mirror of
https://github.com/go-gitea/gitea.git
synced 2024-11-01 08:47:40 -04:00
68 lines
1.2 KiB
ArmAsm
68 lines
1.2 KiB
ArmAsm
// Copyright 2011 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.
|
|
|
|
// +build gc
|
|
|
|
#define NOSPLIT 4
|
|
#define RODATA 8
|
|
|
|
// func castagnoliSSE42(crc uint32, p []byte) uint32
|
|
TEXT ·castagnoliSSE42(SB), NOSPLIT, $0
|
|
MOVL crc+0(FP), AX // CRC value
|
|
MOVL p+4(FP), SI // data pointer
|
|
MOVL p_len+8(FP), CX // len(p)
|
|
|
|
NOTL AX
|
|
|
|
// If there's less than 8 bytes to process, we do it byte-by-byte.
|
|
CMPQ CX, $8
|
|
JL cleanup
|
|
|
|
// Process individual bytes until the input is 8-byte aligned.
|
|
startup:
|
|
MOVQ SI, BX
|
|
ANDQ $7, BX
|
|
JZ aligned
|
|
|
|
CRC32B (SI), AX
|
|
DECQ CX
|
|
INCQ SI
|
|
JMP startup
|
|
|
|
aligned:
|
|
// The input is now 8-byte aligned and we can process 8-byte chunks.
|
|
CMPQ CX, $8
|
|
JL cleanup
|
|
|
|
CRC32Q (SI), AX
|
|
ADDQ $8, SI
|
|
SUBQ $8, CX
|
|
JMP aligned
|
|
|
|
cleanup:
|
|
// We may have some bytes left over that we process one at a time.
|
|
CMPQ CX, $0
|
|
JE done
|
|
|
|
CRC32B (SI), AX
|
|
INCQ SI
|
|
DECQ CX
|
|
JMP cleanup
|
|
|
|
done:
|
|
NOTL AX
|
|
MOVL AX, ret+16(FP)
|
|
RET
|
|
|
|
// func haveSSE42() bool
|
|
TEXT ·haveSSE42(SB), NOSPLIT, $0
|
|
XORQ AX, AX
|
|
INCL AX
|
|
CPUID
|
|
SHRQ $20, CX
|
|
ANDQ $1, CX
|
|
MOVB CX, ret+0(FP)
|
|
RET
|
|
|