45 lines
2.5 KiB
ArmAsm
45 lines
2.5 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
|
|
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ This program is free software; you can redistribute it and/or modify │
|
|
│ it under the terms of the GNU General Public License as published by │
|
|
│ the Free Software Foundation; version 2 of the License. │
|
|
│ │
|
|
│ This program is distributed in the hope that it will be useful, but │
|
|
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
|
|
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
|
|
│ General Public License for more details. │
|
|
│ │
|
|
│ You should have received a copy of the GNU General Public License │
|
|
│ along with this program; if not, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/dce.h"
|
|
#include "libc/macros.h"
|
|
#include "libc/nexgen32e/x86feature.h"
|
|
#include "libc/notice.inc"
|
|
|
|
/ Computes 32-bit Castagnoli Cyclic Redundancy Check.
|
|
/
|
|
/ @param edi is the initial hash value (0 is fine)
|
|
/ @param rsi points to the data
|
|
/ @param rdx is the byte size of data
|
|
/ @return eax is the new hash value
|
|
/ @note Used by ISCSI, TensorFlow, etc.
|
|
.initbss 300,_init_crc32c
|
|
crc32c: .quad 0
|
|
.endobj crc32c,globl
|
|
.previous
|
|
|
|
.init.start 300,_init_crc32c
|
|
ezlea crc32c$pure,ax
|
|
ezlea crc32c$sse42,cx
|
|
testb X86_HAVE(SSE4_2)+kCpuids(%rip)
|
|
cmovnz %rcx,%rax
|
|
stosq
|
|
.init.end 300,_init_crc32c
|
|
.source __FILE__
|