2020-06-16 13:38:43 +00:00
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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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2020-06-15 14:18:57 +00:00
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│vi: set et ft=asm ts=8 sw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚──────────────────────────────────────────────────────────────────────────────╝
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@fileoverview Cosmopolitan Memory Setter
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This sets one bit per picosecond on a $900 Skylake workstation,
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which is about 110 GBps. */
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#include "libc/nexgen32e/x86feature.h"
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#include "libc/nexgen32e/macros.h"
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#include "libc/macros.h"
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2020-06-16 02:01:28 +00:00
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.source __FILE__
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2020-06-15 14:18:57 +00:00
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/ Sets memory.
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/
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/ @param rdi is dest
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/ @param esi is the byte to set
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/ @param edx is the number of bytes to set
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/ @return original rdi copied to rax
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/ @mode long
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/ @asyncsignalsafe
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memset: mov %rdi,%rax
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/ fallthrough
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/ Sets memory w/ minimal-impact ABI.
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/
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/ @param rdi is dest
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/ @param esi is the byte to set
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/ @param edx is the number of bytes to set
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/ @clob flags,xmm3
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/ @mode long
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_memset:.leafprologue
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.profilable
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push %rbx
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push %rcx
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movd %esi,%xmm3
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mov $.Lmemsettab.ro.size,%ecx
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cmp %rcx,%rdx
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cmovb %rdx,%rcx
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ezlea memsettab,bx
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jmp *(%rbx,%rcx,8)
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.Lanchorpoint:
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.L32r: cmp $1024,%rdx
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jae .Lerms
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.L32: vpbroadcastb %xmm3,%ymm3
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mov $32,%ecx
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1: lea 32(%rcx),%rcx
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vmovdqu %ymm3,-64(%rdi,%rcx)
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cmp %rcx,%rdx
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ja 1b
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vmovdqu %ymm3,-32(%rdi,%rdx)
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vxorps %ymm3,%ymm3,%ymm3
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jmp .L0
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.L16r: cmp $1024,%rdx
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jae .Lerms
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.L16: pbroadcastb %xmm3
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mov $16,%ecx
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1: lea 16(%rcx),%rcx
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movdqu %xmm3,-32(%rdi,%rcx)
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cmp %rcx,%rdx
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ja 1b
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movdqu %xmm3,-16(%rdi,%rdx)
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xorps %xmm3,%xmm3
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.L0: pop %rcx
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pop %rbx
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.leafepilogue
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.L8: movzbq %sil,%rbx
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mov $0x0101010101010101,%rcx
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imul %rcx,%rbx
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mov %rbx,(%rdi)
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mov %rbx,-8(%rdi,%rdx)
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jmp .L0
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.L4: movzbl %sil,%ebx
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mov $0x01010101,%ecx
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imul %ecx,%ebx
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mov %ebx,(%rdi)
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mov %ebx,-4(%rdi,%rdx)
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jmp .L0
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.L3: mov %sil,2(%rdi)
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.L2: mov %sil,1(%rdi)
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.L1: mov %sil,(%rdi)
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jmp .L0
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.Lerms: push %rax
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push %rdi
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mov %esi,%eax
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mov %rdx,%rcx
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rep stosb
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pop %rdi
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pop %rax
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jmp .L0
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.endfn _memset,globl,hidden
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.endfn memset,globl
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.initro 300,_init_memset
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memsettab.ro:
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.byte .L0 - .Lanchorpoint
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.byte .L1 - .Lanchorpoint
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.byte .L2 - .Lanchorpoint
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.byte .L3 - .Lanchorpoint
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.rept 4
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.byte .L4 - .Lanchorpoint
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.endr
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.rept 8
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.byte .L8 - .Lanchorpoint
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.endr
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.rept 16
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.byte .L16 - .Lanchorpoint
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.endr
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.equ .Lmemsettab.ro.size,.-memsettab.ro
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.endobj memsettab.ro
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.if .Lmemsettab.ro.size % 8
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.error "moar jmptab"
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.endif
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.byte .L16 - .Lanchorpoint # SSE2
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.byte .L16r - .Lanchorpoint # SSE2 + ERMS
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.byte .L32 - .Lanchorpoint # AVX2
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.byte .L32r - .Lanchorpoint # AVX2 + ERMS
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.byte 0,0,0,0
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.previous
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.initbss 300,_init_memset
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memsettab:
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.rept .Lmemsettab.ro.size
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.quad 0
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.endr
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.quad 0
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.endobj memsettab
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.previous
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.init.start 300,_init_memset
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pushpop .Lmemsettab.ro.size,%rcx
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ezlea .Lanchorpoint,dx
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testb X86_HAVE(AVX2)+kCpuids(%rip)
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call memjmpinit
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.init.end 300,_init_memset
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/* benchmarks on intel core i7-6700 @ 3.40GHz (skylake)
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includes function call overhead (unless marked otherwise)
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Your memset() for #c per n where c ≈ 0.273ns
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N x1 x8 x64 mBps
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------------------------------------------------------------
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1 73.000 35.125 36.141 97
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1 35.000 36.375 35.984 97
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2 28.500 19.938 18.820 185
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3 19.000 12.458 12.651 276
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4 15.750 10.719 9.566 365
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7 5.000 5.411 5.730 609
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8 8.375 4.953 4.697 743
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15 4.200 2.408 2.407 1450
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16 7.188 2.539 2.382 1465 «
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31 1.129 1.206 1.183 2950
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32 15.156 2.012 1.292 2702
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63 4.016 0.986 0.663 5264
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64 3.547 0.967 0.684 5104
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127 2.087 0.562 0.338 10311
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128 1.805 0.499 0.336 10393
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255 0.412 0.180 0.183 19119
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256 0.160 0.170 0.169 20650
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511 0.162 0.134 0.108 32214
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512 0.100 0.106 0.104 33507
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1023 0.110 0.095 0.082 42574
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1024 0.099 0.080 0.078 44944
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2047 0.155 0.154 0.154 22624
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2048 0.052 0.052 0.053 66266
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4095 0.098 0.099 0.099 35142
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4096 0.042 0.042 0.041 84250
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8191 0.072 0.073 0.072 48157
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8192 0.034 0.034 0.034 101332
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16383 0.059 0.059 0.059 58997
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16384 0.031 0.031 0.031 112972
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32767 0.054 0.054 0.054 65053
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32768 0.029 0.029 0.029 119433
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65535 0.069 0.069 0.068 51690
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65536 0.057 0.057 0.057 61434
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131071 0.066 0.066 0.066 53001
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131072 0.057 0.058 0.057 60716
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262143 0.066 0.065 0.065 53462
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262144 0.060 0.058 0.058 60104
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524287 0.067 0.068 0.072 48784
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524288 0.063 0.062 0.061 56957
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1048575 0.068 0.068 0.069 50353
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1048576 0.062 0.060 0.062 56661
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2097151 0.066 0.066 0.067 52421
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2097152 0.060 0.060 0.061 57672
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4194303 0.072 0.067 0.067 51910
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4194304 0.062 0.061 0.062 56327
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8388607 0.129 0.111 0.111 31368
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8388608 0.136 0.119 0.111 31519
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glibc memset() for #c per n where c ≈ 0.273ns
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N x1 x8 x64 mBps
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------------------------------------------------------------
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1 121.000 39.125 35.547 98
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1 33.000 35.875 35.172 99
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2 17.500 18.312 18.070 193
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3 16.333 14.542 12.411 281
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4 12.250 9.344 9.215 379
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7 7.571 5.732 5.453 640
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8 4.625 4.641 4.623 755
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15 4.467 3.158 2.478 1408
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16 2.312 2.289 2.468 1414
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31 2.290 1.367 1.278 2731
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32 1.219 1.176 1.182 2952
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63 0.905 0.696 0.656 5320
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64 0.672 0.658 0.660 5285
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127 1.299 0.723 0.673 5183
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128 0.508 0.423 0.424 8227
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255 0.490 0.428 0.417 8367
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256 0.293 0.233 0.243 14349
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511 0.284 0.232 0.234 14902
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512 0.154 0.131 0.131 26626
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1023 0.155 0.137 0.135 25839
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1024 0.089 0.078 0.080 43875
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2047 0.103 0.092 0.090 38672
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2048 0.060 0.054 0.054 65116
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4095 0.073 0.068 0.068 51405
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4096 0.046 0.042 0.042 82162
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8191 0.060 0.058 0.057 60739
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8192 0.036 0.034 0.034 101467
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16383 0.052 0.052 0.051 68594
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16384 0.031 0.031 0.031 112603
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32767 0.053 0.050 0.049 70850
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32768 0.032 0.029 0.029 119617
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65535 0.067 0.067 0.067 52015
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65536 0.058 0.058 0.058 60440
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131071 0.067 0.066 0.065 53518
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131072 0.059 0.058 0.058 60281
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262143 0.066 0.065 0.065 54005
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262144 0.058 0.058 0.058 60121
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524287 0.067 0.067 0.067 52349
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524288 0.061 0.061 0.064 54699
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1048575 0.068 0.067 0.067 51876
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1048576 0.061 0.061 0.061 56775
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2097151 0.068 0.068 0.068 51379
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2097152 0.062 0.062 0.062 56513
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4194303 0.069 0.068 0.069 50580
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4194304 0.063 0.064 0.063 55751
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8388607 0.120 0.118 0.120 28998
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8388608 0.137 0.123 0.117 29936
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GCC (Inline REP STOSB) for #c per n where c ≈ 0.273ns
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N x1 x8 x64 mBps
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------------------------------------------------------------
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1 413.000 434.125 441.453 8
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1 431.000 436.125 438.953 8
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2 223.500 224.438 224.836 16
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3 149.000 150.042 623.786 6
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4 108.750 109.531 110.559 32
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7 62.714 63.196 63.266 55
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8 56.375 56.641 56.838 61
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15 30.467 30.708 30.761 113
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16 24.062 24.023 24.038 145
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31 14.548 14.859 14.876 235
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32 9.719 9.691 9.730 359
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63 7.286 7.312 7.339 476
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64 3.609 3.705 3.721 938
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127 1.976 2.058 2.067 1689
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128 0.414 0.405 0.409 8532
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255 0.890 0.907 0.911 3832
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256 0.215 0.217 0.218 16039
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511 0.476 0.481 0.480 7273
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512 0.119 0.119 0.119 29270
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1023 0.257 0.260 0.260 13409
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1024 0.073 0.073 0.074 47442
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2047 0.150 0.150 0.151 23189
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2048 0.049 0.050 0.050 69424
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4095 0.096 0.097 0.097 36142
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4096 0.040 0.040 0.040 87842
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8191 0.071 0.071 0.071 49061
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8192 0.034 0.033 0.034 104099
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16383 0.058 0.059 0.058 59697
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16384 0.030 0.031 0.030 114585
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32767 0.053 0.053 0.053 66161
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32768 0.029 0.029 0.029 120750
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65535 0.069 0.069 0.069 50520
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65536 0.058 0.058 0.058 60100
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131071 0.068 0.067 0.085 40964
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131072 0.076 0.072 0.063 55514
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262143 0.067 0.093 0.090 38681
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262144 0.073 0.062 0.077 45384
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|
|
|
|
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 */
|
