diff options
Diffstat (limited to 'libc/string/powerpc/string.c')
| -rw-r--r-- | libc/string/powerpc/string.c | 213 |
1 files changed, 0 insertions, 213 deletions
diff --git a/libc/string/powerpc/string.c b/libc/string/powerpc/string.c deleted file mode 100644 index d02deda08..000000000 --- a/libc/string/powerpc/string.c +++ /dev/null @@ -1,213 +0,0 @@ -/* - * This program is free software; you can redistribute it and/or modify it under - * the terms of the GNU Library General Public License as published by the Free - * Software Foundation; either version 2 of the License, or (at your option) any - * later version. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS - * FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more - * details. - */ - -/* These are carefully optimized mem*() functions for PPC written in C. - * Don't muck around with these function without checking the generated - * assmbler code. - * It is possible to optimize these significantly more by using specific - * data cache instructions(mainly dcbz). However that requires knownledge - * about the CPU's cache line size. - * - * BUG ALERT! - * The cache instructions on MPC8xx CPU's are buggy(they don't update - * the DAR register when causing a DTLB Miss/Error) and cannot be - * used on 8xx CPU's without a kernel patch to work around this - * problem. - * - * Copyright (C) 2004 Joakim Tjernlund - */ - -#define _GNU_SOURCE -#include <string.h> -#include <locale.h> /* for __LOCALE_C_ONLY */ - -#ifdef L_memcpy -void attribute_hidden *__memcpy(void *to, const void *from, size_t n) -/* PPC can do pre increment and load/store, but not post increment and load/store. - Therefore use *++ptr instead of *ptr++. */ -{ - unsigned long rem, chunks, tmp1, tmp2; - unsigned char *tmp_to; - unsigned char *tmp_from = (unsigned char *)from; - - chunks = n / 8; - tmp_from -= 4; - tmp_to = to - 4; - if (!chunks) - goto lessthan8; - rem = (unsigned long )tmp_to % 4; - if (rem) - goto align; - copy_chunks: - do { - /* make gcc to load all data, then store it */ - tmp1 = *(unsigned long *)(tmp_from+4); - tmp_from += 8; - tmp2 = *(unsigned long *)tmp_from; - *(unsigned long *)(tmp_to+4) = tmp1; - tmp_to += 8; - *(unsigned long *)tmp_to = tmp2; - } while (--chunks); - lessthan8: - n = n % 8; - if (n >= 4) { - *(unsigned long *)(tmp_to+4) = *(unsigned long *)(tmp_from+4); - tmp_from += 4; - tmp_to += 4; - n = n-4; - } - if (!n ) return to; - tmp_from += 3; - tmp_to += 3; - do { - *++tmp_to = *++tmp_from; - } while (--n); - - return to; - align: - rem = 4 - rem; - n = n - rem; - do { - *(tmp_to+4) = *(tmp_from+4); - ++tmp_from; - ++tmp_to; - } while (--rem); - chunks = n / 8; - if (chunks) - goto copy_chunks; - goto lessthan8; -} -strong_alias(__memcpy, memcpy); -#endif - -#ifdef L_memmove -void attribute_hidden *__memmove(void *to, const void *from, size_t n) -{ - unsigned long rem, chunks, tmp1, tmp2; - unsigned char *tmp_to; - unsigned char *tmp_from = (unsigned char *)from; - - if (tmp_from >= (unsigned char *)to) - return memcpy(to, from, n); - chunks = n / 8; - tmp_from += n; - tmp_to = to + n; - if (!chunks) - goto lessthan8; - rem = (unsigned long )tmp_to % 4; - if (rem) - goto align; - copy_chunks: - do { - /* make gcc to load all data, then store it */ - tmp1 = *(unsigned long *)(tmp_from-4); - tmp_from -= 8; - tmp2 = *(unsigned long *)tmp_from; - *(unsigned long *)(tmp_to-4) = tmp1; - tmp_to -= 8; - *(unsigned long *)tmp_to = tmp2; - } while (--chunks); - lessthan8: - n = n % 8; - if (n >= 4) { - *(unsigned long *)(tmp_to-4) = *(unsigned long *)(tmp_from-4); - tmp_from -= 4; - tmp_to -= 4; - n = n-4; - } - if (!n ) return to; - do { - *--tmp_to = *--tmp_from; - } while (--n); - - return to; - align: - rem = 4 - rem; - n = n - rem; - do { - *--tmp_to = *--tmp_from; - } while (--rem); - chunks = n / 8; - if (chunks) - goto copy_chunks; - goto lessthan8; -} -strong_alias(__memmove, memmove); -#endif - -#ifdef L_memset -static inline int expand_byte_word(int c){ - /* this does: - c = c << 8 | c; - c = c << 16 | c ; - */ - asm("rlwimi %0,%0,8,16,23\n" - "\trlwimi %0,%0,16,0,15\n" - : "=r" (c) : "0" (c)); - return c; -} -void attribute_hidden *__memset(void *to, int c, size_t n) -{ - unsigned long rem, chunks; - unsigned char *tmp_to; - - chunks = n / 8; - tmp_to = to - 4; - c = expand_byte_word(c); - if (!chunks) - goto lessthan8; - rem = (unsigned long )tmp_to % 4; - if (rem) - goto align; - copy_chunks: - do { - *(unsigned long *)(tmp_to+4) = c; - tmp_to += 4; - *(unsigned long *)(tmp_to+4) = c; - tmp_to += 4; - } while (--chunks); - lessthan8: - n = n % 8; - if (n >= 4) { - *(unsigned long *)(tmp_to+4) = c; - tmp_to += 4; - n = n-4; - } - if (!n ) return to; - tmp_to += 3; - do { - *++tmp_to = c; - } while (--n); - - return to; - align: - rem = 4 - rem; - n = n-rem; - do { - *(tmp_to+4) = c; - ++tmp_to; - } while (--rem); - chunks = n / 8; - if (chunks) - goto copy_chunks; - goto lessthan8; -} -strong_alias(__memset, memset); -#endif - -#ifdef L_bzero -weak_alias(__bzero,bzero); -void __bzero(void *s, size_t n) -{ - (void)memset(s, 0, n); -} -#endif |