hoist-and-by-const-from-shl-in-eqcmp-zero.ll
10.7 KB
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
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64-unknown-unknown < %s | FileCheck %s --check-prefixes=CHECK,AARCH64
; We are looking for the following pattern here:
; (X & (C << Y)) ==/!= 0
; It may be optimal to hoist the constant:
; ((X l>> Y) & C) ==/!= 0
;------------------------------------------------------------------------------;
; A few scalar test
;------------------------------------------------------------------------------;
; i8 scalar
define i1 @scalar_i8_signbit_eq(i8 %x, i8 %y) nounwind {
; CHECK-LABEL: scalar_i8_signbit_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: and w8, w0, #0xff
; CHECK-NEXT: // kill: def $w1 killed $w1 def $x1
; CHECK-NEXT: lsr w8, w8, w1
; CHECK-NEXT: tst w8, #0x80
; CHECK-NEXT: cset w0, eq
; CHECK-NEXT: ret
%t0 = shl i8 128, %y
%t1 = and i8 %t0, %x
%res = icmp eq i8 %t1, 0
ret i1 %res
}
define i1 @scalar_i8_lowestbit_eq(i8 %x, i8 %y) nounwind {
; CHECK-LABEL: scalar_i8_lowestbit_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: and w8, w0, #0xff
; CHECK-NEXT: // kill: def $w1 killed $w1 def $x1
; CHECK-NEXT: lsr w8, w8, w1
; CHECK-NEXT: tst w8, #0x1
; CHECK-NEXT: cset w0, eq
; CHECK-NEXT: ret
%t0 = shl i8 1, %y
%t1 = and i8 %t0, %x
%res = icmp eq i8 %t1, 0
ret i1 %res
}
define i1 @scalar_i8_bitsinmiddle_eq(i8 %x, i8 %y) nounwind {
; CHECK-LABEL: scalar_i8_bitsinmiddle_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: and w8, w0, #0xff
; CHECK-NEXT: // kill: def $w1 killed $w1 def $x1
; CHECK-NEXT: lsr w8, w8, w1
; CHECK-NEXT: tst w8, #0x18
; CHECK-NEXT: cset w0, eq
; CHECK-NEXT: ret
%t0 = shl i8 24, %y
%t1 = and i8 %t0, %x
%res = icmp eq i8 %t1, 0
ret i1 %res
}
; i16 scalar
define i1 @scalar_i16_signbit_eq(i16 %x, i16 %y) nounwind {
; CHECK-LABEL: scalar_i16_signbit_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: and w8, w0, #0xffff
; CHECK-NEXT: // kill: def $w1 killed $w1 def $x1
; CHECK-NEXT: lsr w8, w8, w1
; CHECK-NEXT: tst w8, #0x8000
; CHECK-NEXT: cset w0, eq
; CHECK-NEXT: ret
%t0 = shl i16 32768, %y
%t1 = and i16 %t0, %x
%res = icmp eq i16 %t1, 0
ret i1 %res
}
define i1 @scalar_i16_lowestbit_eq(i16 %x, i16 %y) nounwind {
; CHECK-LABEL: scalar_i16_lowestbit_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: and w8, w0, #0xffff
; CHECK-NEXT: // kill: def $w1 killed $w1 def $x1
; CHECK-NEXT: lsr w8, w8, w1
; CHECK-NEXT: tst w8, #0x1
; CHECK-NEXT: cset w0, eq
; CHECK-NEXT: ret
%t0 = shl i16 1, %y
%t1 = and i16 %t0, %x
%res = icmp eq i16 %t1, 0
ret i1 %res
}
define i1 @scalar_i16_bitsinmiddle_eq(i16 %x, i16 %y) nounwind {
; CHECK-LABEL: scalar_i16_bitsinmiddle_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: and w8, w0, #0xffff
; CHECK-NEXT: // kill: def $w1 killed $w1 def $x1
; CHECK-NEXT: lsr w8, w8, w1
; CHECK-NEXT: tst w8, #0xff0
; CHECK-NEXT: cset w0, eq
; CHECK-NEXT: ret
%t0 = shl i16 4080, %y
%t1 = and i16 %t0, %x
%res = icmp eq i16 %t1, 0
ret i1 %res
}
; i32 scalar
define i1 @scalar_i32_signbit_eq(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: scalar_i32_signbit_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: lsr w8, w0, w1
; CHECK-NEXT: tst w8, #0x80000000
; CHECK-NEXT: cset w0, eq
; CHECK-NEXT: ret
%t0 = shl i32 2147483648, %y
%t1 = and i32 %t0, %x
%res = icmp eq i32 %t1, 0
ret i1 %res
}
define i1 @scalar_i32_lowestbit_eq(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: scalar_i32_lowestbit_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: lsr w8, w0, w1
; CHECK-NEXT: tst w8, #0x1
; CHECK-NEXT: cset w0, eq
; CHECK-NEXT: ret
%t0 = shl i32 1, %y
%t1 = and i32 %t0, %x
%res = icmp eq i32 %t1, 0
ret i1 %res
}
define i1 @scalar_i32_bitsinmiddle_eq(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: scalar_i32_bitsinmiddle_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: lsr w8, w0, w1
; CHECK-NEXT: tst w8, #0xffff00
; CHECK-NEXT: cset w0, eq
; CHECK-NEXT: ret
%t0 = shl i32 16776960, %y
%t1 = and i32 %t0, %x
%res = icmp eq i32 %t1, 0
ret i1 %res
}
; i64 scalar
define i1 @scalar_i64_signbit_eq(i64 %x, i64 %y) nounwind {
; CHECK-LABEL: scalar_i64_signbit_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: lsr x8, x0, x1
; CHECK-NEXT: tst x8, #0x8000000000000000
; CHECK-NEXT: cset w0, eq
; CHECK-NEXT: ret
%t0 = shl i64 9223372036854775808, %y
%t1 = and i64 %t0, %x
%res = icmp eq i64 %t1, 0
ret i1 %res
}
define i1 @scalar_i64_lowestbit_eq(i64 %x, i64 %y) nounwind {
; CHECK-LABEL: scalar_i64_lowestbit_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: lsr x8, x0, x1
; CHECK-NEXT: tst x8, #0x1
; CHECK-NEXT: cset w0, eq
; CHECK-NEXT: ret
%t0 = shl i64 1, %y
%t1 = and i64 %t0, %x
%res = icmp eq i64 %t1, 0
ret i1 %res
}
define i1 @scalar_i64_bitsinmiddle_eq(i64 %x, i64 %y) nounwind {
; CHECK-LABEL: scalar_i64_bitsinmiddle_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: lsr x8, x0, x1
; CHECK-NEXT: tst x8, #0xffffffff0000
; CHECK-NEXT: cset w0, eq
; CHECK-NEXT: ret
%t0 = shl i64 281474976645120, %y
%t1 = and i64 %t0, %x
%res = icmp eq i64 %t1, 0
ret i1 %res
}
;------------------------------------------------------------------------------;
; A few trivial vector tests
;------------------------------------------------------------------------------;
define <4 x i1> @vec_4xi32_splat_eq(<4 x i32> %x, <4 x i32> %y) nounwind {
; CHECK-LABEL: vec_4xi32_splat_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: movi v2.4s, #1
; CHECK-NEXT: ushl v1.4s, v2.4s, v1.4s
; CHECK-NEXT: and v0.16b, v1.16b, v0.16b
; CHECK-NEXT: cmeq v0.4s, v0.4s, #0
; CHECK-NEXT: xtn v0.4h, v0.4s
; CHECK-NEXT: ret
%t0 = shl <4 x i32> <i32 1, i32 1, i32 1, i32 1>, %y
%t1 = and <4 x i32> %t0, %x
%res = icmp eq <4 x i32> %t1, <i32 0, i32 0, i32 0, i32 0>
ret <4 x i1> %res
}
define <4 x i1> @vec_4xi32_nonsplat_eq(<4 x i32> %x, <4 x i32> %y) nounwind {
; CHECK-LABEL: vec_4xi32_nonsplat_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: adrp x8, .LCPI13_0
; CHECK-NEXT: ldr q2, [x8, :lo12:.LCPI13_0]
; CHECK-NEXT: ushl v1.4s, v2.4s, v1.4s
; CHECK-NEXT: and v0.16b, v1.16b, v0.16b
; CHECK-NEXT: cmeq v0.4s, v0.4s, #0
; CHECK-NEXT: xtn v0.4h, v0.4s
; CHECK-NEXT: ret
%t0 = shl <4 x i32> <i32 0, i32 1, i32 16776960, i32 2147483648>, %y
%t1 = and <4 x i32> %t0, %x
%res = icmp eq <4 x i32> %t1, <i32 0, i32 0, i32 0, i32 0>
ret <4 x i1> %res
}
define <4 x i1> @vec_4xi32_nonsplat_undef0_eq(<4 x i32> %x, <4 x i32> %y) nounwind {
; CHECK-LABEL: vec_4xi32_nonsplat_undef0_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: movi v2.4s, #1
; CHECK-NEXT: ushl v1.4s, v2.4s, v1.4s
; CHECK-NEXT: and v0.16b, v1.16b, v0.16b
; CHECK-NEXT: cmeq v0.4s, v0.4s, #0
; CHECK-NEXT: xtn v0.4h, v0.4s
; CHECK-NEXT: ret
%t0 = shl <4 x i32> <i32 1, i32 1, i32 undef, i32 1>, %y
%t1 = and <4 x i32> %t0, %x
%res = icmp eq <4 x i32> %t1, <i32 0, i32 0, i32 0, i32 0>
ret <4 x i1> %res
}
define <4 x i1> @vec_4xi32_nonsplat_undef1_eq(<4 x i32> %x, <4 x i32> %y) nounwind {
; CHECK-LABEL: vec_4xi32_nonsplat_undef1_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: movi v2.4s, #1
; CHECK-NEXT: ushl v1.4s, v2.4s, v1.4s
; CHECK-NEXT: and v0.16b, v1.16b, v0.16b
; CHECK-NEXT: cmeq v0.4s, v0.4s, #0
; CHECK-NEXT: xtn v0.4h, v0.4s
; CHECK-NEXT: ret
%t0 = shl <4 x i32> <i32 1, i32 1, i32 1, i32 1>, %y
%t1 = and <4 x i32> %t0, %x
%res = icmp eq <4 x i32> %t1, <i32 0, i32 0, i32 undef, i32 0>
ret <4 x i1> %res
}
define <4 x i1> @vec_4xi32_nonsplat_undef2_eq(<4 x i32> %x, <4 x i32> %y) nounwind {
; CHECK-LABEL: vec_4xi32_nonsplat_undef2_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: movi v2.4s, #1
; CHECK-NEXT: ushl v1.4s, v2.4s, v1.4s
; CHECK-NEXT: and v0.16b, v1.16b, v0.16b
; CHECK-NEXT: cmeq v0.4s, v0.4s, #0
; CHECK-NEXT: xtn v0.4h, v0.4s
; CHECK-NEXT: ret
%t0 = shl <4 x i32> <i32 1, i32 1, i32 undef, i32 1>, %y
%t1 = and <4 x i32> %t0, %x
%res = icmp eq <4 x i32> %t1, <i32 0, i32 0, i32 undef, i32 0>
ret <4 x i1> %res
}
;------------------------------------------------------------------------------;
; A special tests
;------------------------------------------------------------------------------;
define i1 @scalar_i8_signbit_ne(i8 %x, i8 %y) nounwind {
; CHECK-LABEL: scalar_i8_signbit_ne:
; CHECK: // %bb.0:
; CHECK-NEXT: and w8, w0, #0xff
; CHECK-NEXT: // kill: def $w1 killed $w1 def $x1
; CHECK-NEXT: lsr w8, w8, w1
; CHECK-NEXT: lsr w0, w8, #7
; CHECK-NEXT: ret
%t0 = shl i8 128, %y
%t1 = and i8 %t0, %x
%res = icmp ne i8 %t1, 0 ; we are perfectly happy with 'ne' predicate
ret i1 %res
}
;------------------------------------------------------------------------------;
; What if X is a constant too?
;------------------------------------------------------------------------------;
define i1 @scalar_i32_x_is_const_eq(i32 %y) nounwind {
; CHECK-LABEL: scalar_i32_x_is_const_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: mov w8, #43605
; CHECK-NEXT: movk w8, #43605, lsl #16
; CHECK-NEXT: lsl w8, w8, w0
; CHECK-NEXT: tst w8, #0x1
; CHECK-NEXT: cset w0, eq
; CHECK-NEXT: ret
%t0 = shl i32 2857740885, %y
%t1 = and i32 %t0, 1
%res = icmp eq i32 %t1, 0
ret i1 %res
}
define i1 @scalar_i32_x_is_const2_eq(i32 %y) nounwind {
; CHECK-LABEL: scalar_i32_x_is_const2_eq:
; CHECK: // %bb.0:
; CHECK-NEXT: mov w8, #1
; CHECK-NEXT: mov w9, #43605
; CHECK-NEXT: lsl w8, w8, w0
; CHECK-NEXT: movk w9, #43605, lsl #16
; CHECK-NEXT: tst w8, w9
; CHECK-NEXT: cset w0, eq
; CHECK-NEXT: ret
%t0 = shl i32 1, %y
%t1 = and i32 %t0, 2857740885
%res = icmp eq i32 %t1, 0
ret i1 %res
}
;------------------------------------------------------------------------------;
; A few negative tests
;------------------------------------------------------------------------------;
define i1 @negative_scalar_i8_bitsinmiddle_slt(i8 %x, i8 %y) nounwind {
; CHECK-LABEL: negative_scalar_i8_bitsinmiddle_slt:
; CHECK: // %bb.0:
; CHECK-NEXT: mov w8, #24
; CHECK-NEXT: // kill: def $w1 killed $w1 def $x1
; CHECK-NEXT: lsl w8, w8, w1
; CHECK-NEXT: and w8, w8, w0
; CHECK-NEXT: sxtb w8, w8
; CHECK-NEXT: cmp w8, #0 // =0
; CHECK-NEXT: cset w0, lt
; CHECK-NEXT: ret
%t0 = shl i8 24, %y
%t1 = and i8 %t0, %x
%res = icmp slt i8 %t1, 0
ret i1 %res
}
define i1 @scalar_i8_signbit_eq_with_nonzero(i8 %x, i8 %y) nounwind {
; CHECK-LABEL: scalar_i8_signbit_eq_with_nonzero:
; CHECK: // %bb.0:
; CHECK-NEXT: mov w8, #-128
; CHECK-NEXT: // kill: def $w1 killed $w1 def $x1
; CHECK-NEXT: lsl w8, w8, w1
; CHECK-NEXT: and w8, w8, w0
; CHECK-NEXT: and w8, w8, #0x80
; CHECK-NEXT: cmp w8, #1 // =1
; CHECK-NEXT: cset w0, eq
; CHECK-NEXT: ret
%t0 = shl i8 128, %y
%t1 = and i8 %t0, %x
%res = icmp eq i8 %t1, 1 ; should be comparing with 0
ret i1 %res
}