Optimize tile (mostly tilegx) memcpy and memmove performance.

- Override <memcopy.h> so we use full 8-byte word copies on tilegx32
  for memmove, then use op_t in memcpy instead of the previous
  locally-defined word_t just to avoid proliferating identical types.
- Fix bug in memcpy prefetch that caused us to never prefetch past
  the first cache line.
- Optimize misaligned memcpy by inlining _wordcopy_fwd_dest_aligned
  instead of just doing a dumb word-at-a-time copy.
- Make memcpy safe for forward copies by doing all the loads from
  a given cache line prior to doing a wh64 (cache line zero-fill)
  on the destination.  Remove now-redundant src == dst check.
- Copy and optimize the generic wordcopy.c routines to use the tile
  "double align" instruction instead of the MERGE macro; to avoid
  offset addressing mode (which tile doesn't have) by rewriting the
  pointer math to load and store with a zero index; and to use
  post-increment addresses in the inner loops to improve scheduling.

1 files changed, 27 insertions, 0 deletions

diff --git a/ports/sysdeps/tile/memcopy.h b/ports/sysdeps/tile/memcopy.h
new file mode 100644
index 0000000000..2bc3fce686
--- /dev/null
+++ b/ports/sysdeps/tile/memcopy.h
@@ -0,0 +1,27 @@
+/* memcopy.h -- definitions for memory copy functions.  Tile version.
+   Copyright (C) 2012 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 <sysdeps/generic/memcopy.h>
+#include <bits/wordsize.h>
+
+/* Support more efficient copying on tilegx32, which supports
+   long long as a native 64-bit type.  */
+#if defined (__tilegx__) && __WORDSIZE == 32
+# undef op_t
+# define op_t	unsigned long long int
+#endif