c2aa86d19c
With Clang 5.0 the .arch directive is required, otherwise Clang complains "error: instruction requires: crc". This was reported in D10499 but not added initially, because clang 3.8 available on a ref machine reported unknown directive. Clang 4.0 allows but does not require the directive. Submitted by: andrew MFC after: 1 week Sponsored by: The FreeBSD Foundation
80 lines
2.3 KiB
ArmAsm
80 lines
2.3 KiB
ArmAsm
/*-
|
|
* Copyright (c) 2017 Michael Tuexen
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
__FBSDID("$FreeBSD$");
|
|
.arch armv8-a+crc
|
|
|
|
/*
|
|
* uint32_t
|
|
* armv8_crc32c(uint32_t crc, const unsigned char *buf, unsigned int len)
|
|
*/
|
|
|
|
ENTRY(armv8_crc32c)
|
|
cbz w2, end
|
|
tbz x1, #0x0, half_word_aligned
|
|
sub w2, w2, 0x1
|
|
ldr w10, [x1], #0x1
|
|
crc32cb w0, w0, w10
|
|
half_word_aligned:
|
|
cmp w2, #0x2
|
|
b.lo last_byte
|
|
tbz x1, #0x1, word_aligned
|
|
sub w2, w2, 0x2
|
|
ldr w10, [x1], #0x2
|
|
crc32ch w0, w0, w10
|
|
word_aligned:
|
|
cmp w2, #0x4
|
|
b.lo last_half_word
|
|
tbz x1, #0x2, double_word_aligned
|
|
sub w2, w2, 0x4
|
|
ldr w10, [x1], #0x4
|
|
crc32cw w0, w0, w10
|
|
double_word_aligned:
|
|
lsr w9, w2, #0x3
|
|
cbz w9, last_word
|
|
loop:
|
|
ldr x10, [x1], #0x8
|
|
crc32cx w0, w0, x10
|
|
subs w9, w9, #1
|
|
b.ne loop
|
|
last_word:
|
|
tbz w2, #0x2, last_half_word
|
|
ldr w10, [x1], #0x4
|
|
crc32cw w0, w0, w10
|
|
last_half_word:
|
|
tbz w2, #0x1, last_byte
|
|
ldr w10, [x1], #0x2
|
|
crc32ch w0, w0, w10
|
|
last_byte:
|
|
tbz w2, #0x0, end
|
|
ldr w10, [x1], #0x1
|
|
crc32cb w0, w0, w10
|
|
end:
|
|
ret
|
|
END(armv8_crc32c)
|