// instruction.
//
//go:noescape
func castagnoliSSE42(crc uint32, p []byte) uint32

// castagnoliSSE42Triple is defined in crc32_amd64.s and uses the SSE 4.2 CRC32
// instruction.
//
//go:noescape
func castagnoliSSE42Triple(
	crcA, crcB, crcC uint32,
	a, b, c []byte,
	rounds uint32,
) (retA uint32, retB uint32, retC uint32)

	CRC32B (SI), AX

done:
	MOVL AX, ret+32(FP)
	RET

// castagnoliSSE42Triple updates three (non-inverted) crcs with (24*rounds)
// bytes from each buffer.
//
// func castagnoliSSE42Triple(
//     crc1, crc2, crc3 uint32,
//     a, b, c []byte,
//     rounds uint32,
// ) (retA uint32, retB uint32, retC uint32)
TEXT ·castagnoliSSE42Triple(SB),NOSPLIT,$0
	MOVL crcA+0(FP), AX
	MOVL crcB+4(FP), CX
	MOVL crcC+8(FP), DX