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Diffstat (limited to 'arch/tile/lib/memset_64.c')
-rw-r--r--arch/tile/lib/memset_64.c142
1 files changed, 0 insertions, 142 deletions
diff --git a/arch/tile/lib/memset_64.c b/arch/tile/lib/memset_64.c
deleted file mode 100644
index 03ef69cd73de..000000000000
--- a/arch/tile/lib/memset_64.c
+++ /dev/null
@@ -1,142 +0,0 @@
-/*
- * Copyright 2011 Tilera Corporation. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * 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, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for
- * more details.
- */
-
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/module.h>
-#include <arch/chip.h>
-#include "string-endian.h"
-
-void *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;
-}
-EXPORT_SYMBOL(memset);