Release 4.14 arch/nios2/lib/memset.c

/*
 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
 * Copyright (C) 2004 Microtronix Datacom Ltd
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/types.h>
#include <linux/string.h>



void *memset(void *s, int c, size_t count)
{
	int destptr, charcnt, dwordcnt, fill8reg, wrkrega;

	if (!count)
		return s;

	c &= 0xFF;

	if (count <= 8) {
		char *xs = (char *) s;

		while (count--)
			*xs++ = c;
		return s;
	}

	__asm__ __volatile__ (
		/* fill8 %3, %5 (c & 0xff) */
		"       slli    %4, %5, 8\n"
                "       or      %4, %4, %5\n"
                "       slli    %3, %4, 16\n"
                "       or      %3, %3, %4\n"
		/* Word-align %0 (s) if necessary */
		"       andi    %4, %0, 0x01\n"
                "       beq     %4, zero, 1f\n"
                "       addi    %1, %1, -1\n"
                "       stb     %3, 0(%0)\n"
                "       addi    %0, %0, 1\n"
                "1:     mov     %2, %1\n"
		/* Dword-align %0 (s) if necessary */
		"       andi    %4, %0, 0x02\n"
                "       beq     %4, zero, 2f\n"
                "       addi    %1, %1, -2\n"
                "       sth     %3, 0(%0)\n"
                "       addi    %0, %0, 2\n"
                "       mov     %2, %1\n"
		/* %1 and %2 are how many more bytes to set */
		"2:     srli    %2, %2, 2\n"
		/* %2 is how many dwords to set */
		"3:     stw     %3, 0(%0)\n"
                "       addi    %0, %0, 4\n"
                "       addi    %2, %2, -1\n"
                "       bne     %2, zero, 3b\n"
		/* store residual word and/or byte if necessary */
		"       andi    %4, %1, 0x02\n"
                "       beq     %4, zero, 4f\n"
                "       sth     %3, 0(%0)\n"
                "       addi    %0, %0, 2\n"
		/* store residual byte if necessary */
		"4:     andi    %4, %1, 0x01\n"
                "       beq     %4, zero, 5f\n"
                "       stb     %3, 0(%0)\n"
                "5:\n"
                : "=r" (destptr),	/* %0  Output */
		  "=r" (charcnt),	/* %1  Output */
		  "=r" (dwordcnt),	/* %2  Output */
		  "=r" (fill8reg),	/* %3  Output */
		  "=&r" (wrkrega)	/* %4  Output only */
		: "r" (c),		/* %5  Input */
		  "0" (s),		/* %0  Input/Output */
		  "1" (count)		/* %1  Input/Output */
		: "memory"		/* clobbered */
	);

	return s;
}
Contributors
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Ley Foon Tan
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Total
109
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Overall Contributors
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Total
116
100.00%
2
100.00%
Directory: arch/nios2/lib

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