mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
406 lines
20 KiB
ArmAsm
406 lines
20 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
|
||
│vi: set et ft=asm ts=8 sw=8 fenc=utf-8 :vi│
|
||
╞══════════════════════════════════════════════════════════════════════════════╡
|
||
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
||
│ │
|
||
│ Permission to use, copy, modify, and/or distribute this software for │
|
||
│ any purpose with or without fee is hereby granted, provided that the │
|
||
│ above copyright notice and this permission notice appear in all copies. │
|
||
│ │
|
||
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
||
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
||
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
||
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
||
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
||
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
||
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
||
│ PERFORMANCE OF THIS SOFTWARE. │
|
||
╚──────────────────────────────────────────────────────────────────────────────╝
|
||
@fileoverview Cosmopolitan Memory Setter
|
||
|
||
This sets one bit per picosecond on a $900 Skylake workstation,
|
||
which is about 110 GBps. */
|
||
#include "libc/nexgen32e/x86feature.h"
|
||
#include "libc/nexgen32e/macros.h"
|
||
#include "libc/macros.internal.h"
|
||
|
||
// Sets memory.
|
||
//
|
||
// @param rdi is dest
|
||
// @param esi is the byte to set
|
||
// @param edx is the number of bytes to set
|
||
// @return original rdi copied to rax
|
||
// @mode long
|
||
// @asyncsignalsafe
|
||
memset: mov %rdi,%rax
|
||
// 𝑠𝑙𝑖𝑑𝑒
|
||
.align 16
|
||
.endfn memset,globl
|
||
|
||
// Sets memory w/ minimal-impact ABI.
|
||
//
|
||
// @param rdi is dest
|
||
// @param esi is the byte to set
|
||
// @param edx is the number of bytes to set
|
||
// @clob flags,rcx,xmm3
|
||
// @mode long
|
||
MemSet: .leafprologue
|
||
.profilable
|
||
mov $.Lmemsettab.ro.size,%ecx
|
||
cmp %rcx,%rdx
|
||
cmovb %rdx,%rcx
|
||
jmp *memsettab(,%rcx,8)
|
||
.Lanchorpoint:
|
||
.L32r: cmp $1024,%rdx
|
||
jae .Lerms
|
||
.L32: vmovd %esi,%xmm3
|
||
vpbroadcastb %xmm3,%ymm3
|
||
mov $32,%ecx
|
||
1: lea 32(%rcx),%rcx
|
||
vmovdqu %ymm3,-64(%rdi,%rcx)
|
||
cmp %rcx,%rdx
|
||
ja 1b
|
||
vmovdqu %ymm3,-32(%rdi,%rdx)
|
||
vpxor %ymm3,%ymm3,%ymm3
|
||
jmp .L0
|
||
.L16r: cmp $1024,%rdx
|
||
jae .Lerms
|
||
.L16: movd %esi,%xmm3
|
||
pbroadcastb %xmm3
|
||
mov $16,%ecx
|
||
1: lea 16(%rcx),%rcx
|
||
movdqu %xmm3,-32(%rdi,%rcx)
|
||
cmp %rcx,%rdx
|
||
ja 1b
|
||
movdqu %xmm3,-16(%rdi,%rdx)
|
||
pxor %xmm3,%xmm3
|
||
.L0: .leafepilogue
|
||
.L8: movzbl %sil,%ecx
|
||
imul .Lb8(%rip),%rcx
|
||
mov %rcx,(%rdi)
|
||
mov %rcx,-8(%rdi,%rdx)
|
||
jmp .L0
|
||
.L4: movzbl %sil,%ecx
|
||
imul $0x01010101,%ecx,%ecx
|
||
mov %ecx,(%rdi)
|
||
mov %ecx,-4(%rdi,%rdx)
|
||
jmp .L0
|
||
.L3: mov %sil,2(%rdi)
|
||
.L2: mov %sil,1(%rdi)
|
||
.L1: mov %sil,(%rdi)
|
||
jmp .L0
|
||
.Lerms: push %rax
|
||
push %rdi
|
||
mov %esi,%eax
|
||
mov %rdx,%rcx
|
||
rep stosb
|
||
pop %rdi
|
||
pop %rax
|
||
jmp .L0
|
||
.endfn MemSet,globl,hidden
|
||
.source __FILE__
|
||
|
||
.rodata.cst8
|
||
.Lb8: .quad 0x0101010101010101
|
||
.previous
|
||
|
||
.initro 300,_init_memset
|
||
memsettab.ro:
|
||
.byte .L0 - .Lanchorpoint
|
||
.byte .L1 - .Lanchorpoint
|
||
.byte .L2 - .Lanchorpoint
|
||
.byte .L3 - .Lanchorpoint
|
||
.rept 4
|
||
.byte .L4 - .Lanchorpoint
|
||
.endr
|
||
.rept 8
|
||
.byte .L8 - .Lanchorpoint
|
||
.endr
|
||
.rept 16
|
||
.byte .L16 - .Lanchorpoint
|
||
.endr
|
||
.equ .Lmemsettab.ro.size,.-memsettab.ro
|
||
.endobj memsettab.ro
|
||
.if .Lmemsettab.ro.size % 8
|
||
.error "moar jmptab"
|
||
.endif
|
||
.byte .L16 - .Lanchorpoint # SSE2
|
||
.byte .L16r - .Lanchorpoint # SSE2 + ERMS
|
||
.byte .L32 - .Lanchorpoint # AVX2
|
||
.byte .L32r - .Lanchorpoint # AVX2 + ERMS
|
||
.byte 0,0,0,0
|
||
.previous
|
||
|
||
.initbss 300,_init_memset
|
||
memsettab:
|
||
.rept .Lmemsettab.ro.size
|
||
.quad 0
|
||
.endr
|
||
.quad 0
|
||
.endobj memsettab
|
||
.previous
|
||
|
||
.init.start 300,_init_memset
|
||
pushpop .Lmemsettab.ro.size,%rcx
|
||
ezlea .Lanchorpoint,dx
|
||
testb X86_HAVE(AVX2)+kCpuids(%rip)
|
||
call memjmpinit
|
||
.init.end 300,_init_memset
|
||
|
||
/* benchmarks on intel core i7-6700 @ 3.40GHz (skylake)
|
||
includes function call overhead (unless marked otherwise)
|
||
|
||
Your memset() for #c per n where c ≈ 0.273ns
|
||
N x1 x8 x64 mBps
|
||
------------------------------------------------------------
|
||
1 73.000 35.125 36.141 97
|
||
1 35.000 36.375 35.984 97
|
||
2 28.500 19.938 18.820 185
|
||
3 19.000 12.458 12.651 276
|
||
4 15.750 10.719 9.566 365
|
||
7 5.000 5.411 5.730 609
|
||
8 8.375 4.953 4.697 743
|
||
15 4.200 2.408 2.407 1450
|
||
16 7.188 2.539 2.382 1465 «
|
||
31 1.129 1.206 1.183 2950
|
||
32 15.156 2.012 1.292 2702
|
||
63 4.016 0.986 0.663 5264
|
||
64 3.547 0.967 0.684 5104
|
||
127 2.087 0.562 0.338 10311
|
||
128 1.805 0.499 0.336 10393
|
||
255 0.412 0.180 0.183 19119
|
||
256 0.160 0.170 0.169 20650
|
||
511 0.162 0.134 0.108 32214
|
||
512 0.100 0.106 0.104 33507
|
||
1023 0.110 0.095 0.082 42574
|
||
1024 0.099 0.080 0.078 44944
|
||
2047 0.155 0.154 0.154 22624
|
||
2048 0.052 0.052 0.053 66266
|
||
4095 0.098 0.099 0.099 35142
|
||
4096 0.042 0.042 0.041 84250
|
||
8191 0.072 0.073 0.072 48157
|
||
8192 0.034 0.034 0.034 101332
|
||
16383 0.059 0.059 0.059 58997
|
||
16384 0.031 0.031 0.031 112972
|
||
32767 0.054 0.054 0.054 65053
|
||
32768 0.029 0.029 0.029 119433
|
||
65535 0.069 0.069 0.068 51690
|
||
65536 0.057 0.057 0.057 61434
|
||
131071 0.066 0.066 0.066 53001
|
||
131072 0.057 0.058 0.057 60716
|
||
262143 0.066 0.065 0.065 53462
|
||
262144 0.060 0.058 0.058 60104
|
||
524287 0.067 0.068 0.072 48784
|
||
524288 0.063 0.062 0.061 56957
|
||
1048575 0.068 0.068 0.069 50353
|
||
1048576 0.062 0.060 0.062 56661
|
||
2097151 0.066 0.066 0.067 52421
|
||
2097152 0.060 0.060 0.061 57672
|
||
4194303 0.072 0.067 0.067 51910
|
||
4194304 0.062 0.061 0.062 56327
|
||
8388607 0.129 0.111 0.111 31368
|
||
8388608 0.136 0.119 0.111 31519
|
||
|
||
glibc memset() for #c per n where c ≈ 0.273ns
|
||
N x1 x8 x64 mBps
|
||
------------------------------------------------------------
|
||
1 121.000 39.125 35.547 98
|
||
1 33.000 35.875 35.172 99
|
||
2 17.500 18.312 18.070 193
|
||
3 16.333 14.542 12.411 281
|
||
4 12.250 9.344 9.215 379
|
||
7 7.571 5.732 5.453 640
|
||
8 4.625 4.641 4.623 755
|
||
15 4.467 3.158 2.478 1408
|
||
16 2.312 2.289 2.468 1414
|
||
31 2.290 1.367 1.278 2731
|
||
32 1.219 1.176 1.182 2952
|
||
63 0.905 0.696 0.656 5320
|
||
64 0.672 0.658 0.660 5285
|
||
127 1.299 0.723 0.673 5183
|
||
128 0.508 0.423 0.424 8227
|
||
255 0.490 0.428 0.417 8367
|
||
256 0.293 0.233 0.243 14349
|
||
511 0.284 0.232 0.234 14902
|
||
512 0.154 0.131 0.131 26626
|
||
1023 0.155 0.137 0.135 25839
|
||
1024 0.089 0.078 0.080 43875
|
||
2047 0.103 0.092 0.090 38672
|
||
2048 0.060 0.054 0.054 65116
|
||
4095 0.073 0.068 0.068 51405
|
||
4096 0.046 0.042 0.042 82162
|
||
8191 0.060 0.058 0.057 60739
|
||
8192 0.036 0.034 0.034 101467
|
||
16383 0.052 0.052 0.051 68594
|
||
16384 0.031 0.031 0.031 112603
|
||
32767 0.053 0.050 0.049 70850
|
||
32768 0.032 0.029 0.029 119617
|
||
65535 0.067 0.067 0.067 52015
|
||
65536 0.058 0.058 0.058 60440
|
||
131071 0.067 0.066 0.065 53518
|
||
131072 0.059 0.058 0.058 60281
|
||
262143 0.066 0.065 0.065 54005
|
||
262144 0.058 0.058 0.058 60121
|
||
524287 0.067 0.067 0.067 52349
|
||
524288 0.061 0.061 0.064 54699
|
||
1048575 0.068 0.067 0.067 51876
|
||
1048576 0.061 0.061 0.061 56775
|
||
2097151 0.068 0.068 0.068 51379
|
||
2097152 0.062 0.062 0.062 56513
|
||
4194303 0.069 0.068 0.069 50580
|
||
4194304 0.063 0.064 0.063 55751
|
||
8388607 0.120 0.118 0.120 28998
|
||
8388608 0.137 0.123 0.117 29936
|
||
|
||
GCC (Inline REP STOSB) for #c per n where c ≈ 0.273ns
|
||
N x1 x8 x64 mBps
|
||
------------------------------------------------------------
|
||
1 413.000 434.125 441.453 8
|
||
1 431.000 436.125 438.953 8
|
||
2 223.500 224.438 224.836 16
|
||
3 149.000 150.042 623.786 6
|
||
4 108.750 109.531 110.559 32
|
||
7 62.714 63.196 63.266 55
|
||
8 56.375 56.641 56.838 61
|
||
15 30.467 30.708 30.761 113
|
||
16 24.062 24.023 24.038 145
|
||
31 14.548 14.859 14.876 235
|
||
32 9.719 9.691 9.730 359
|
||
63 7.286 7.312 7.339 476
|
||
64 3.609 3.705 3.721 938
|
||
127 1.976 2.058 2.067 1689
|
||
128 0.414 0.405 0.409 8532
|
||
255 0.890 0.907 0.911 3832
|
||
256 0.215 0.217 0.218 16039
|
||
511 0.476 0.481 0.480 7273
|
||
512 0.119 0.119 0.119 29270
|
||
1023 0.257 0.260 0.260 13409
|
||
1024 0.073 0.073 0.074 47442
|
||
2047 0.150 0.150 0.151 23189
|
||
2048 0.049 0.050 0.050 69424
|
||
4095 0.096 0.097 0.097 36142
|
||
4096 0.040 0.040 0.040 87842
|
||
8191 0.071 0.071 0.071 49061
|
||
8192 0.034 0.033 0.034 104099
|
||
16383 0.058 0.059 0.058 59697
|
||
16384 0.030 0.031 0.030 114585
|
||
32767 0.053 0.053 0.053 66161
|
||
32768 0.029 0.029 0.029 120750
|
||
65535 0.069 0.069 0.069 50520
|
||
65536 0.058 0.058 0.058 60100
|
||
131071 0.068 0.067 0.085 40964
|
||
131072 0.076 0.072 0.063 55514
|
||
262143 0.067 0.093 0.090 38681
|
||
262144 0.073 0.062 0.077 45384
|
||
524287 0.107 0.093 0.066 52689
|
||
524288 0.061 0.060 0.062 56294
|
||
1048575 0.066 0.066 0.066 52990
|
||
1048576 0.061 0.061 0.061 57248
|
||
2097151 0.067 0.075 0.067 51887
|
||
2097152 0.061 0.061 0.061 56878
|
||
4194303 0.068 0.100 0.069 50623
|
||
4194304 0.061 0.061 0.061 57195
|
||
8388607 0.117 0.121 0.119 29441
|
||
8388608 0.118 0.119 0.162 21587
|
||
|
||
Musl memset() for #c per n where c ≈ 0.273ns
|
||
N x1 x8 x64 mBps
|
||
------------------------------------------------------------
|
||
1 49.000 35.625 35.172 99
|
||
1 33.000 34.625 35.109 99
|
||
2 17.500 17.562 18.023 194
|
||
3 20.333 14.042 12.411 281
|
||
4 11.250 9.219 9.301 375
|
||
7 11.857 6.018 5.417 644
|
||
8 4.125 4.516 4.592 760
|
||
15 4.200 2.692 2.480 1407
|
||
16 2.312 2.273 2.310 1511
|
||
31 2.097 1.786 1.342 2600
|
||
32 1.219 1.238 1.242 2811
|
||
63 0.841 0.815 0.686 5085
|
||
64 0.641 0.666 0.665 5246
|
||
127 1.000 0.718 0.690 5061
|
||
128 0.477 0.435 0.413 8451
|
||
255 0.459 0.418 0.403 8670
|
||
256 0.285 0.233 0.232 15051
|
||
511 0.256 0.230 0.228 15285
|
||
512 0.158 0.129 0.128 27170
|
||
1023 0.134 0.140 0.138 25296
|
||
1024 0.089 0.077 0.078 44891
|
||
2047 0.094 0.088 0.088 39837
|
||
2048 0.060 0.052 0.053 66075
|
||
4095 0.071 0.068 0.068 51359
|
||
4096 0.045 0.043 0.042 83178
|
||
8191 0.059 0.058 0.057 60868
|
||
8192 0.037 0.035 0.034 102662
|
||
16383 0.052 0.051 0.051 68658
|
||
16384 0.032 0.031 0.031 113568
|
||
32767 0.050 0.049 0.049 71296
|
||
32768 0.030 0.029 0.029 120029
|
||
65535 0.067 0.067 0.068 50983
|
||
65536 0.059 0.059 0.058 59665
|
||
131071 0.067 0.067 0.067 52014
|
||
131072 0.059 0.060 0.059 59211
|
||
262143 0.067 0.066 0.066 52877
|
||
262144 0.059 0.060 0.085 40900
|
||
524287 0.067 0.066 0.065 53688
|
||
524288 0.059 0.059 0.059 59112
|
||
1048575 0.066 0.066 0.066 53181
|
||
1048576 0.060 0.060 0.060 58300
|
||
2097151 0.066 0.066 0.067 52439
|
||
2097152 0.060 0.068 0.060 57924
|
||
4194303 0.069 0.067 0.080 43425
|
||
4194304 0.062 0.080 0.062 56085
|
||
8388607 0.126 0.118 0.133 26207
|
||
8388608 0.127 0.119 0.118 29643
|
||
|
||
Newlib memset() for #c per n where c ≈ 0.273ns
|
||
N x1 x8 x64 mBps
|
||
------------------------------------------------------------
|
||
1 443.000 440.875 440.078 8
|
||
1 437.000 437.375 440.453 8
|
||
2 226.500 226.438 227.461 15
|
||
3 150.333 150.625 151.151 23
|
||
4 113.250 113.281 113.770 31
|
||
7 66.714 67.232 66.998 52
|
||
8 58.375 58.828 58.811 59
|
||
15 31.000 30.858 31.264 112
|
||
16 31.438 28.523 28.317 123
|
||
31 27.839 29.536 50.533 69
|
||
32 11.281 10.918 11.068 315
|
||
63 12.302 11.907 11.863 294
|
||
64 4.703 4.396 4.404 793
|
||
127 2.732 2.719 2.712 1287
|
||
128 0.852 0.729 0.736 4742
|
||
255 1.188 1.178 1.171 2981
|
||
256 0.652 0.416 0.381 9171
|
||
511 1.474 1.629 1.662 2099
|
||
512 0.287 0.264 0.246 14204
|
||
1023 0.873 0.934 0.947 3684
|
||
1024 0.196 0.179 0.178 19604
|
||
2047 0.544 0.545 0.626 5572
|
||
2048 0.257 0.257 0.253 13779
|
||
4095 0.426 0.427 0.430 8110
|
||
4096 0.282 0.296 0.293 11917
|
||
8191 0.374 0.370 0.371 9402
|
||
8192 0.297 0.310 0.400 8717
|
||
16383 0.346 0.345 0.433 8062
|
||
16384 0.313 0.312 0.311 11223
|
||
32767 0.334 0.332 0.332 10505
|
||
32768 0.313 0.313 0.358 9759
|
||
65535 0.335 0.327 0.330 10589
|
||
65536 0.330 0.312 0.337 10347
|
||
131071 0.350 0.339 0.355 9825
|
||
131072 0.334 0.329 0.359 9728
|
||
262143 0.346 0.352 0.357 9785
|
||
262144 0.350 0.375 0.482 7243
|
||
524287 0.348 0.346 0.360 9691
|
||
524288 0.347 0.346 0.385 9063
|
||
1048575 0.358 0.375 0.383 9114
|
||
1048576 0.355 0.382 0.388 8987
|
||
2097151 0.362 0.368 0.390 8956
|
||
2097152 0.363 0.375 0.387 9016
|
||
4194303 0.361 0.379 0.385 9073
|
||
4194304 0.366 0.376 0.385 9074
|
||
8388607 0.363 0.366 0.372 9391
|
||
8388608 0.419 0.374 0.370 9428 */
|