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
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s
declare i1 @cond()
declare void @clobber()
define void @test_unreachable_latch(ptr %start, ptr %b) {
; CHECK-LABEL: define void @test_unreachable_latch
; CHECK-SAME: (ptr [[START:%.*]], ptr [[B:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
; CHECK: loop.header:
; CHECK-NEXT: [[NODE_1:%.*]] = phi ptr [ [[START]], [[ENTRY:%.*]] ], [ null, [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT: [[C_0:%.*]] = icmp ne ptr [[NODE_1]], null
; CHECK-NEXT: br i1 [[C_0]], label [[THEN:%.*]], label [[EXIT:%.*]]
; CHECK: loop.latch:
; CHECK-NEXT: call void @clobber()
; CHECK-NEXT: br label [[LOOP_HEADER]]
; CHECK: if:
; CHECK-NEXT: [[C_2:%.*]] = icmp ne ptr [[B]], null
; CHECK-NEXT: [[AND:%.*]] = and i1 [[C_2]], [[C_0]]
; CHECK-NEXT: br i1 [[AND]], label [[THEN]], label [[EXIT]]
; CHECK: then:
; CHECK-NEXT: call void @clobber()
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret void
;
entry:
br label %loop.header
loop.header:
%node.1 = phi ptr [ %start, %entry ], [ null, %loop.latch ]
%c.0 = icmp ne ptr %node.1, null
br i1 %c.0, label %then, label %exit
loop.latch: ; No predecessors!
call void @clobber()
br label %loop.header
if:
%c.2 = icmp ne ptr %b, null
%and = and i1 %c.2, %c.0
br i1 %and, label %then, label %exit
then:
call void @clobber()
br label %exit
exit:
ret void
}
define void @test_cond_multi_use_with_one_use_simplified_before_adding_ne_fact(ptr %start, ptr %b) {
; CHECK-LABEL: define void @test_cond_multi_use_with_one_use_simplified_before_adding_ne_fact
; CHECK-SAME: (ptr [[START:%.*]], ptr [[B:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
; CHECK: loop.header:
; CHECK-NEXT: [[NODE_1:%.*]] = phi ptr [ [[START]], [[ENTRY:%.*]] ], [ null, [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT: [[C_0:%.*]] = icmp ne ptr [[NODE_1]], null
; CHECK-NEXT: br i1 [[C_0]], label [[LOOP_LATCH]], label [[EXIT:%.*]]
; CHECK: loop.latch:
; CHECK-NEXT: [[C_1:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[C_1]], label [[IF:%.*]], label [[LOOP_HEADER]]
; CHECK: if:
; CHECK-NEXT: [[C_2:%.*]] = icmp ne ptr [[B]], null
; CHECK-NEXT: [[AND:%.*]] = and i1 [[C_2]], true
; CHECK-NEXT: br i1 [[AND]], label [[THEN:%.*]], label [[EXIT]]
; CHECK: then:
; CHECK-NEXT: call void @clobber()
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret void
;
entry:
br label %loop.header
loop.header:
%node.1 = phi ptr [ %start, %entry ], [ null, %loop.latch ]
%c.0 = icmp ne ptr %node.1, null
br i1 %c.0, label %loop.latch, label %exit
loop.latch:
%c.1 = call i1 @cond()
br i1 %c.1, label %if, label %loop.header
if:
%c.2 = icmp ne ptr %b, null
%and = and i1 %c.2, %c.0
br i1 %and, label %then, label %exit
then:
call void @clobber()
br label %exit
exit:
ret void
}
|
