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>
55 lines
1.3 KiB
C
55 lines
1.3 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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#define CACHE_LINE_SIZE 128
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#include <stddef.h>
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void *memset(void *dest, int c, size_t size);
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void *memset(void *dest, int c, size_t size)
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{
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unsigned char *d = (unsigned char *)dest;
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unsigned long big_c = 0;
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#if defined(__powerpc__) || defined(__powerpc64__)
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if (size > CACHE_LINE_SIZE && c==0) {
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while ((unsigned long long)d % CACHE_LINE_SIZE) {
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*d++ = (unsigned char)c;
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size--;
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}
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while (size >= CACHE_LINE_SIZE) {
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asm volatile ("dcbz 0,%0\n" : : "r"(d) : "memory");
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d+= CACHE_LINE_SIZE;
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size-= CACHE_LINE_SIZE;
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}
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}
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#endif
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if (c) {
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big_c = c;
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big_c |= (big_c << 8) | big_c;
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big_c |= (big_c << 16) | big_c;
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big_c |= (big_c << 32) | big_c;
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}
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while (size >= 8 && c == 0) {
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*((unsigned long *)d) = big_c;
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d+=8;
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size-=8;
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}
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while (size-- > 0) {
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*d++ = (unsigned char)c;
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}
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return dest;
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}
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