{.*}}, label %outer.exit, label %outer.header
65
66outer.exit:
67  br label %return
68; CHECK: outer.exit:
69; CHECK-NEXT: %[[OUTER_LCSSA:[^,]+]] = phi i32 [ %[[PHI2]], %outer.latch ]
70; CHECK-NEXT: store i32 %[[OUTER_LCSSA]]
71; CHECK-NEXT: br label %return
72
73return:
74  ret void
75}
76
77