mirror of
https://github.com/Dasharo/skiboot.git
synced 2026-03-06 14:50:44 -08:00
Nicholas Piggin
a00971e194
Use compiler builtins for the string functions, and compile the libc/string/ directory with -O2. This reduces instructions booting skiboot in mambo by 2.9 million in slow-sim mode, or 3.8 in normal mode, for less than 1kB image size increase. This can result in the compiler warning more cases of string function problems. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
37 lines
1.0 KiB
C
37 lines
1.0 KiB
C
/******************************************************************************
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* Copyright (c) 2004, 2008 IBM Corporation
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* All rights reserved.
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* This program and the accompanying materials
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* are made available under the terms of the BSD License
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* which accompanies this distribution, and is available at
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* http://www.opensource.org/licenses/bsd-license.php
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*
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* Contributors:
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* IBM Corporation - initial implementation
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*****************************************************************************/
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#include <stddef.h>
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void *memcpy(void *dest, const void *src, size_t n);
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void *memmove(void *dest, const void *src, size_t n);
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void *memmove(void *dest, const void *src, size_t n)
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{
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/* Do the buffers overlap in a bad way? */
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if (src < dest && src + n >= dest) {
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char *cdest;
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const char *csrc;
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int i;
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/* Copy from end to start */
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cdest = dest + n - 1;
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csrc = src + n - 1;
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for (i = 0; i < n; i++) {
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*cdest-- = *csrc--;
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}
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return dest;
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} else {
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/* Normal copy is possible */
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return memcpy(dest, src, n);
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}
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}
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