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
| ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s
; Vary the operand sizes for extra coverage, but the transform should be identical in all cases.
; (X == 0) ? 0 : -1 --> (X == 0) - 1
define i8 @i8_select_0_or_neg1(i8 %x) {
; CHECK-LABEL: i8_select_0_or_neg1:
; CHECK: # %bb.0:
; CHECK-NEXT: negb %dil
; CHECK-NEXT: sbbb %al, %al
; CHECK-NEXT: retq
%cmp = icmp eq i8 %x, 0
%sel = select i1 %cmp, i8 0, i8 -1
ret i8 %sel
}
; (X == 0) ? 0 : -1 --> (X == 0) - 1
define i16 @i16_select_0_or_neg1_as_math(i16 %x) {
; CHECK-LABEL: i16_select_0_or_neg1_as_math:
; CHECK: # %bb.0:
; CHECK-NEXT: negw %di
; CHECK-NEXT: sbbw %ax, %ax
; CHECK-NEXT: retq
%cmp = icmp eq i16 %x, 0
%ext = zext i1 %cmp to i16
%add = add i16 %ext, -1
ret i16 %add
}
; (X != 0) ? -1 : 0 --> 0 - (X != 0)
define i32 @i32_select_0_or_neg1_commuted(i32 %x) {
; CHECK-LABEL: i32_select_0_or_neg1_commuted:
; CHECK: # %bb.0:
; CHECK-NEXT: negl %edi
; CHECK-NEXT: sbbl %eax, %eax
; CHECK-NEXT: retq
%cmp = icmp ne i32 %x, 0
%sel = select i1 %cmp, i32 -1, i32 0
ret i32 %sel
}
; (X != 0) ? -1 : 0 --> 0 - (X != 0)
define i64 @i64_select_0_or_neg1_commuted_as_math(i64 %x) {
; CHECK-LABEL: i64_select_0_or_neg1_commuted_as_math:
; CHECK: # %bb.0:
; CHECK-NEXT: negq %rdi
; CHECK-NEXT: sbbq %rax, %rax
; CHECK-NEXT: retq
%cmp = icmp ne i64 %x, 0
%ext = zext i1 %cmp to i64
%sub = sub i64 0, %ext
ret i64 %sub
}
; (X == 0) ? -1 : 0 --> 0 - (X == 0)
define i64 @i64_select_neg1_or_0(i64 %x) {
; CHECK-LABEL: i64_select_neg1_or_0:
; CHECK: # %bb.0:
; CHECK-NEXT: cmpq $1, %rdi
; CHECK-NEXT: sbbq %rax, %rax
; CHECK-NEXT: retq
%cmp = icmp eq i64 %x, 0
%sel = select i1 %cmp, i64 -1, i64 0
ret i64 %sel
}
; (X == 0) ? -1 : 0 --> 0 - (X == 0)
define i32 @i32_select_neg1_or_0_as_math(i32 %x) {
; CHECK-LABEL: i32_select_neg1_or_0_as_math:
; CHECK: # %bb.0:
; CHECK-NEXT: cmpl $1, %edi
; CHECK-NEXT: sbbl %eax, %eax
; CHECK-NEXT: retq
%cmp = icmp eq i32 %x, 0
%ext = zext i1 %cmp to i32
%sub = sub i32 0, %ext
ret i32 %sub
}
; (X != 0) ? 0 : -1 --> (X != 0) - 1
define i16 @i16_select_neg1_or_0_commuted(i16 %x) {
; CHECK-LABEL: i16_select_neg1_or_0_commuted:
; CHECK: # %bb.0:
; CHECK-NEXT: cmpw $1, %di
; CHECK-NEXT: sbbw %ax, %ax
; CHECK-NEXT: retq
%cmp = icmp ne i16 %x, 0
%sel = select i1 %cmp, i16 0, i16 -1
ret i16 %sel
}
; (X != 0) ? 0 : -1 --> (X != 0) - 1
define i8 @i8_select_neg1_or_0_commuted_as_math(i8 %x) {
; CHECK-LABEL: i8_select_neg1_or_0_commuted_as_math:
; CHECK: # %bb.0:
; CHECK-NEXT: cmpb $1, %dil
; CHECK-NEXT: sbbb %al, %al
; CHECK-NEXT: retq
%cmp = icmp ne i8 %x, 0
%ext = zext i1 %cmp to i8
%add = add i8 %ext, -1
ret i8 %add
}
; (X <u Y) ? -1 : 0 --> cmp, sbb
define i32 @ult_select_neg1_or_0(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: ult_select_neg1_or_0:
; CHECK: # %bb.0:
; CHECK-NEXT: cmpl %esi, %edi
; CHECK-NEXT: sbbl %eax, %eax
; CHECK-NEXT: retq
%cmp = icmp ult i32 %x, %y
%ext = sext i1 %cmp to i32
ret i32 %ext
}
; Swap the predicate and compare operands:
; (Y >u X) ? -1 : 0 --> cmp, sbb
define i32 @ugt_select_neg1_or_0(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: ugt_select_neg1_or_0:
; CHECK: # %bb.0:
; CHECK-NEXT: cmpl %esi, %edi
; CHECK-NEXT: sbbl %eax, %eax
; CHECK-NEXT: retq
%cmp = icmp ugt i32 %y, %x
%ext = sext i1 %cmp to i32
ret i32 %ext
}
; Invert the predicate and effectively swap the select operands:
; (X >=u Y) ? 0 : -1 --> (X <u Y) ? -1 : 0 --> cmp, sbb
define i32 @uge_select_0_or_neg1(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: uge_select_0_or_neg1:
; CHECK: # %bb.0:
; CHECK-NEXT: cmpl %esi, %edi
; CHECK-NEXT: sbbl %eax, %eax
; CHECK-NEXT: retq
%cmp = icmp uge i32 %x, %y
%ext = zext i1 %cmp to i32
%add = add i32 %ext, -1
ret i32 %add
}
; Swap the predicate and compare operands:
; (Y <=u X) ? 0 : -1 --> (X <u Y) ? -1 : 0 --> cmp, sbb
define i32 @ule_select_0_or_neg1(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: ule_select_0_or_neg1:
; CHECK: # %bb.0:
; CHECK-NEXT: cmpl %esi, %edi
; CHECK-NEXT: sbbl %eax, %eax
; CHECK-NEXT: retq
%cmp = icmp ule i32 %y, %x
%ext = zext i1 %cmp to i32
%add = add i32 %ext, -1
ret i32 %add
}
; Verify that subtract with constant is the same thing.
; (X >=u Y) ? 0 : -1 --> (X <u Y) ? -1 : 0 --> cmp, sbb
define i32 @uge_select_0_or_neg1_sub(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: uge_select_0_or_neg1_sub:
; CHECK: # %bb.0:
; CHECK-NEXT: cmpl %esi, %edi
; CHECK-NEXT: sbbl %eax, %eax
; CHECK-NEXT: retq
%cmp = icmp uge i32 %x, %y
%ext = zext i1 %cmp to i32
%sub = sub i32 %ext, 1
ret i32 %sub
}
; Check more sub-from-zero patterns.
; (X >u Y) ? -1 : 0 --> cmp, sbb
define i64 @ugt_select_neg1_or_0_sub(i64 %x, i64 %y) nounwind {
; CHECK-LABEL: ugt_select_neg1_or_0_sub:
; CHECK: # %bb.0:
; CHECK-NEXT: cmpq %rdi, %rsi
; CHECK-NEXT: sbbq %rax, %rax
; CHECK-NEXT: retq
%cmp = icmp ugt i64 %x, %y
%zext = zext i1 %cmp to i64
%sub = sub i64 0, %zext
ret i64 %sub
}
; Swap the predicate and compare operands:
; (Y <u X) ? -1 : 0 --> cmp, sbb
define i16 @ult_select_neg1_or_0_sub(i16 %x, i16 %y) nounwind {
; CHECK-LABEL: ult_select_neg1_or_0_sub:
; CHECK: # %bb.0:
; CHECK-NEXT: cmpw %di, %si
; CHECK-NEXT: sbbw %ax, %ax
; CHECK-NEXT: retq
%cmp = icmp ult i16 %y, %x
%zext = zext i1 %cmp to i16
%sub = sub i16 0, %zext
ret i16 %sub
}
; Make sure we're creating nodes with the right value types. This would crash.
; https://bugs.llvm.org/show_bug.cgi?id=33560
define void @PR33560(i8 %x, i64 %y) {
; CHECK-LABEL: PR33560:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: negb %dil
; CHECK-NEXT: sbbq %rax, %rax
; CHECK-NEXT: cmpq %rsi, %rax
; CHECK-NEXT: retq
entry:
%cmp1 = icmp eq i8 %x, 0
%ext = zext i1 %cmp1 to i64
%add = add i64 %ext, -1
%cmp2 = icmp eq i64 %add, %y
br i1 %cmp2, label %end, label %else
else:
%tmp7 = zext i1 %cmp1 to i8
br label %end
end:
ret void
}
|