1; RUN: opt -indvars -S %s -o - | FileCheck %s
2
3; When bailing out in rewriteLoopExitValues() you would be left with a PHI node
4; that was not deleted, and the IndVar pass would return an incorrect modified
5; status. This was caught by the expensive check introduced in D86589.
6
7; CHECK-LABEL: header:
8; CHECK-NEXT: %idx = phi i64 [ %idx.next, %latch ], [ undef, %entry ]
9; CHECK-NEXT: %cond = icmp sgt i64 %n, %idx
10; CHECK-NEXT: br i1 %cond, label %end, label %inner.preheader
11
12; CHECK-LABEL: latch:
13; CHECK-NEXT: %idx.next = add nsw i64 %idx, -1
14; CHECK-NEXT: br label %header
15
16target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
17target triple = "x86_64-unknown-linux-gnu"
18
19@ptr = external global i64
20
21define dso_local void @hoge() local_unnamed_addr {
22entry:                                            ; preds = %entry
23  %n = sdiv exact i64 undef, 40
24  br label %header
25
26header:                                           ; preds = %latch, %entry
27  %idx = phi i64 [ %idx.next, %latch ], [ undef, %entry ]
28  %cond = icmp sgt i64 %n, %idx
29  br i1 %cond, label %end, label %inner
30
31inner:                                            ; preds = %inner, %header
32  %i = phi i64 [ %i.next, %inner ], [ 0, %header ]
33  %j = phi i64 [ %j.next, %inner ], [ %n, %header ]
34  %i.next = add nsw i64 %i, 1
35  %j.next = add nsw i64 %j, 1
36  store i64 undef, i64* @ptr
37  %cond1 = icmp slt i64 %j, %idx
38  br i1 %cond1, label %inner, label %inner_exit
39
40inner_exit:                                       ; preds = %inner
41  %indvar = phi i64 [ %i.next, %inner ]
42  %indvar_use = add i64 %indvar, 1
43  br label %latch
44
45latch:                                            ; preds = %inner_exit
46  %idx.next = add nsw i64 %idx, -1
47  br label %header
48
49end:                                              ; preds = %header
50  ret void
51}
52