49 lines
966 B
C
49 lines
966 B
C
/*
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* Copyright (c) 2013-2020, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <stddef.h>
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#include <string.h>
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#include <stdint.h>
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void *memset(void *dst, int val, size_t count)
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{
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char *ptr = dst;
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uint64_t *ptr64;
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uint64_t fill = (unsigned char)val;
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/* Simplify code below by making sure we write at least one byte. */
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if (count == 0) {
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return dst;
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}
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/* Handle the first part, until the pointer becomes 64-bit aligned. */
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while (((uintptr_t)ptr & 7)) {
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*ptr++ = val;
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if (--count == 0) {
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return dst;
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}
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}
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/* Duplicate the fill byte to the rest of the 64-bit word. */
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fill |= fill << 8;
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fill |= fill << 16;
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fill |= fill << 32;
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/* Use 64-bit writes for as long as possible. */
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ptr64 = (void *)ptr;
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for (; count >= 8; count -= 8) {
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*ptr64++ = fill;
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}
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/* Handle the remaining part byte-per-byte. */
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ptr = (void *)ptr64;
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while (count--) {
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*ptr++ = val;
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}
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return dst;
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}
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