1 files changed, 151 insertions, 0 deletions
diff --git a/sysdeps/tile/tilepro/memset.c b/sysdeps/tile/tilepro/memset.c
new file mode 100644
index 0000000000..85d6b810ed
--- /dev/null
+++ b/sysdeps/tile/tilepro/memset.c
@@ -0,0 +1,151 @@
+/* Copyright (C) 2011-2014 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 <string.h>
+#include <stdint.h>
+#include <arch/chip.h>
+
+void *
+__memset (void *s, int c, size_t n)
+{
+  uint32_t *out32;
+  int n32;
+  uint32_t v16, v32;
+  uint8_t *out8 = s;
+  int to_align32;
+
+  /* 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 < 3
+  /* 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 >= 3 so this won't write past the end. */
+  while (((uintptr_t) out8 & 3) != 0)
+    {
+      *out8++ = c;
+      --n;
+    }
+
+  /* Align 'n'. */
+  while (n & 3)
+    out8[--n] = c;
+
+  out32 = (uint32_t *) out8;
+  n32 = n >> 2;
+
+  /* Tile input byte out to 32 bits. */
+  v16 = __insn_intlb (c, c);
+  v32 = __insn_intlh (v16, v16);
+
+  /* This must be at least 8 or the following loop doesn't work. */
+#define CACHE_LINE_SIZE_IN_WORDS (CHIP_L2_LINE_SIZE() / 4)
+
+  /* Determine how many words we need to emit before the 'out32'
+     pointer becomes aligned modulo the cache line size.  */
+  to_align32 = (-((uintptr_t) out32 >> 2)) & (CACHE_LINE_SIZE_IN_WORDS - 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_align32 <= n32 - CACHE_LINE_SIZE_IN_WORDS)
+    {
+      int lines_left;
+
+      /* Align out32 mod the cache line size so we can use wh64. */
+      n32 -= to_align32;
+      for (; to_align32 != 0; to_align32--)
+        {
+          *out32 = v32;
+          out32++;
+        }
+
+      /* Use unsigned divide to turn this into a right shift. */
+      lines_left = (unsigned) n32 / CACHE_LINE_SIZE_IN_WORDS;
+
+      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 ());
+          uint32_t *wh = out32;
+          int i = x;
+          int j;
+
+          lines_left -= x;
+
+          do
+            {
+              __insn_wh64 (wh);
+              wh += CACHE_LINE_SIZE_IN_WORDS;
+            }
+          while (--i);
+
+          for (j = x * (CACHE_LINE_SIZE_IN_WORDS / 4); j != 0; j--)
+            {
+              *out32++ = v32;
+              *out32++ = v32;
+              *out32++ = v32;
+              *out32++ = v32;
+            }
+        }
+      while (lines_left != 0);
+
+      /* We processed all full lines above, so only this many words
+         remain to be processed.  */
+      n32 &= CACHE_LINE_SIZE_IN_WORDS - 1;
+    }
+
+  /* Now handle any leftover values. */
+  if (n32 != 0)
+    {
+      do
+        {
+          *out32 = v32;
+          out32++;
+        }
+      while (--n32 != 0);
+    }
+
+  return s;
+}
+weak_alias (__memset, memset)
+libc_hidden_builtin_def (memset)