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
| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
; https://bugs.llvm.org/show_bug.cgi?id=38123
; Pattern:
; x & C u>= x
; Should be transformed into:
; x u<= C
; Iff: isPowerOf2(C + 1)
; C can be 0 and -1.
; ============================================================================ ;
; Basic positive tests
; ============================================================================ ;
define i1 @p0(i8 %x) {
; CHECK-LABEL: @p0(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i8 [[X:%.*]], 4
; CHECK-NEXT: ret i1 [[TMP1]]
;
%tmp0 = and i8 %x, 3
%ret = icmp uge i8 %tmp0, %x
ret i1 %ret
}
define i1 @pv(i8 %x, i8 %y) {
; CHECK-LABEL: @pv(
; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
; CHECK-NEXT: [[TMP1:%.*]] = icmp uge i8 [[TMP0]], [[X:%.*]]
; CHECK-NEXT: ret i1 [[TMP1]]
;
%tmp0 = lshr i8 -1, %y
%tmp1 = and i8 %tmp0, %x
%ret = icmp uge i8 %tmp1, %x
ret i1 %ret
}
; ============================================================================ ;
; Vector tests
; ============================================================================ ;
define <2 x i1> @p1_vec_splat(<2 x i8> %x) {
; CHECK-LABEL: @p1_vec_splat(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult <2 x i8> [[X:%.*]], <i8 4, i8 4>
; CHECK-NEXT: ret <2 x i1> [[TMP1]]
;
%tmp0 = and <2 x i8> %x, <i8 3, i8 3>
%ret = icmp uge <2 x i8> %tmp0, %x
ret <2 x i1> %ret
}
define <2 x i1> @p2_vec_nonsplat(<2 x i8> %x) {
; CHECK-LABEL: @p2_vec_nonsplat(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult <2 x i8> [[X:%.*]], <i8 4, i8 16>
; CHECK-NEXT: ret <2 x i1> [[TMP1]]
;
%tmp0 = and <2 x i8> %x, <i8 3, i8 15> ; doesn't have to be splat.
%ret = icmp uge <2 x i8> %tmp0, %x
ret <2 x i1> %ret
}
define <2 x i1> @p2_vec_nonsplat_edgecase0(<2 x i8> %x) {
; CHECK-LABEL: @p2_vec_nonsplat_edgecase0(
; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X:%.*]], <i8 3, i8 0>
; CHECK-NEXT: [[RET:%.*]] = icmp uge <2 x i8> [[TMP0]], [[X]]
; CHECK-NEXT: ret <2 x i1> [[RET]]
;
%tmp0 = and <2 x i8> %x, <i8 3, i8 0>
%ret = icmp uge <2 x i8> %tmp0, %x
ret <2 x i1> %ret
}
define <2 x i1> @p2_vec_nonsplat_edgecase1(<2 x i8> %x) {
; CHECK-LABEL: @p2_vec_nonsplat_edgecase1(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ule <2 x i8> [[X:%.*]], <i8 3, i8 -1>
; CHECK-NEXT: ret <2 x i1> [[TMP1]]
;
%tmp0 = and <2 x i8> %x, <i8 3, i8 -1>
%ret = icmp uge <2 x i8> %tmp0, %x
ret <2 x i1> %ret
}
define <3 x i1> @p3_vec_splat_undef(<3 x i8> %x) {
; CHECK-LABEL: @p3_vec_splat_undef(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult <3 x i8> [[X:%.*]], <i8 4, i8 undef, i8 4>
; CHECK-NEXT: ret <3 x i1> [[TMP1]]
;
%tmp0 = and <3 x i8> %x, <i8 3, i8 undef, i8 3>
%ret = icmp uge <3 x i8> %tmp0, %x
ret <3 x i1> %ret
}
; ============================================================================ ;
; Commutativity tests.
; ============================================================================ ;
declare i8 @gen8()
; The pattern is not commutative. instsimplify will already take care of it.
define i1 @c0() {
; CHECK-LABEL: @c0(
; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
; CHECK-NEXT: ret i1 true
;
%x = call i8 @gen8()
%tmp0 = and i8 %x, 3
%ret = icmp uge i8 %x, %tmp0 ; swapped order
ret i1 %ret
}
; ============================================================================ ;
; Commutativity tests with variable
; ============================================================================ ;
define i1 @cv0(i8 %y) {
; CHECK-LABEL: @cv0(
; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
; CHECK-NEXT: [[TMP1:%.*]] = icmp ule i8 [[X]], [[TMP0]]
; CHECK-NEXT: ret i1 [[TMP1]]
;
%x = call i8 @gen8()
%tmp0 = lshr i8 -1, %y
%tmp1 = and i8 %x, %tmp0 ; swapped order
%ret = icmp uge i8 %tmp1, %x
ret i1 %ret
}
define i1 @cv1(i8 %y) {
; CHECK-LABEL: @cv1(
; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
; CHECK-NEXT: ret i1 true
;
%x = call i8 @gen8()
%tmp0 = lshr i8 -1, %y
%tmp1 = and i8 %tmp0, %x
%ret = icmp uge i8 %x, %tmp1 ; swapped order
ret i1 %ret
}
define i1 @cv2(i8 %y) {
; CHECK-LABEL: @cv2(
; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
; CHECK-NEXT: ret i1 true
;
%x = call i8 @gen8()
%tmp0 = lshr i8 -1, %y
%tmp1 = and i8 %x, %tmp0 ; swapped order
%ret = icmp uge i8 %x, %tmp1 ; swapped order
ret i1 %ret
}
; ============================================================================ ;
; One-use tests. We don't care about multi-uses here.
; ============================================================================ ;
declare void @use8(i8)
define i1 @oneuse0(i8 %x) {
; CHECK-LABEL: @oneuse0(
; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3
; CHECK-NEXT: call void @use8(i8 [[TMP0]])
; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i8 [[X]], 4
; CHECK-NEXT: ret i1 [[TMP1]]
;
%tmp0 = and i8 %x, 3
call void @use8(i8 %tmp0)
%ret = icmp uge i8 %tmp0, %x
ret i1 %ret
}
; ============================================================================ ;
; Negative tests
; ============================================================================ ;
define i1 @n0(i8 %x) {
; CHECK-LABEL: @n0(
; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 4
; CHECK-NEXT: [[RET:%.*]] = icmp uge i8 [[TMP0]], [[X]]
; CHECK-NEXT: ret i1 [[RET]]
;
%tmp0 = and i8 %x, 4 ; power-of-two, but invalid.
%ret = icmp uge i8 %tmp0, %x
ret i1 %ret
}
define i1 @n1(i8 %x, i8 %y, i8 %notx) {
; CHECK-LABEL: @n1(
; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3
; CHECK-NEXT: [[RET:%.*]] = icmp uge i8 [[TMP0]], [[NOTX:%.*]]
; CHECK-NEXT: ret i1 [[RET]]
;
%tmp0 = and i8 %x, 3
%ret = icmp uge i8 %tmp0, %notx ; not %x
ret i1 %ret
}
define <2 x i1> @n2(<2 x i8> %x) {
; CHECK-LABEL: @n2(
; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X:%.*]], <i8 3, i8 16>
; CHECK-NEXT: [[RET:%.*]] = icmp uge <2 x i8> [[TMP0]], [[X]]
; CHECK-NEXT: ret <2 x i1> [[RET]]
;
%tmp0 = and <2 x i8> %x, <i8 3, i8 16> ; only the first one is valid.
%ret = icmp uge <2 x i8> %tmp0, %x
ret <2 x i1> %ret
}
|