44 lines
2.4 KiB
ArmAsm
44 lines
2.4 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/dce.h"
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#include "libc/macros.h"
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#include "libc/nexgen32e/x86feature.h"
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#include "libc/notice.inc"
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/ Computes 32-bit Castagnoli Cyclic Redundancy Check.
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/
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/ @param edi is the initial hash value (0 is fine)
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/ @param rsi points to the data
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/ @param rdx is the byte size of data
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/ @return eax is the new hash value
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/ @note Used by ISCSI, TensorFlow, etc.
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.initbss 300,_init_crc32c
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crc32c: .quad 0
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.endobj crc32c,globl
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.previous
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.init.start 300,_init_crc32c
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ezlea crc32c$pure,ax
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ezlea crc32c$sse42,cx
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testb X86_HAVE(SSE4_2)+kCpuids(%rip)
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cmovnz %rcx,%rax
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stosq
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.init.end 300,_init_crc32c
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.source __FILE__
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