be41ee72e0
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
/*-
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* Copyright (c) 2017 Michael Tuexen
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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.arch armv8-a+crc
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/*
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* uint32_t
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* armv8_crc32c(uint32_t crc, const unsigned char *buf, unsigned int len)
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*/
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ENTRY(armv8_crc32c)
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cbz w2, end
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tbz x1, #0x0, half_word_aligned
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sub w2, w2, 0x1
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ldr w10, [x1], #0x1
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crc32cb w0, w0, w10
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half_word_aligned:
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cmp w2, #0x2
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b.lo last_byte
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tbz x1, #0x1, word_aligned
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sub w2, w2, 0x2
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ldr w10, [x1], #0x2
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crc32ch w0, w0, w10
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word_aligned:
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cmp w2, #0x4
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b.lo last_half_word
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tbz x1, #0x2, double_word_aligned
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sub w2, w2, 0x4
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ldr w10, [x1], #0x4
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crc32cw w0, w0, w10
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double_word_aligned:
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lsr w9, w2, #0x3
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cbz w9, last_word
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loop:
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ldr x10, [x1], #0x8
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crc32cx w0, w0, x10
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subs w9, w9, #1
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b.ne loop
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last_word:
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tbz w2, #0x2, last_half_word
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ldr w10, [x1], #0x4
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crc32cw w0, w0, w10
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last_half_word:
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tbz w2, #0x1, last_byte
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ldr w10, [x1], #0x2
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crc32ch w0, w0, w10
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last_byte:
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tbz w2, #0x0, end
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ldr w10, [x1], #0x1
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crc32cb w0, w0, w10
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end:
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ret
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END(armv8_crc32c)
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