/
crc32_arm64.s
97 lines (69 loc) · 1.59 KB
/
crc32_arm64.s
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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
// castagnoliUpdate updates the non-inverted crc with the given data.
// func castagnoliUpdate(crc uint32, p []byte) uint32
TEXT ·castagnoliUpdate(SB),NOSPLIT,$0-36
MOVWU crc+0(FP), R9 // CRC value
MOVD p+8(FP), R13 // data pointer
MOVD p_len+16(FP), R11 // len(p)
CMP $8, R11
BLT less_than_8
update:
MOVD.P 8(R13), R10
CRC32CX R10, R9
SUB $8, R11
CMP $8, R11
BLT less_than_8
JMP update
less_than_8:
TBZ $2, R11, less_than_4
MOVWU.P 4(R13), R10
CRC32CW R10, R9
less_than_4:
TBZ $1, R11, less_than_2
MOVHU.P 2(R13), R10
CRC32CH R10, R9
less_than_2:
TBZ $0, R11, done
MOVBU (R13), R10
CRC32CB R10, R9
done:
MOVWU R9, ret+32(FP)
RET
// ieeeUpdate updates the non-inverted crc with the given data.
// func ieeeUpdate(crc uint32, p []byte) uint32
TEXT ·ieeeUpdate(SB),NOSPLIT,$0-36
MOVWU crc+0(FP), R9 // CRC value
MOVD p+8(FP), R13 // data pointer
MOVD p_len+16(FP), R11 // len(p)
CMP $8, R11
BLT less_than_8
update:
MOVD.P 8(R13), R10
CRC32X R10, R9
SUB $8, R11
CMP $8, R11
BLT less_than_8
JMP update
less_than_8:
TBZ $2, R11, less_than_4
MOVWU.P 4(R13), R10
CRC32W R10, R9
less_than_4:
TBZ $1, R11, less_than_2
MOVHU.P 2(R13), R10
CRC32H R10, R9
less_than_2:
TBZ $0, R11, done
MOVBU (R13), R10
CRC32B R10, R9
done:
MOVWU R9, ret+32(FP)
RET
// func supportsCRC32() bool
TEXT ·supportsCRC32(SB),NOSPLIT,$0-1
MOVB runtime·supportCRC32(SB), R0
MOVB R0, ret+0(FP)
RET