diff options
Diffstat (limited to 'sysdeps/tile/tilegx/memset.c')
| -rw-r--r-- | sysdeps/tile/tilegx/memset.c | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/sysdeps/tile/tilegx/memset.c b/sysdeps/tile/tilegx/memset.c deleted file mode 100644 index b27c5f3fb9..0000000000 --- a/sysdeps/tile/tilegx/memset.c +++ /dev/null @@ -1,151 +0,0 @@ -/* Copyright (C) 2011-2016 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library. If not, see - <http://www.gnu.org/licenses/>. */ - -#include <arch/chip.h> -#include <string.h> -#include <stdint.h> -#include "string-endian.h" - -void * inhibit_loop_to_libcall -__memset (void *s, int c, size_t n) -{ - uint64_t *out64; - int n64, to_align64; - uint64_t v64; - uint8_t *out8 = s; - - /* Experimentation shows that a trivial tight loop is a win up until - around a size of 20, where writing a word at a time starts to win. */ -#define BYTE_CUTOFF 20 - -#if BYTE_CUTOFF < 7 - /* This must be at least at least this big, or some code later - on doesn't work. */ -# error "BYTE_CUTOFF is too small." -#endif - - if (n < BYTE_CUTOFF) - { - /* Strangely, this turns out to be the tightest way to write - this loop. */ - if (n != 0) - { - do - { - /* Strangely, combining these into one line performs worse. */ - *out8 = c; - out8++; - } - while (--n != 0); - } - - return s; - } - - /* Align 'out8'. We know n >= 7 so this won't write past the end. */ - while (((uintptr_t) out8 & 7) != 0) - { - *out8++ = c; - --n; - } - - /* Align 'n'. */ - while (n & 7) - out8[--n] = c; - - out64 = (uint64_t *) out8; - n64 = n >> 3; - - /* Tile input byte out to 64 bits. */ - v64 = copy_byte(c); - - /* This must be at least 8 or the following loop doesn't work. */ -#define CACHE_LINE_SIZE_IN_DOUBLEWORDS (CHIP_L2_LINE_SIZE() / 8) - - /* Determine how many words we need to emit before the 'out32' - pointer becomes aligned modulo the cache line size. */ - to_align64 = (-((uintptr_t) out64 >> 3)) & - (CACHE_LINE_SIZE_IN_DOUBLEWORDS - 1); - - /* Only bother aligning and using wh64 if there is at least - one full cache line to process. This check also prevents - overrunning the end of the buffer with alignment words. */ - if (to_align64 <= n64 - CACHE_LINE_SIZE_IN_DOUBLEWORDS) - { - int lines_left; - - /* Align out64 mod the cache line size so we can use wh64. */ - n64 -= to_align64; - for (; to_align64 != 0; to_align64--) - { - *out64 = v64; - out64++; - } - - /* Use unsigned divide to turn this into a right shift. */ - lines_left = (unsigned) n64 / CACHE_LINE_SIZE_IN_DOUBLEWORDS; - - do - { - /* Only wh64 a few lines at a time, so we don't exceed the - maximum number of victim lines. */ - int x = ((lines_left < CHIP_MAX_OUTSTANDING_VICTIMS ()) ? lines_left - : CHIP_MAX_OUTSTANDING_VICTIMS ()); - uint64_t *wh = out64; - int i = x; - int j; - - lines_left -= x; - - do - { - __insn_wh64 (wh); - wh += CACHE_LINE_SIZE_IN_DOUBLEWORDS; - } - while (--i); - - for (j = x * (CACHE_LINE_SIZE_IN_DOUBLEWORDS / 4); j != 0; j--) - { - *out64++ = v64; - *out64++ = v64; - *out64++ = v64; - *out64++ = v64; - } - } - while (lines_left != 0); - - /* We processed all full lines above, so only this many - words remain to be processed. */ - n64 &= CACHE_LINE_SIZE_IN_DOUBLEWORDS - 1; - } - - /* Now handle any leftover values. */ - if (n64 != 0) - { - do - { - *out64 = v64; - out64++; - } - while (--n64 != 0); - } - - return s; -} -weak_alias (__memset, memset) -libc_hidden_builtin_def (memset) |