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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -S -passes=instcombine | FileCheck %s
@A = extern_weak global i32, align 4
@B = extern_weak global i32, align 4
define i32 @foo(i1 %which) {
; CHECK-LABEL: @foo(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[WHICH:%.*]], label [[FINAL:%.*]], label [[DELAY:%.*]]
; CHECK: delay:
; CHECK-NEXT: [[TMP0:%.*]] = select i1 icmp eq (ptr @A, ptr @B), i32 2, i32 1
; CHECK-NEXT: br label [[FINAL]]
; CHECK: final:
; CHECK-NEXT: [[USE2:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ [[TMP0]], [[DELAY]] ]
; CHECK-NEXT: ret i32 [[USE2]]
;
entry:
br i1 %which, label %final, label %delay
delay:
br label %final
final:
%use2 = phi i1 [ false, %entry ], [ icmp eq (ptr @A, ptr @B), %delay ]
%value = select i1 %use2, i32 2, i32 1
ret i32 %value
}
; test folding of select into phi for vectors.
define <4 x i64> @vec1(i1 %which) {
; CHECK-LABEL: @vec1(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[WHICH:%.*]], label [[FINAL:%.*]], label [[DELAY:%.*]]
; CHECK: delay:
; CHECK-NEXT: br label [[FINAL]]
; CHECK: final:
; CHECK-NEXT: [[PHINODE:%.*]] = phi <4 x i64> [ zeroinitializer, [[ENTRY:%.*]] ], [ <i64 0, i64 0, i64 126, i64 127>, [[DELAY]] ]
; CHECK-NEXT: ret <4 x i64> [[PHINODE]]
;
entry:
br i1 %which, label %final, label %delay
delay:
br label %final
final:
%phinode = phi <4 x i1> [ <i1 true, i1 true, i1 true, i1 true>, %entry ], [ <i1 true, i1 true, i1 false, i1 false>, %delay ]
%sel = select <4 x i1> %phinode, <4 x i64> zeroinitializer, <4 x i64> <i64 124, i64 125, i64 126, i64 127>
ret <4 x i64> %sel
}
define <4 x i64> @vec2(i1 %which) {
; CHECK-LABEL: @vec2(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[WHICH:%.*]], label [[FINAL:%.*]], label [[DELAY:%.*]]
; CHECK: delay:
; CHECK-NEXT: br label [[FINAL]]
; CHECK: final:
; CHECK-NEXT: [[PHINODE:%.*]] = phi <4 x i64> [ <i64 124, i64 125, i64 126, i64 127>, [[ENTRY:%.*]] ], [ <i64 0, i64 125, i64 0, i64 127>, [[DELAY]] ]
; CHECK-NEXT: ret <4 x i64> [[PHINODE]]
;
entry:
br i1 %which, label %final, label %delay
delay:
br label %final
final:
%phinode = phi <4 x i1> [ <i1 false, i1 false, i1 false, i1 false>, %entry ], [ <i1 true, i1 false, i1 true, i1 false>, %delay ]
%sel = select <4 x i1> %phinode, <4 x i64> zeroinitializer, <4 x i64> <i64 124, i64 125, i64 126, i64 127>
ret <4 x i64> %sel
}
; Test PR33364
; Insert the generated select into the same block as the incoming phi value.
; phi has constant vectors along with a single non-constant vector as operands.
define <2 x i8> @vec3(i1 %cond1, i1 %cond2, <2 x i1> %x, <2 x i8> %y, <2 x i8> %z) {
; CHECK-LABEL: @vec3(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[COND1:%.*]], label [[IF1:%.*]], label [[ELSE:%.*]]
; CHECK: if1:
; CHECK-NEXT: br i1 [[COND2:%.*]], label [[IF2:%.*]], label [[ELSE]]
; CHECK: if2:
; CHECK-NEXT: br label [[ELSE]]
; CHECK: else:
; CHECK-NEXT: [[PHI:%.*]] = phi <2 x i1> [ [[X:%.*]], [[IF2]] ], [ <i1 false, i1 true>, [[ENTRY:%.*]] ], [ <i1 true, i1 false>, [[IF1]] ]
; CHECK-NEXT: [[SEL:%.*]] = select <2 x i1> [[PHI]], <2 x i8> [[Y:%.*]], <2 x i8> [[Z:%.*]]
; CHECK-NEXT: ret <2 x i8> [[SEL]]
;
entry:
br i1 %cond1, label %if1, label %else
if1:
br i1 %cond2, label %if2, label %else
if2:
br label %else
else:
%phi = phi <2 x i1> [ %x, %if2 ], [ <i1 0, i1 1>, %entry ], [ <i1 1, i1 0>, %if1 ]
%sel = select <2 x i1> %phi, <2 x i8> %y, <2 x i8> %z
ret <2 x i8> %sel
}
; Don't crash on unreachable IR.
define void @PR48369(i32 %a, ptr %p) {
; CHECK-LABEL: @PR48369(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[PHI_CMP:%.*]] = icmp sgt i32 [[A:%.*]], 0
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[CMP:%.*]] = phi i1 [ [[PHI_CMP]], [[DEADBB:%.*]] ], [ true, [[ENTRY:%.*]] ]
; CHECK-NEXT: [[SHL:%.*]] = select i1 [[CMP]], i32 256, i32 0
; CHECK-NEXT: store i32 [[SHL]], ptr [[P:%.*]], align 4
; CHECK-NEXT: br label [[END:%.*]]
; CHECK: deadbb:
; CHECK-NEXT: br label [[BB1]]
; CHECK: end:
; CHECK-NEXT: ret void
;
entry:
%phi.cmp = icmp sgt i32 %a, 0
br label %bb1
bb1:
%cmp = phi i1 [ %phi.cmp, %deadbb ], [ true, %entry ]
%shl = select i1 %cmp, i32 256, i32 0
store i32 %shl, ptr %p
br label %end
deadbb:
br label %bb1
end:
ret void
}
define i16 @sink_to_unreachable_crash(i1 %a) {
; CHECK-LABEL: @sink_to_unreachable_crash(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[S:%.*]] = select i1 [[A:%.*]], i16 0, i16 5
; CHECK-NEXT: br label [[INF_LOOP:%.*]]
; CHECK: inf_loop:
; CHECK-NEXT: br label [[INF_LOOP]]
; CHECK: unreachable:
; CHECK-NEXT: ret i16 [[S]]
;
entry:
%s = select i1 %a, i16 0, i16 5
br label %inf_loop
inf_loop:
br label %inf_loop
unreachable: ; No predecessors!
ret i16 %s
}
define i32 @phi_trans(i1 %c, i1 %c2, i32 %v) {
; CHECK-LABEL: @phi_trans(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK: if:
; CHECK-NEXT: [[V2:%.*]] = add i32 [[V:%.*]], 1
; CHECK-NEXT: br label [[JOIN:%.*]]
; CHECK: else:
; CHECK-NEXT: [[V3:%.*]] = mul i32 [[V]], 3
; CHECK-NEXT: [[V5:%.*]] = lshr i32 [[V]], 1
; CHECK-NEXT: [[TMP0:%.*]] = select i1 [[C2:%.*]], i32 [[V3]], i32 [[V5]]
; CHECK-NEXT: br label [[JOIN]]
; CHECK: join:
; CHECK-NEXT: [[PHI1:%.*]] = phi i32 [ [[V2]], [[IF]] ], [ [[TMP0]], [[ELSE]] ]
; CHECK-NEXT: ret i32 [[PHI1]]
;
entry:
br i1 %c, label %if, label %else
if:
%v2 = add i32 %v, 1
%v4 = shl i32 %v, 1
br label %join
else:
%v3 = mul i32 %v, 3
%v5 = lshr i32 %v, 1
br label %join
join:
%phi1 = phi i1 [ true, %if ], [ %c2, %else ]
%phi2 = phi i32 [ %v2, %if ], [ %v3, %else ]
%phi3 = phi i32 [ %v4, %if ], [ %v5, %else ]
%sel = select i1 %phi1, i32 %phi2, i32 %phi3
ret i32 %sel
}
|
