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
| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
; icmp u/s (a ^ signmask), (b ^ signmask) --> icmp s/u a, b
define i1 @slt_to_ult(i8 %x, i8 %y) {
; CHECK-LABEL: @slt_to_ult(
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i8 %x, %y
; CHECK-NEXT: ret i1 [[CMP]]
;
%a = xor i8 %x, 128
%b = xor i8 %y, 128
%cmp = icmp slt i8 %a, %b
ret i1 %cmp
}
; PR33138 - https://bugs.llvm.org/show_bug.cgi?id=33138
define <2 x i1> @slt_to_ult_splat(<2 x i8> %x, <2 x i8> %y) {
; CHECK-LABEL: @slt_to_ult_splat(
; CHECK-NEXT: [[CMP:%.*]] = icmp ult <2 x i8> %x, %y
; CHECK-NEXT: ret <2 x i1> [[CMP]]
;
%a = xor <2 x i8> %x, <i8 128, i8 128>
%b = xor <2 x i8> %y, <i8 128, i8 128>
%cmp = icmp slt <2 x i8> %a, %b
ret <2 x i1> %cmp
}
; Make sure that unsigned -> signed works too.
define i1 @ult_to_slt(i8 %x, i8 %y) {
; CHECK-LABEL: @ult_to_slt(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 %x, %y
; CHECK-NEXT: ret i1 [[CMP]]
;
%a = xor i8 %x, 128
%b = xor i8 %y, 128
%cmp = icmp ult i8 %a, %b
ret i1 %cmp
}
define <2 x i1> @ult_to_slt_splat(<2 x i8> %x, <2 x i8> %y) {
; CHECK-LABEL: @ult_to_slt_splat(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt <2 x i8> %x, %y
; CHECK-NEXT: ret <2 x i1> [[CMP]]
;
%a = xor <2 x i8> %x, <i8 128, i8 128>
%b = xor <2 x i8> %y, <i8 128, i8 128>
%cmp = icmp ult <2 x i8> %a, %b
ret <2 x i1> %cmp
}
; icmp u/s (a ^ maxsignval), (b ^ maxsignval) --> icmp s/u' a, b
define i1 @slt_to_ugt(i8 %x, i8 %y) {
; CHECK-LABEL: @slt_to_ugt(
; CHECK-NEXT: [[CMP:%.*]] = icmp ugt i8 %x, %y
; CHECK-NEXT: ret i1 [[CMP]]
;
%a = xor i8 %x, 127
%b = xor i8 %y, 127
%cmp = icmp slt i8 %a, %b
ret i1 %cmp
}
define <2 x i1> @slt_to_ugt_splat(<2 x i8> %x, <2 x i8> %y) {
; CHECK-LABEL: @slt_to_ugt_splat(
; CHECK-NEXT: [[CMP:%.*]] = icmp ugt <2 x i8> %x, %y
; CHECK-NEXT: ret <2 x i1> [[CMP]]
;
%a = xor <2 x i8> %x, <i8 127, i8 127>
%b = xor <2 x i8> %y, <i8 127, i8 127>
%cmp = icmp slt <2 x i8> %a, %b
ret <2 x i1> %cmp
}
; Make sure that unsigned -> signed works too.
define i1 @ult_to_sgt(i8 %x, i8 %y) {
; CHECK-LABEL: @ult_to_sgt(
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i8 %x, %y
; CHECK-NEXT: ret i1 [[CMP]]
;
%a = xor i8 %x, 127
%b = xor i8 %y, 127
%cmp = icmp ult i8 %a, %b
ret i1 %cmp
}
define <2 x i1> @ult_to_sgt_splat(<2 x i8> %x, <2 x i8> %y) {
; CHECK-LABEL: @ult_to_sgt_splat(
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt <2 x i8> %x, %y
; CHECK-NEXT: ret <2 x i1> [[CMP]]
;
%a = xor <2 x i8> %x, <i8 127, i8 127>
%b = xor <2 x i8> %y, <i8 127, i8 127>
%cmp = icmp ult <2 x i8> %a, %b
ret <2 x i1> %cmp
}
; icmp u/s (a ^ signmask), C --> icmp s/u a, C'
define i1 @sge_to_ugt(i8 %x) {
; CHECK-LABEL: @sge_to_ugt(
; CHECK-NEXT: [[CMP:%.*]] = icmp ugt i8 %x, -114
; CHECK-NEXT: ret i1 [[CMP]]
;
%a = xor i8 %x, 128
%cmp = icmp sge i8 %a, 15
ret i1 %cmp
}
define <2 x i1> @sge_to_ugt_splat(<2 x i8> %x) {
; CHECK-LABEL: @sge_to_ugt_splat(
; CHECK-NEXT: [[CMP:%.*]] = icmp ugt <2 x i8> %x, <i8 -114, i8 -114>
; CHECK-NEXT: ret <2 x i1> [[CMP]]
;
%a = xor <2 x i8> %x, <i8 128, i8 128>
%cmp = icmp sge <2 x i8> %a, <i8 15, i8 15>
ret <2 x i1> %cmp
}
; Make sure that unsigned -> signed works too.
define i1 @uge_to_sgt(i8 %x) {
; CHECK-LABEL: @uge_to_sgt(
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i8 %x, -114
; CHECK-NEXT: ret i1 [[CMP]]
;
%a = xor i8 %x, 128
%cmp = icmp uge i8 %a, 15
ret i1 %cmp
}
define <2 x i1> @uge_to_sgt_splat(<2 x i8> %x) {
; CHECK-LABEL: @uge_to_sgt_splat(
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt <2 x i8> %x, <i8 -114, i8 -114>
; CHECK-NEXT: ret <2 x i1> [[CMP]]
;
%a = xor <2 x i8> %x, <i8 128, i8 128>
%cmp = icmp uge <2 x i8> %a, <i8 15, i8 15>
ret <2 x i1> %cmp
}
; icmp u/s (a ^ maxsignval), C --> icmp s/u' a, C'
define i1 @sge_to_ult(i8 %x) {
; CHECK-LABEL: @sge_to_ult(
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i8 %x, 113
; CHECK-NEXT: ret i1 [[CMP]]
;
%a = xor i8 %x, 127
%cmp = icmp sge i8 %a, 15
ret i1 %cmp
}
define <2 x i1> @sge_to_ult_splat(<2 x i8> %x) {
; CHECK-LABEL: @sge_to_ult_splat(
; CHECK-NEXT: [[CMP:%.*]] = icmp ult <2 x i8> %x, <i8 113, i8 113>
; CHECK-NEXT: ret <2 x i1> [[CMP]]
;
%a = xor <2 x i8> %x, <i8 127, i8 127>
%cmp = icmp sge <2 x i8> %a, <i8 15, i8 15>
ret <2 x i1> %cmp
}
; Make sure that unsigned -> signed works too.
define i1 @uge_to_slt(i8 %x) {
; CHECK-LABEL: @uge_to_slt(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 %x, 113
; CHECK-NEXT: ret i1 [[CMP]]
;
%a = xor i8 %x, 127
%cmp = icmp uge i8 %a, 15
ret i1 %cmp
}
define <2 x i1> @uge_to_slt_splat(<2 x i8> %x) {
; CHECK-LABEL: @uge_to_slt_splat(
; CHECK-NEXT: [[CMP:%.*]] = icmp slt <2 x i8> %x, <i8 113, i8 113>
; CHECK-NEXT: ret <2 x i1> [[CMP]]
;
%a = xor <2 x i8> %x, <i8 127, i8 127>
%cmp = icmp uge <2 x i8> %a, <i8 15, i8 15>
ret <2 x i1> %cmp
}
; PR33138, part 2: https://bugs.llvm.org/show_bug.cgi?id=33138
; Bitcast canonicalization ensures that we recognize the signbit constant.
define <8 x i1> @sgt_to_ugt_bitcasted_splat(<2 x i32> %x, <2 x i32> %y) {
; CHECK-LABEL: @sgt_to_ugt_bitcasted_splat(
; CHECK-NEXT: [[TMP1:%.*]] = bitcast <2 x i32> %x to <8 x i8>
; CHECK-NEXT: [[TMP2:%.*]] = bitcast <2 x i32> %y to <8 x i8>
; CHECK-NEXT: [[E:%.*]] = icmp ugt <8 x i8> [[TMP1]], [[TMP2]]
; CHECK-NEXT: ret <8 x i1> [[E]]
;
%a = xor <2 x i32> %x, <i32 2155905152, i32 2155905152> ; 0x80808080
%b = xor <2 x i32> %y, <i32 2155905152, i32 2155905152>
%c = bitcast <2 x i32> %a to <8 x i8>
%d = bitcast <2 x i32> %b to <8 x i8>
%e = icmp sgt <8 x i8> %c, %d
ret <8 x i1> %e
}
; Bitcast canonicalization ensures that we recognize the signbit constant.
define <2 x i1> @negative_simplify_splat(<4 x i8> %x) {
; CHECK-LABEL: @negative_simplify_splat(
; CHECK-NEXT: ret <2 x i1> zeroinitializer
;
%a = or <4 x i8> %x, <i8 0, i8 128, i8 0, i8 128>
%b = bitcast <4 x i8> %a to <2 x i16>
%c = icmp sgt <2 x i16> %b, zeroinitializer
ret <2 x i1> %c
}
|