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| author | Paul Eggert <eggert@cs.ucla.edu> | 2013-08-22 15:45:56 -0700 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2013-08-22 15:46:27 -0700 |
| commit | 59f4ef95f8a9c0583d1560ef447eab9d44e32cd1 (patch) | |
| tree | 72b3e6d5a7e41b86ea28731c558a5ad506277ec9 /bootstrap.conf | |
| parent | 9350980d5dd0d922845bcbb225207a775cf40697 (diff) | |
| download | diffutils-59f4ef95f8a9c0583d1560ef447eab9d44e32cd1.tar.gz | |
cmp, diff, sdiff: tune by using rawmemchr
On my platform (AMD Phenom II X4 910e, Fedora 17 x86-64), this sped up
'cmp -n 8GiB /dev/full /dev/zero' by a factor of 3.8, and
'cmp -sn 8GiB /dev/full /dev/zero' by a factor of 1.8.
* bootstrap.conf (gnulib_modules): Add rawmemchr.
* src/cmp.c (cmp): Optimize the common case where buffers are the same,
by using count_newlines rather than block_compare_and_count.
(block_compare_and_count): Remove.
(count_newlines): New function.
* src/cmp.c (count_newlines):
* src/io.c (prepare_text):
* src/sdiff.c (lf_copy, lf_skip, lf_snarf):
Use rawmemchr instead of memchr, for speed.
Diffstat (limited to 'bootstrap.conf')
| -rw-r--r-- | bootstrap.conf | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/bootstrap.conf b/bootstrap.conf index 240754b..ac85adf 100644 --- a/bootstrap.conf +++ b/bootstrap.conf @@ -56,6 +56,7 @@ mkstemp mktime progname propername +rawmemchr readme-release regex sh-quote |