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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
; RUN: opt < %s -correlated-propagation -S | FileCheck %s
; CHECK-LABEL: @simple(
define i8 @simple(i1) {
entry:
%s = select i1 %0, i8 0, i8 1
br i1 %0, label %then, label %else
then:
; CHECK: ret i8 0
%a = phi i8 [ %s, %entry ]
ret i8 %a
else:
; CHECK: ret i8 1
%b = phi i8 [ %s, %entry ]
ret i8 %b
}
; CHECK-LABEL: @loop(
define void @loop(i32) {
entry:
br label %loop
loop:
%idx = phi i32 [ %0, %entry ], [ %sel, %loop ]
; CHECK: %idx = phi i32 [ %0, %entry ], [ %2, %loop ]
%1 = icmp eq i32 %idx, 0
%2 = add i32 %idx, -1
%sel = select i1 %1, i32 0, i32 %2
br i1 %1, label %out, label %loop
out:
ret void
}
; CHECK-LABEL: @not_correlated(
define i8 @not_correlated(i1, i1) {
entry:
%s = select i1 %0, i8 0, i8 1
br i1 %1, label %then, label %else
then:
; CHECK: ret i8 %s
%a = phi i8 [ %s, %entry ]
ret i8 %a
else:
; CHECK: ret i8 %s
%b = phi i8 [ %s, %entry ]
ret i8 %b
}
@c = global i32 0, align 4
@b = global i32 0, align 4
; CHECK-LABEL: @PR23752(
define i32 @PR23752() {
entry:
br label %for.body
for.body:
%phi = phi i32 [ 0, %entry ], [ %sel, %for.body ]
%sel = select i1 icmp sgt (i32* @b, i32* @c), i32 %phi, i32 1
%cmp = icmp ne i32 %sel, 1
br i1 %cmp, label %for.body, label %if.end
; CHECK: %[[sel:.*]] = select i1 icmp sgt (i32* @b, i32* @c), i32 0, i32 1
; CHECK-NEXT: %[[cmp:.*]] = icmp ne i32 %[[sel]], 1
; CHECK-NEXT: br i1 %[[cmp]]
if.end:
ret i32 %sel
; CHECK: ret i32 1
}
define i1 @test1(i32* %p, i1 %unknown) {
; CHECK-LABEL: @test1
%pval = load i32, i32* %p
%cmp1 = icmp slt i32 %pval, 255
br i1 %cmp1, label %next, label %exit
next:
%min = select i1 %unknown, i32 %pval, i32 5
;; TODO: This pointless branch shouldn't be neccessary
br label %next2
next2:
; CHECK-LABEL: next2:
; CHECK: ret i1 false
%res = icmp eq i32 %min, 255
ret i1 %res
exit:
; CHECK-LABEL: exit:
; CHECK: ret i1 true
ret i1 true
}
; Check that we take a conservative meet
define i1 @test2(i32* %p, i32 %qval, i1 %unknown) {
; CHECK-LABEL: test2
%pval = load i32, i32* %p
%cmp1 = icmp slt i32 %pval, 255
br i1 %cmp1, label %next, label %exit
next:
%min = select i1 %unknown, i32 %pval, i32 %qval
;; TODO: This pointless branch shouldn't be neccessary
br label %next2
next2:
; CHECK-LABEL: next2
; CHECK: ret i1 %res
%res = icmp eq i32 %min, 255
ret i1 %res
exit:
; CHECK-LABEL: exit:
; CHECK: ret i1 true
ret i1 true
}
; Same as @test2, but for the opposite select input
define i1 @test3(i32* %p, i32 %qval, i1 %unknown) {
; CHECK-LABEL: test3
%pval = load i32, i32* %p
%cmp1 = icmp slt i32 %pval, 255
br i1 %cmp1, label %next, label %exit
next:
%min = select i1 %unknown, i32 %qval, i32 %pval
;; TODO: This pointless branch shouldn't be neccessary
br label %next2
next2:
; CHECK-LABEL: next2
; CHECK: ret i1 %res
%res = icmp eq i32 %min, 255
ret i1 %res
exit:
; CHECK-LABEL: exit:
; CHECK: ret i1 true
ret i1 true
}
; Conflicting constants (i.e. isOverdefined result)
; NOTE: Using doubles in this version is a bit of a hack. This
; is to get around the fact that all integers (including constants
; and non-constants) are actually represented as constant-ranges.
define i1 @test4(i32* %p, i32 %qval, i1 %unknown) {
; CHECK-LABEL: test4
%pval = load i32, i32* %p
%cmp1 = icmp slt i32 %pval, 255
br i1 %cmp1, label %next, label %exit
next:
%min = select i1 %unknown, double 1.0, double 0.0
;; TODO: This pointless branch shouldn't be neccessary
br label %next2
next2:
; CHECK-LABEL: next2
; CHECK: ret i1 %res
%res = fcmp oeq double %min, 300.0
ret i1 %res
exit:
; CHECK-LABEL: exit:
; CHECK: ret i1 true
ret i1 true
}
;; Using the condition to clamp the result
;;
define i1 @test5(i32* %p, i1 %unknown) {
; CHECK-LABEL: @test5
%pval = load i32, i32* %p
%cmp1 = icmp slt i32 %pval, 255
br i1 %cmp1, label %next, label %exit
next:
%cond = icmp sgt i32 %pval, 0
%min = select i1 %cond, i32 %pval, i32 5
;; TODO: This pointless branch shouldn't be neccessary
br label %next2
next2:
; CHECK-LABEL: next2:
; CHECK: ret i1 false
%res = icmp eq i32 %min, -1
ret i1 %res
exit:
; CHECK-LABEL: exit:
; CHECK: ret i1 true
ret i1 true
}
define i1 @test6(i32* %p, i1 %unknown) {
; CHECK-LABEL: @test6
%pval = load i32, i32* %p
%cmp1 = icmp ult i32 %pval, 255
br i1 %cmp1, label %next, label %exit
next:
%cond = icmp ne i32 %pval, 254
%sel = select i1 %cond, i32 %pval, i32 1
;; TODO: This pointless branch shouldn't be neccessary
br label %next2
next2:
; CHECK-LABEL: next2:
; CHECK: ret i1 true
%res = icmp slt i32 %sel, 254
ret i1 %res
exit:
; CHECK-LABEL: exit:
; CHECK: ret i1 true
ret i1 true
}
|
