/
bitfield.go
368 lines (299 loc) · 9.64 KB
/
bitfield.go
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
356
357
358
359
360
361
362
363
364
365
366
367
368
// asmcheck
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package codegen
// This file contains codegen tests related to bit field
// insertion/extraction simplifications/optimizations.
func extr1(x, x2 uint64) uint64 {
return x<<7 + x2>>57 // arm64:"EXTR\t[$]57,"
}
func extr2(x, x2 uint64) uint64 {
return x<<7 | x2>>57 // arm64:"EXTR\t[$]57,"
}
func extr3(x, x2 uint64) uint64 {
return x<<7 ^ x2>>57 // arm64:"EXTR\t[$]57,"
}
func extr4(x, x2 uint32) uint32 {
return x<<7 + x2>>25 // arm64:"EXTRW\t[$]25,"
}
func extr5(x, x2 uint32) uint32 {
return x<<7 | x2>>25 // arm64:"EXTRW\t[$]25,"
}
func extr6(x, x2 uint32) uint32 {
return x<<7 ^ x2>>25 // arm64:"EXTRW\t[$]25,"
}
// check 32-bit shift masking
func mask32(x uint32) uint32 {
return (x << 29) >> 29 // arm64:"AND\t[$]7, R[0-9]+",-"LSR",-"LSL"
}
// check 16-bit shift masking
func mask16(x uint16) uint16 {
return (x << 14) >> 14 // arm64:"AND\t[$]3, R[0-9]+",-"LSR",-"LSL"
}
// check 8-bit shift masking
func mask8(x uint8) uint8 {
return (x << 7) >> 7 // arm64:"AND\t[$]1, R[0-9]+",-"LSR",-"LSL"
}
func maskshift(x uint64) uint64 {
// arm64:"AND\t[$]4095, R[0-9]+",-"LSL",-"LSR",-"UBFIZ",-"UBFX"
return ((x << 5) & (0xfff << 5)) >> 5
}
// bitfield ops
// bfi
func bfi1(x, y uint64) uint64 {
// arm64:"BFI\t[$]4, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
return ((x & 0xfff) << 4) | (y & 0xffffffffffff000f)
}
func bfi2(x, y uint64) uint64 {
// arm64:"BFI\t[$]12, R[0-9]+, [$]40",-"LSL",-"LSR",-"AND"
return (x << 24 >> 12) | (y & 0xfff0000000000fff)
}
// bfxil
func bfxil1(x, y uint64) uint64 {
// arm64:"BFXIL\t[$]5, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
return ((x >> 5) & 0xfff) | (y & 0xfffffffffffff000)
}
func bfxil2(x, y uint64) uint64 {
// arm64:"BFXIL\t[$]12, R[0-9]+, [$]40",-"LSL",-"LSR",-"AND"
return (x << 12 >> 24) | (y & 0xffffff0000000000)
}
// sbfiz
// merge shifts into sbfiz: (x << lc) >> rc && lc > rc.
func sbfiz1(x int64) int64 {
// arm64:"SBFIZ\t[$]1, R[0-9]+, [$]60",-"LSL",-"ASR"
return (x << 4) >> 3
}
// merge shift and sign-extension into sbfiz.
func sbfiz2(x int32) int64 {
return int64(x << 3) // arm64:"SBFIZ\t[$]3, R[0-9]+, [$]29",-"LSL"
}
func sbfiz3(x int16) int64 {
return int64(x << 3) // arm64:"SBFIZ\t[$]3, R[0-9]+, [$]13",-"LSL"
}
func sbfiz4(x int8) int64 {
return int64(x << 3) // arm64:"SBFIZ\t[$]3, R[0-9]+, [$]5",-"LSL"
}
// sbfiz combinations.
// merge shift with sbfiz into sbfiz.
func sbfiz5(x int32) int32 {
// arm64:"SBFIZ\t[$]1, R[0-9]+, [$]28",-"LSL",-"ASR"
return (x << 4) >> 3
}
func sbfiz6(x int16) int64 {
return int64(x+1) << 3 // arm64:"SBFIZ\t[$]3, R[0-9]+, [$]16",-"LSL"
}
func sbfiz7(x int8) int64 {
return int64(x+1) << 62 // arm64:"SBFIZ\t[$]62, R[0-9]+, [$]2",-"LSL"
}
func sbfiz8(x int32) int64 {
return int64(x+1) << 40 // arm64:"SBFIZ\t[$]40, R[0-9]+, [$]24",-"LSL"
}
// sbfx
// merge shifts into sbfx: (x << lc) >> rc && lc <= rc.
func sbfx1(x int64) int64 {
return (x << 3) >> 4 // arm64:"SBFX\t[$]1, R[0-9]+, [$]60",-"LSL",-"ASR"
}
func sbfx2(x int64) int64 {
return (x << 60) >> 60 // arm64:"SBFX\t[$]0, R[0-9]+, [$]4",-"LSL",-"ASR"
}
// merge shift and sign-extension into sbfx.
func sbfx3(x int32) int64 {
return int64(x) >> 3 // arm64:"SBFX\t[$]3, R[0-9]+, [$]29",-"ASR"
}
func sbfx4(x int16) int64 {
return int64(x) >> 3 // arm64:"SBFX\t[$]3, R[0-9]+, [$]13",-"ASR"
}
func sbfx5(x int8) int64 {
return int64(x) >> 3 // arm64:"SBFX\t[$]3, R[0-9]+, [$]5",-"ASR"
}
func sbfx6(x int32) int64 {
return int64(x >> 30) // arm64:"SBFX\t[$]30, R[0-9]+, [$]2"
}
func sbfx7(x int16) int64 {
return int64(x >> 10) // arm64:"SBFX\t[$]10, R[0-9]+, [$]6"
}
func sbfx8(x int8) int64 {
return int64(x >> 5) // arm64:"SBFX\t[$]5, R[0-9]+, [$]3"
}
// sbfx combinations.
// merge shifts with sbfiz into sbfx.
func sbfx9(x int32) int32 {
return (x << 3) >> 4 // arm64:"SBFX\t[$]1, R[0-9]+, [$]28",-"LSL",-"ASR"
}
// merge sbfx and sign-extension into sbfx.
func sbfx10(x int32) int64 {
c := x + 5
return int64(c >> 20) // arm64"SBFX\t[$]20, R[0-9]+, [$]12",-"MOVW\tR[0-9]+, R[0-9]+"
}
// ubfiz
// merge shifts into ubfiz: (x<<lc)>>rc && lc>rc
func ubfiz1(x uint64) uint64 {
// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]60",-"LSL",-"LSR"
// s390x:"RISBGZ\t[$]3, [$]62, [$]1, ",-"SLD",-"SRD"
return (x << 4) >> 3
}
// merge shift and zero-extension into ubfiz.
func ubfiz2(x uint32) uint64 {
return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]32",-"LSL"
}
func ubfiz3(x uint16) uint64 {
return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]16",-"LSL"
}
func ubfiz4(x uint8) uint64 {
return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]8",-"LSL"
}
func ubfiz5(x uint8) uint64 {
return uint64(x) << 60 // arm64:"UBFIZ\t[$]60, R[0-9]+, [$]4",-"LSL"
}
func ubfiz6(x uint32) uint64 {
return uint64(x << 30) // arm64:"UBFIZ\t[$]30, R[0-9]+, [$]2",
}
func ubfiz7(x uint16) uint64 {
return uint64(x << 10) // arm64:"UBFIZ\t[$]10, R[0-9]+, [$]6",
}
func ubfiz8(x uint8) uint64 {
return uint64(x << 7) // arm64:"UBFIZ\t[$]7, R[0-9]+, [$]1",
}
// merge ANDconst into ubfiz.
func ubfiz9(x uint64) uint64 {
// arm64:"UBFIZ\t[$]3, R[0-9]+, [$]12",-"LSL",-"AND"
// s390x:"RISBGZ\t[$]49, [$]60, [$]3,",-"SLD",-"AND"
return (x & 0xfff) << 3
}
func ubfiz10(x uint64) uint64 {
// arm64:"UBFIZ\t[$]4, R[0-9]+, [$]12",-"LSL",-"AND"
// s390x:"RISBGZ\t[$]48, [$]59, [$]4,",-"SLD",-"AND"
return (x << 4) & 0xfff0
}
// ubfiz combinations
func ubfiz11(x uint32) uint32 {
// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]28",-"LSL",-"LSR"
return (x << 4) >> 3
}
func ubfiz12(x uint64) uint64 {
// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]20",-"LSL",-"LSR"
// s390x:"RISBGZ\t[$]43, [$]62, [$]1, ",-"SLD",-"SRD",-"AND"
return ((x & 0xfffff) << 4) >> 3
}
func ubfiz13(x uint64) uint64 {
// arm64:"UBFIZ\t[$]5, R[0-9]+, [$]13",-"LSL",-"LSR",-"AND"
return ((x << 3) & 0xffff) << 2
}
func ubfiz14(x uint64) uint64 {
// arm64:"UBFIZ\t[$]7, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
// s390x:"RISBGZ\t[$]45, [$]56, [$]7, ",-"SLD",-"SRD",-"AND"
return ((x << 5) & (0xfff << 5)) << 2
}
// ubfx
// merge shifts into ubfx: (x<<lc)>>rc && lc<rc
func ubfx1(x uint64) uint64 {
// arm64:"UBFX\t[$]1, R[0-9]+, [$]62",-"LSL",-"LSR"
// s390x:"RISBGZ\t[$]2, [$]63, [$]63,",-"SLD",-"SRD"
return (x << 1) >> 2
}
// merge shift and zero-extension into ubfx.
func ubfx2(x uint32) uint64 {
return uint64(x >> 15) // arm64:"UBFX\t[$]15, R[0-9]+, [$]17",-"LSR"
}
func ubfx3(x uint16) uint64 {
return uint64(x >> 9) // arm64:"UBFX\t[$]9, R[0-9]+, [$]7",-"LSR"
}
func ubfx4(x uint8) uint64 {
return uint64(x >> 3) // arm64:"UBFX\t[$]3, R[0-9]+, [$]5",-"LSR"
}
func ubfx5(x uint32) uint64 {
return uint64(x) >> 30 // arm64:"UBFX\t[$]30, R[0-9]+, [$]2"
}
func ubfx6(x uint16) uint64 {
return uint64(x) >> 10 // arm64:"UBFX\t[$]10, R[0-9]+, [$]6"
}
func ubfx7(x uint8) uint64 {
return uint64(x) >> 3 // arm64:"UBFX\t[$]3, R[0-9]+, [$]5"
}
// merge ANDconst into ubfx.
func ubfx8(x uint64) uint64 {
// arm64:"UBFX\t[$]25, R[0-9]+, [$]10",-"LSR",-"AND"
// s390x:"RISBGZ\t[$]54, [$]63, [$]39, ",-"SRD",-"AND"
return (x >> 25) & 1023
}
func ubfx9(x uint64) uint64 {
// arm64:"UBFX\t[$]4, R[0-9]+, [$]8",-"LSR",-"AND"
// s390x:"RISBGZ\t[$]56, [$]63, [$]60, ",-"SRD",-"AND"
return (x & 0x0ff0) >> 4
}
// ubfx combinations.
func ubfx10(x uint32) uint32 {
// arm64:"UBFX\t[$]1, R[0-9]+, [$]30",-"LSL",-"LSR"
return (x << 1) >> 2
}
func ubfx11(x uint64) uint64 {
// arm64:"UBFX\t[$]1, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
// s390x:"RISBGZ\t[$]52, [$]63, [$]63,",-"SLD",-"SRD",-"AND"
return ((x << 1) >> 2) & 0xfff
}
func ubfx12(x uint64) uint64 {
// arm64:"UBFX\t[$]4, R[0-9]+, [$]11",-"LSL",-"LSR",-"AND"
// s390x:"RISBGZ\t[$]53, [$]63, [$]60, ",-"SLD",-"SRD",-"AND"
return ((x >> 3) & 0xfff) >> 1
}
func ubfx13(x uint64) uint64 {
// arm64:"UBFX\t[$]5, R[0-9]+, [$]56",-"LSL",-"LSR"
// s390x:"RISBGZ\t[$]8, [$]63, [$]59, ",-"SLD",-"SRD"
return ((x >> 2) << 5) >> 8
}
func ubfx14(x uint64) uint64 {
// arm64:"UBFX\t[$]1, R[0-9]+, [$]19",-"LSL",-"LSR"
// s390x:"RISBGZ\t[$]45, [$]63, [$]63, ",-"SLD",-"SRD",-"AND"
return ((x & 0xfffff) << 3) >> 4
}
// merge ubfx and zero-extension into ubfx.
func ubfx15(x uint64) bool {
midr := x + 10
part_num := uint16((midr >> 4) & 0xfff)
if part_num == 0xd0c { // arm64:"UBFX\t[$]4, R[0-9]+, [$]12",-"MOVHU\tR[0-9]+, R[0-9]+"
return true
}
return false
}
// merge ANDconst and ubfx into ubfx
func ubfx16(x uint64) uint64 {
// arm64:"UBFX\t[$]4, R[0-9]+, [$]6",-"AND\t[$]63"
return ((x >> 3) & 0xfff) >> 1 & 0x3f
}
// Check that we don't emit comparisons for constant shifts.
//
//go:nosplit
func shift_no_cmp(x int) int {
// arm64:`LSL\t[$]17`,-`CMP`
// mips64:`SLLV\t[$]17`,-`SGT`
return x << 17
}
func rev16(c uint64) (uint64, uint64, uint64) {
// arm64:`REV16`,-`AND`,-`LSR`,-`AND`,-`ORR\tR[0-9]+<<8`
b1 := ((c & 0xff00ff00ff00ff00) >> 8) | ((c & 0x00ff00ff00ff00ff) << 8)
// arm64:-`ADD\tR[0-9]+<<8`
b2 := ((c & 0xff00ff00ff00ff00) >> 8) + ((c & 0x00ff00ff00ff00ff) << 8)
// arm64:-`EOR\tR[0-9]+<<8`
b3 := ((c & 0xff00ff00ff00ff00) >> 8) ^ ((c & 0x00ff00ff00ff00ff) << 8)
return b1, b2, b3
}
func rev16w(c uint32) (uint32, uint32, uint32) {
// arm64:`REV16W`,-`AND`,-`UBFX`,-`AND`,-`ORR\tR[0-9]+<<8`
b1 := ((c & 0xff00ff00) >> 8) | ((c & 0x00ff00ff) << 8)
// arm64:-`ADD\tR[0-9]+<<8`
b2 := ((c & 0xff00ff00) >> 8) + ((c & 0x00ff00ff) << 8)
// arm64:-`EOR\tR[0-9]+<<8`
b3 := ((c & 0xff00ff00) >> 8) ^ ((c & 0x00ff00ff) << 8)
return b1, b2, b3
}
func shift(x uint32, y uint16, z uint8) uint64 {
// arm64:-`MOVWU`,-`LSR\t[$]32`
a := uint64(x) >> 32
// arm64:-`MOVHU
b := uint64(y) >> 16
// arm64:-`MOVBU`
c := uint64(z) >> 8
// arm64:`MOVD\tZR`,-`ADD\tR[0-9]+>>16`,-`ADD\tR[0-9]+>>8`,
return a + b + c
}