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// 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.
#include "textflag.h"
// 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
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