| // 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) |
| |
| update: |
| CMP $16, R11 |
| BLT less_than_16 |
| LDP.P 16(R13), (R8, R10) |
| CRC32CX R8, R9 |
| CRC32CX R10, R9 |
| SUB $16, R11 |
| |
| JMP update |
| |
| less_than_16: |
| TBZ $3, R11, less_than_8 |
| |
| MOVD.P 8(R13), R10 |
| CRC32CX R10, R9 |
| |
| 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) |
| |
| update: |
| CMP $16, R11 |
| BLT less_than_16 |
| LDP.P 16(R13), (R8, R10) |
| CRC32X R8, R9 |
| CRC32X R10, R9 |
| SUB $16, R11 |
| |
| JMP update |
| |
| less_than_16: |
| TBZ $3, R11, less_than_8 |
| |
| MOVD.P 8(R13), R10 |
| CRC32X R10, R9 |
| |
| 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 |
