1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=loop-reduce,loop-term-fold -S | FileCheck %s
; This test used to crash due to matchSimpleRecurrence matching the simple
; recurrence in pn-loop when evaluating unrelated-loop. Since unrelated-loop
; cannot jump to pn-node isAlmostDeadIV panics.
define void @phi_node_different_bb() {
; CHECK-LABEL: @phi_node_different_bb(
; CHECK-NEXT: br label [[PN_LOOP:%.*]]
; CHECK: pn-loop:
; CHECK-NEXT: [[TMP1:%.*]] = phi i32 [ 1, [[TMP0:%.*]] ], [ [[TMP2:%.*]], [[PN_LOOP]] ]
; CHECK-NEXT: [[TMP2]] = add i32 [[TMP1]], 1
; CHECK-NEXT: [[TMP3:%.*]] = icmp ugt i32 [[TMP2]], 1
; CHECK-NEXT: br i1 [[TMP3]], label [[PN_LOOP]], label [[UNRELATED_LOOP_PREHEADER:%.*]]
; CHECK: unrelated-loop.preheader:
; CHECK-NEXT: [[DOTLCSSA:%.*]] = phi i32 [ [[TMP2]], [[PN_LOOP]] ]
; CHECK-NEXT: br label [[UNRELATED_LOOP:%.*]]
; CHECK: unrelated-loop:
; CHECK-NEXT: [[TMP4:%.*]] = icmp eq i32 [[DOTLCSSA]], 0
; CHECK-NEXT: br i1 [[TMP4]], label [[END:%.*]], label [[UNRELATED_LOOP]]
; CHECK: end:
; CHECK-NEXT: ret void
;
br label %pn-loop
pn-loop: ; preds = %pn-loop, %0
%1 = phi i32 [ 1, %0 ], [ %2, %pn-loop ]
%2 = add i32 %1, 1
%3 = icmp ugt i32 %2, 1
br i1 %3, label %pn-loop, label %unrelated-loop.preheader
unrelated-loop.preheader: ; preds = %pn-loop
br label %unrelated-loop
unrelated-loop: ; preds = %unrelated-loop, %unrelated-loop.preheader
%4 = icmp eq i32 %2, 0
br i1 %4, label %end, label %unrelated-loop
end: ; preds = %unrelated-loop
ret void
}
|
