diff options
Diffstat (limited to 'src/hash/crc32/crc32_arm64.s')
| -rw-r--r-- | src/hash/crc32/crc32_arm64.s | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/src/hash/crc32/crc32_arm64.s b/src/hash/crc32/crc32_arm64.s new file mode 100644 index 0000000..53274c5 --- /dev/null +++ b/src/hash/crc32/crc32_arm64.s @@ -0,0 +1,91 @@ +// 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 |