1 ; RUN: opt -S -basicaa -licm < %s | FileCheck %s
3 ; Manually validate LCSSA form is preserved even after SSAUpdater is used to
4 ; promote things in the loop bodies.
6 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
7 target triple = "x86_64-unknown-linux-gnu"
9 @x = common global i32 0, align 4
10 @y = common global i32 0, align 4
12 define void @PR18688() {
13 ; CHECK-LABEL: @PR18688(
16 br i1 undef, label %return, label %outer.preheader
19 br label %outer.header
20 ; CHECK: outer.preheader:
21 ; CHECK: br label %outer.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
30 br label %inner.header
31 ; CHECK: inner.preheader:
32 ; CHECK-NEXT: br label %inner.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
41 store i32 0, i32* @x, align 4
43 ; CHECK: inner.body.rhs:
44 ; CHECK-NEXT: br label %inner.latch
47 %y_val = load i32* @y, align 4
48 %icmp = icmp eq i32 %y_val, 0
49 br i1 %icmp, label %inner.exit, label %inner.header
51 ; CHECK-NEXT: %[[PHI1:[^,]+]] = phi i32 [ 0, %inner.body.rhs ], [ %[[PHI0]], %inner.header ]
52 ; CHECK-NEXT: br i1 %{{[^,]+}}, label %inner.exit, label %inner.header
57 ; CHECK-NEXT: %[[INNER_LCSSA:[^,]+]] = phi i32 [ %[[PHI1]], %inner.latch ]
58 ; CHECK-NEXT: br label %outer.latch
61 br i1 undef, label %outer.exit, label %outer.header
63 ; CHECK-NEXT: %[[PHI2:[^,]+]] = phi i32 [ %[[INNER_LCSSA]], %inner.exit ], [ 0, %outer.header ]
64 ; CHECK-NEXT: br i1 {{.*}}, label %outer.exit, label %outer.header
69 ; CHECK-NEXT: %[[OUTER_LCSSA:[^,]+]] = phi i32 [ %[[PHI2]], %outer.latch ]
70 ; CHECK-NEXT: store i32 %[[OUTER_LCSSA]]
71 ; CHECK-NEXT: br label %return