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author | Chris Metcalf <cmetcalf@tilera.com> | 2012-11-02 12:53:57 -0400 |
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committer | Chris Metcalf <cmetcalf@tilera.com> | 2012-11-06 09:24:19 -0500 |
commit | cd84016efe83d92ee3903fef37f79ca2bafb3985 (patch) | |
tree | 7a92df4a9a081a6f20b8fd68f31139b6336e595c /ports/sysdeps/tile/memcopy.h | |
parent | 82477c28f46c579a149a8333c07233e9f4e43408 (diff) | |
download | glibc-cd84016efe83d92ee3903fef37f79ca2bafb3985.zip glibc-cd84016efe83d92ee3903fef37f79ca2bafb3985.tar.gz glibc-cd84016efe83d92ee3903fef37f79ca2bafb3985.tar.bz2 |
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.
Diffstat (limited to 'ports/sysdeps/tile/memcopy.h')
-rw-r--r-- | ports/sysdeps/tile/memcopy.h | 27 |
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 0000000..2bc3fce --- /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 |