1 ; RUN: opt < %s -indvars -S | FileCheck %s
3 ; Make sure IndVars preserves LCSSA form, especially across loop nests.
5 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
7 define void @PR18642(i32 %x) {
8 ; CHECK-LABEL: @PR18642(
10 br label %outer.header
11 ; CHECK: br label %outer.header
14 ; CHECK: outer.header:
15 %outer.iv = phi i32 [ 0, %entry ], [ %x, %outer.latch ]
16 br label %inner.header
17 ; CHECK: %[[SCEV_EXPANDED:.*]] = add i32
18 ; CHECK: br label %inner.header
21 ; CHECK: inner.header:
22 %inner.iv = phi i32 [ undef, %outer.header ], [ %inc, %inner.latch ]
23 %cmp1 = icmp slt i32 %inner.iv, %outer.iv
24 br i1 %cmp1, label %inner.latch, label %outer.latch
25 ; CHECK: br i1 {{.*}}, label %inner.latch, label %outer.latch
29 %inc = add nsw i32 %inner.iv, 1
30 %cmp2 = icmp slt i32 %inner.iv, %outer.iv
31 br i1 %cmp2, label %inner.header, label %exit
32 ; CHECK: br i1 {{.*}}, label %inner.header, label %[[EXIT_FROM_INNER:.*]]
36 br i1 undef, label %outer.header, label %exit
37 ; CHECK: br i1 {{.*}}, label %outer.header, label %[[EXIT_FROM_OUTER:.*]]
39 ; CHECK: [[EXIT_FROM_INNER]]:
40 ; CHECK-NEXT: %[[LCSSA:.*]] = phi i32 [ %[[SCEV_EXPANDED]], %inner.latch ]
41 ; CHECK-NEXT: br label %exit
43 ; CHECK: [[EXIT_FROM_OUTER]]:
44 ; CHECK-NEXT: br label %exit
48 %exit.phi = phi i32 [ %inc, %inner.latch ], [ undef, %outer.latch ]
49 ; CHECK-NEXT: phi i32 [ %[[LCSSA]], %[[EXIT_FROM_INNER]] ], [ undef, %[[EXIT_FROM_OUTER]] ]