path: root/include/asm-generic/xor.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * include/asm-generic/xor.h
 *
 * Generic optimized RAID-5 checksumming functions.
 */

#include <linux/prefetch.h>

static void
xor_8regs_2(unsigned long bytes, unsigned long *p1, unsigned long *p2)
{
	long lines = bytes / (sizeof (long)) / 8;

	do {
		p1[0] ^= p2[0];
		p1[1] ^= p2[1];
		p1[2] ^= p2[2];
		p1[3] ^= p2[3];
		p1[4] ^= p2[4];
		p1[5] ^= p2[5];
		p1[6] ^= p2[6];
		p1[7] ^= p2[7];
		p1 += 8;
		p2 += 8;
	} while (--lines > 0);
}

static void
xor_8regs_3(unsigned long bytes, unsigned long *p1, unsigned long *p2,
	    unsigned long *p3)
{
	long lines = bytes / (sizeof (long)) / 8;

	do {
		p1[0] ^= p2[0] ^ p3[0];
		p1[1] ^= p2[1] ^ p3[1];
		p1[2] ^= p2[2] ^ p3[2];
		p1[3] ^= p2[3] ^ p3[3];
		p1[4] ^= p2[4] ^ p3[4];
		p1[5] ^= p2[5] ^ p3[5];
		p1[6] ^= p2[6] ^ p3[6];
		p1[7] ^= p2[7] ^ p3[7];
		p1 += 8;
		p2 += 8;
		p3 += 8;
	} while (--lines > 0);
}

static void
xor_8regs_4(unsigned long bytes, unsigned long *p1, unsigned long *p2,
	    unsigned long *p3, unsigned long *p4)
{
	long lines = bytes / (sizeof (long)) / 8;

	do {
		p1[0] ^= p2[0] ^ p3[0] ^ p4[0];
		p1[1] ^= p2[1] ^ p3[1] ^ p4[1];
		p1[2] ^= p2[2] ^ p3[2] ^ p4[2];
		p1[3] ^= p2[3] ^ p3[3] ^ p4[3];
		p1[4] ^= p2[4] ^ p3[4] ^ p4[4];
		p1[5] ^= p2[5] ^ p3[5] ^ p4[5];
		p1[6] ^= p2[6] ^ p3[6] ^ p4[6];
		p1[7] ^= p2[7] ^ p3[7] ^ p4[7];
		p1 += 8;
		p2 += 8;
		p3 += 8;
		p4 += 8;
	} while (--lines > 0);
}

static void
xor_8regs_5(unsigned long bytes, unsigned long *p1, unsigned long *p2,
	    unsigned long *p3, unsigned long *p4, unsigned long *p5)
{
	long lines = bytes / (sizeof (long)) / 8;

	do {
		p1[0] ^= p2[0] ^ p3[0] ^ p4[0] ^ p5[0];
		p1[1] ^= p2[1] ^ p3[1] ^ p4[1] ^ p5[1];
		p1[2] ^= p2[2] ^ p3[2] ^ p4[2] ^ p5[2];
		p1[3] ^= p2[3] ^ p3[3] ^ p4[3] ^ p5[3];
		p1[4] ^= p2[4] ^ p3[4] ^ p4[4] ^ p5[4];
		p1[5] ^= p2[5] ^ p3[5] ^ p4[5] ^ p5[5];
		p1[6] ^= p2[6] ^ p3[6] ^ p4[6] ^ p5[6];
		p1[7] ^= p2[7] ^ p3[7] ^ p4[7] ^ p5[7];
		p1 += 8;
		p2 += 8;
		p3 += 8;
		p4 += 8;
		p5 += 8;
	} while (--lines > 0);
}

static void
xor_32regs_2(unsigned long bytes, unsigned long *p1, unsigned long *p2)
{
	long lines = bytes / (sizeof (long)) / 8;

	do {
		register long d0, d1, d2, d3, d4, d5, d6, d7;
		d0 = p1[0];	/* Pull the stuff into registers	*/
		d1 = p1[1];	/*  ... in bursts, if possible.		*/
		d2 = p1[2];
		d3 = p1[3];
		d4 = p1[4];
		d5 = p1[5];
		d6 = p1[6];
		d7 = p1[7];
		d0 ^= p2[0];
		d1 ^= p2[1];
		d2 ^= p2[2];
		d3 ^= p2[3];
		d4 ^= p2[4];
		d5 ^= p2[5];
		d6 ^= p2[6];
		d7 ^= p2[7];
		p1[0] = d0;	/* Store the result (in bursts)		*/
		p1[1] = d1;
		p1[2] = d2;
		p1[3] = d3;
		p1[4] = d4;
		p1[5] = d5;
		p1[6] = d6;
		p1[7] = d7;
		p1 += 8;
		p2 += 8;
	} while (--lines > 0);
}

static void
xor_32regs_3(unsigned long bytes, unsigned long *p1, unsigned long *p2,
	    unsigned long *p3)
{
	long lines = bytes / (sizeof (long)) / 8;

	do {
		register long d0, d1, d2, d3, d4, d5, d6, d7;
		d0 = p1[0];	/* Pull the stuff into registers	*/
		d1 = p1[1];	/*  ... in bursts, if possible.		*/
		d2 = p1[2];
		d3 = p1[3];
		d4 = p1[4];
		d5 = p1[5];
		d6 = p1[6];
		d7 = p1[7];
		d0 ^= p2[0];
		d1 ^= p2[1];
		d2 ^= p2[2];
		d3 ^= p2[3];
		d4 ^= p2[4];
		d5 ^= p2[5];
		d6 ^= p2[6];
		d7 ^= p2[7];
		d0 ^= p3[0];
		d1 ^= p3[1];
		d2 ^= p3[2];
		d3 ^= p3[3];
		d4 ^= p3[4];
		d5 ^= p3[5];
		d6 ^= p3[6];
		d7 ^= p3[7];
		p1[0] = d0;	/* Store the result (in bursts)		*/
		p1[1] = d1;
		p1[2] = d2;
		p1[3] = d3;
		p1[4] = d4;
		p1[5] = d5;
		p1[6] = d6;
		p1<