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
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
; https://bugs.llvm.org/show_bug.cgi?id=38123
; Pattern:
; x & ((-1 << y) >> y) != x
; Should be transformed into:
; x u> ((-1 << y) >> y)
; This pattern is uncanonical, but we can not canonicalize it due to extra uses.
declare void @use8(i8)
declare void @use2i8(<2 x i8>)
declare void @use3i8(<3 x i8>)
; ============================================================================ ;
; Basic positive tests
; ============================================================================ ;
define i1 @p0(i8 %x, i8 %y) {
; CHECK-LABEL: @p0(
; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]]
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i8 [[T1]], [[X:%.*]]
; CHECK-NEXT: ret i1 [[TMP1]]
;
%t0 = shl i8 -1, %y
call void @use8(i8 %t0)
%t1 = lshr i8 %t0, %y
%t2 = and i8 %t1, %x
%ret = icmp ne i8 %t2, %x
ret i1 %ret
}
; ============================================================================ ;
; Vector tests
; ============================================================================ ;
define <2 x i1> @p1_vec(<2 x i8> %x, <2 x i8> %y) {
; CHECK-LABEL: @p1_vec(
; CHECK-NEXT: [[T0:%.*]] = shl <2 x i8> <i8 -1, i8 -1>, [[Y:%.*]]
; CHECK-NEXT: call void @use2i8(<2 x i8> [[T0]])
; CHECK-NEXT: [[T1:%.*]] = lshr <2 x i8> [[T0]], [[Y]]
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult <2 x i8> [[T1]], [[X:%.*]]
; CHECK-NEXT: ret <2 x i1> [[TMP1]]
;
%t0 = shl <2 x i8> <i8 -1, i8 -1>, %y
call void @use2i8(<2 x i8> %t0)
%t1 = lshr <2 x i8> %t0, %y
%t2 = and <2 x i8> %t1, %x
%ret = icmp ne <2 x i8> %t2, %x
ret <2 x i1> %ret
}
define <3 x i1> @p2_vec_undef0(<3 x i8> %x, <3 x i8> %y) {
; CHECK-LABEL: @p2_vec_undef0(
; CHECK-NEXT: [[T0:%.*]] = shl <3 x i8> <i8 -1, i8 undef, i8 -1>, [[Y:%.*]]
; CHECK-NEXT: call void @use3i8(<3 x i8> [[T0]])
; CHECK-NEXT: [[T1:%.*]] = lshr <3 x i8> [[T0]], [[Y]]
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult <3 x i8> [[T1]], [[X:%.*]]
; CHECK-NEXT: ret <3 x i1> [[TMP1]]
;
%t0 = shl <3 x i8> <i8 -1, i8 undef, i8 -1>, %y
call void @use3i8(<3 x i8> %t0)
%t1 = lshr <3 x i8> %t0, %y
%t2 = and <3 x i8> %t1, %x
%ret = icmp ne <3 x i8> %t2, %x
ret <3 x i1> %ret
}
; ============================================================================ ;
; Commutativity tests.
; ============================================================================ ;
declare i8 @gen8()
define i1 @c0(i8 %y) {
; CHECK-LABEL: @c0(
; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]]
; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i8 [[X]], [[T1]]
; CHECK-NEXT: ret i1 [[TMP1]]
;
%t0 = shl i8 -1, %y
call void @use8(i8 %t0)
%t1 = lshr i8 %t0, %y
%x = call i8 @gen8()
%t2 = and i8 %x, %t1 ; swapped order
%ret = icmp ne i8 %t2, %x
ret i1 %ret
}
define i1 @c1(i8 %y) {
; CHECK-LABEL: @c1(
; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]]
; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i8 [[X]], [[T1]]
; CHECK-NEXT: ret i1 [[TMP1]]
;
%t0 = shl i8 -1, %y
call void @use8(i8 %t0)
%t1 = lshr i8 %t0, %y
%x = call i8 @gen8()
%t2 = and i8 %t1, %x
%ret = icmp ne i8 %x, %t2 ; swapped order
ret i1 %ret
}
define i1 @c2(i8 %y) {
; CHECK-LABEL: @c2(
; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]]
; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i8 [[X]], [[T1]]
; CHECK-NEXT: ret i1 [[TMP1]]
;
%t0 = shl i8 -1, %y
call void @use8(i8 %t0)
%t1 = lshr i8 %t0, %y
%x = call i8 @gen8()
%t2 = and i8 %x, %t1 ; swapped order
%ret = icmp ne i8 %x, %t2 ; swapped order
ret i1 %ret
}
; ============================================================================ ;
; One-use tests. We don't care about multi-uses here.
; ============================================================================ ;
define i1 @oneuse0(i8 %x, i8 %y) {
; CHECK-LABEL: @oneuse0(
; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]]
; CHECK-NEXT: call void @use8(i8 [[T1]])
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i8 [[T1]], [[X:%.*]]
; CHECK-NEXT: ret i1 [[TMP1]]
;
%t0 = shl i8 -1, %y
call void @use8(i8 %t0) ; needed anyway
%t1 = lshr i8 %t0, %y
call void @use8(i8 %t1)
%t2 = and i8 %t1, %x
%ret = icmp ne i8 %t2, %x
ret i1 %ret
}
define i1 @oneuse1(i8 %x, i8 %y) {
; CHECK-LABEL: @oneuse1(
; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]]
; CHECK-NEXT: [[T2:%.*]] = and i8 [[T1]], [[X:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T2]])
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i8 [[T1]], [[X]]
; CHECK-NEXT: ret i1 [[TMP1]]
;
%t0 = shl i8 -1, %y
call void @use8(i8 %t0) ; needed anyway
%t1 = lshr i8 %t0, %y
%t2 = and i8 %t1, %x
call void @use8(i8 %t2)
%ret = icmp ne i8 %t2, %x
ret i1 %ret
}
define i1 @oneuse2(i8 %x, i8 %y) {
; CHECK-LABEL: @oneuse2(
; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]]
; CHECK-NEXT: call void @use8(i8 [[T1]])
; CHECK-NEXT: [[T2:%.*]] = and i8 [[T1]], [[X:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T2]])
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i8 [[T1]], [[X]]
; CHECK-NEXT: ret i1 [[TMP1]]
;
%t0 = shl i8 -1, %y
call void @use8(i8 %t0)
%t1 = lshr i8 %t0, %y
call void @use8(i8 %t1)
%t2 = and i8 %t1, %x
call void @use8(i8 %t2)
%ret = icmp ne i8 %t2, %x
ret i1 %ret
}
; ============================================================================ ;
; Negative tests
; ============================================================================ ;
define i1 @n0(i8 %x, i8 %y, i8 %notx) {
; CHECK-LABEL: @n0(
; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y]]
; CHECK-NEXT: [[T2:%.*]] = and i8 [[T1]], [[X:%.*]]
; CHECK-NEXT: [[RET:%.*]] = icmp ne i8 [[T2]], [[NOTX:%.*]]
; CHECK-NEXT: ret i1 [[RET]]
;
%t0 = shl i8 -1, %y
call void @use8(i8 %t0)
%t1 = lshr i8 %t0, %y
%t2 = and i8 %t1, %x
%ret = icmp ne i8 %t2, %notx ; not %x
ret i1 %ret
}
define i1 @n1(i8 %x, i8 %y) {
; CHECK-LABEL: @n1(
; CHECK-NEXT: [[T0:%.*]] = shl nuw i8 1, [[Y:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i8 [[X:%.*]], 1
; CHECK-NEXT: ret i1 [[TMP1]]
;
%t0 = shl i8 1, %y ; not -1
call void @use8(i8 %t0)
%t1 = lshr i8 %t0, %y
%t2 = and i8 %t1, %x
%ret = icmp ne i8 %t2, %x
ret i1 %ret
}
define i1 @n2(i8 %x, i8 %y1, i8 %y2) {
; CHECK-LABEL: @n2(
; CHECK-NEXT: [[T0:%.*]] = shl i8 -1, [[Y1:%.*]]
; CHECK-NEXT: call void @use8(i8 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = lshr i8 [[T0]], [[Y2:%.*]]
; CHECK-NEXT: [[T2:%.*]] = and i8 [[T1]], [[X:%.*]]
; CHECK-NEXT: [[RET:%.*]] = icmp ne i8 [[T2]], [[X]]
; CHECK-NEXT: ret i1 [[RET]]
;
%t0 = shl i8 -1, %y1 ; not %y2
call void @use8(i8 %t0)
%t1 = lshr i8 %t0, %y2 ; not %y1
%t2 = and i8 %t1, %x
%ret = icmp ne i8 %t2, %x
ret i1 %ret
}
|