File: edge.ll

package info (click to toggle)
llvm-toolchain-5.0 1:5.0.1-2~bpo9+1
  • links: PTS, VCS
  • area: main
  • in suites: stretch-backports
  • size: 553,688 kB
  • sloc: cpp: 2,878,786; ansic: 584,110; asm: 246,252; python: 124,751; objc: 106,925; sh: 21,542; lisp: 8,628; pascal: 5,885; ml: 5,544; perl: 5,312; makefile: 2,208; cs: 2,022; xml: 686; php: 212; csh: 117
file content (174 lines) | stat: -rw-r--r-- 4,007 bytes parent folder | download | duplicates (17)
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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
; RUN: opt -early-cse -S < %s | FileCheck %s
; RUN: opt -basicaa -early-cse-memssa -S < %s | FileCheck %s
; Same as GVN/edge.ll, but updated to reflect EarlyCSE's less powerful
; implementation.  EarlyCSE currently doesn't exploit equality comparisons
; against constants.

define i32 @f1(i32 %x) {
  ; CHECK-LABEL: define i32 @f1(
bb0:
  %cmp = icmp eq i32 %x, 0
  br i1 %cmp, label %bb2, label %bb1
bb1:
  br label %bb2
bb2:
  %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
  %foo = add i32 %cond, %x
  ret i32 %foo
  ; CHECK: bb2:
  ; CHECK: %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
}

define i32 @f2(i32 %x) {
  ; CHECK-LABEL: define i32 @f2(
bb0:
  %cmp = icmp ne i32 %x, 0
  br i1 %cmp, label %bb1, label %bb2
bb1:
  br label %bb2
bb2:
  %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
  %foo = add i32 %cond, %x
  ret i32 %foo
  ; CHECK: bb2:
  ; CHECK: %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
}

define i32 @f3(i32 %x) {
  ; CHECK-LABEL: define i32 @f3(
bb0:
  switch i32 %x, label %bb1 [ i32 0, label %bb2]
bb1:
  br label %bb2
bb2:
  %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
  %foo = add i32 %cond, %x
  ret i32 %foo
  ; CHECK: bb2:
  ; CHECK: %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
}

declare void @g(i1)
define void @f4(i8 * %x)  {
; CHECK-LABEL: define void @f4(
bb0:
  %y = icmp eq i8* null, %x
  br i1 %y, label %bb2, label %bb1
bb1:
  br label %bb2
bb2:
  %zed = icmp eq i8* null, %x
  call void @g(i1 %zed)
; CHECK: call void @g(i1 %y)
  ret void
}

define double @fcmp_oeq_not_zero(double %x, double %y) {
entry:
  %cmp = fcmp oeq double %y, 2.0
  br i1 %cmp, label %if, label %return

if:
  %div = fdiv double %x, %y
  br label %return

return:
  %retval = phi double [ %div, %if ], [ %x, %entry ]
  ret double %retval

; CHECK-LABEL: define double @fcmp_oeq_not_zero(
; CHECK: %div = fdiv double %x, %y
}

define double @fcmp_une_not_zero(double %x, double %y) {
entry:
  %cmp = fcmp une double %y, 2.0
  br i1 %cmp, label %return, label %else

else:
  %div = fdiv double %x, %y
  br label %return

return:
  %retval = phi double [ %div, %else ], [ %x, %entry ]
  ret double %retval

; CHECK-LABEL: define double @fcmp_une_not_zero(
; CHECK: %div = fdiv double %x, %y
}

; PR22376 - We can't propagate zero constants because -0.0 
; compares equal to 0.0. If %y is -0.0 in this test case,
; we would produce the wrong sign on the infinity return value.
define double @fcmp_oeq_zero(double %x, double %y) {
entry:
  %cmp = fcmp oeq double %y, 0.0
  br i1 %cmp, label %if, label %return

if:
  %div = fdiv double %x, %y
  br label %return

return:
  %retval = phi double [ %div, %if ], [ %x, %entry ]
  ret double %retval

; CHECK-LABEL: define double @fcmp_oeq_zero(
; CHECK: %div = fdiv double %x, %y
}

define double @fcmp_une_zero(double %x, double %y) {
entry:
  %cmp = fcmp une double %y, -0.0
  br i1 %cmp, label %return, label %else

else:
  %div = fdiv double %x, %y
  br label %return

return:
  %retval = phi double [ %div, %else ], [ %x, %entry ]
  ret double %retval

; CHECK-LABEL: define double @fcmp_une_zero(
; CHECK: %div = fdiv double %x, %y
}

; We also cannot propagate a value if it's not a constant.
; This is because the value could be 0.0 or -0.0.

define double @fcmp_oeq_maybe_zero(double %x, double %y, double %z1, double %z2) {
entry:
 %z = fadd double %z1, %z2
 %cmp = fcmp oeq double %y, %z
 br i1 %cmp, label %if, label %return

if:
 %div = fdiv double %x, %z
 br label %return

return:
 %retval = phi double [ %div, %if ], [ %x, %entry ]
 ret double %retval

; CHECK-LABEL: define double @fcmp_oeq_maybe_zero(
; CHECK: %div = fdiv double %x, %z
}

define double @fcmp_une_maybe_zero(double %x, double %y, double %z1, double %z2) {
entry:
 %z = fadd double %z1, %z2
 %cmp = fcmp une double %y, %z
 br i1 %cmp, label %return, label %else

else:
 %div = fdiv double %x, %z
 br label %return

return:
 %retval = phi double [ %div, %else ], [ %x, %entry ]
 ret double %retval

; CHECK-LABEL: define double @fcmp_une_maybe_zero(
; CHECK: %div = fdiv double %x, %z
}