lib/raid/xor/xor-32regs.c

Source file repositories/reference/linux-study-clean/lib/raid/xor/xor-32regs.c

File Facts

System
Linux kernel
Corpus path
lib/raid/xor/xor-32regs.c
Extension
.c
Size
4174 bytes
Lines
218
Domain
Kernel Services
Bucket
lib
Inferred role
Kernel Services: implementation source
Status
source implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
#include "xor_impl.h"

static void
xor_32regs_2(unsigned long bytes, unsigned long * __restrict p1,
	     const unsigned long * __restrict 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 * __restrict p1,
	     const unsigned long * __restrict p2,
	     const unsigned long * __restrict 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[7] = d7;
		p1 += 8;
		p2 += 8;
		p3 += 8;
	} while (--lines > 0);
}

static void
xor_32regs_4(unsigned long bytes, unsigned long * __restrict p1,
	     const unsigned long * __restrict p2,

Annotation

Implementation Notes