174 lines
4.0 KiB
C
174 lines
4.0 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)memset.c 5.6 (Berkeley) 1/26/91";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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#include <string.h>
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#ifdef __PPC__
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/* Relatively fast memset for PPC. - Piru */
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#undef USE_INDEX
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#undef USE_WRITE64
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#define USE_INDEX 1
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#define USE_WRITE64 0
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void *memset(void *b, int c, size_t len)
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{
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typedef unsigned char u8;
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typedef unsigned int u32;
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#if USE_WRITE64
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typedef double LTYPE;
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#else
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typedef unsigned int LTYPE;
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#endif
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const size_t LSIZE = sizeof(LTYPE);
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const size_t LMASK = sizeof(LTYPE) - 1;
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void *dst = b;
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#if 0
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if ((u8) c == 0)
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{
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bzero(b, len);
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return dst;
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}
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#endif
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if (len > LSIZE * 4)
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{
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LTYPE fc;
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size_t n, o;
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#if USE_WRITE64
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u32 ft, *fcp = (u32 *) &fc;
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ft = (u8) c;
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ft |= (ft << 24) | (ft << 16) | (ft << 8);
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fcp[0] = ft; fcp[1] = ft;
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#else
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fc = (u8) c;
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fc |= (fc << 24) | (fc << 16) | (fc << 8);
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#endif
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n = (size_t)b & LMASK;
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if (n)
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{
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len -= n;
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do
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*((u8 *)b)++ = c;
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while (--n);
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}
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n = len / LSIZE;
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len &= LMASK;
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if (n >= 8)
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{
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o = n / 8;
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n &= 7;
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#if USE_INDEX
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do
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{
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((LTYPE *)b)[0] = fc;
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((LTYPE *)b)[1] = fc;
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((LTYPE *)b)[2] = fc;
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((LTYPE *)b)[3] = fc;
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((LTYPE *)b)[4] = fc;
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((LTYPE *)b)[5] = fc;
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((LTYPE *)b)[6] = fc;
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((LTYPE *)b) += 8;
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((LTYPE *)b)[-1] = fc;
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} while (--o);
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#else
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((LTYPE *)b)--;
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do
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{
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*++((LTYPE *)b) = fc;
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*++((LTYPE *)b) = fc;
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*++((LTYPE *)b) = fc;
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*++((LTYPE *)b) = fc;
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*++((LTYPE *)b) = fc;
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*++((LTYPE *)b) = fc;
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*++((LTYPE *)b) = fc;
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*++((LTYPE *)b) = fc;
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} while (--o);
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((LTYPE *)b)++;
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#endif
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}
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while (n--)
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*((LTYPE *)b)++ = fc;
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}
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while (len--)
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*((u8 *)b)++ = c;
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return dst;
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}
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#else
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void *
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memset(dst, c, n)
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void *dst;
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register int c;
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register size_t n;
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{
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if (n != 0) {
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register char *d = dst;
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do
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*d++ = c;
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while (--n != 0);
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}
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return (dst);
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}
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#endif
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