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* re.c (rb_memsearch_ss): performance improvement by using memmem(3) if

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possible. [ruby-dev:45530] [Feature #6311]

* configure.in: check existence of memmem(3) and that it is not broken.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37634 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
glass 2012-11-13 02:12:40 +00:00
parent d24e2d746f
commit c5b19cf01c
3 changed files with 56 additions and 0 deletions
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7
ChangeLog
View file

@ -1,3 +1,10 @@
Tue Nov 13 11:03:47 2012 Masaki Matsushita <glass.saga@gmail.com>
* re.c (rb_memsearch_ss): performance improvement by using memmem(3) if
possible. [ruby-dev:45530] [Feature #6311]
* configure.in: check existence of memmem(3) and that it is not broken.
Tue Nov 13 06:50:02 2012 Aaron Patterson <aaron@tenderlovemaking.com>
* probes.d: add DTrace probe declarations. [ruby-core:27448]

36
configure.in
View file

@ -2900,6 +2900,42 @@ if test "${universal_binary-no}" = yes ; then
])])
fi
AC_CHECK_FUNC(memmem, [
AC_CACHE_CHECK(for broken memmem, rb_cv_broken_memmem, [
AC_TRY_RUN([
#include <string.h>
int
main()
{
char *str = "hogefugafoobar";
char *rs = "foo";
char *empty = "";
char *p;
p = memmem(str, strlen(str), rs, strlen(rs));
if (p == str+8) {
p = memmem(str, strlen(str), empty, strlen(empty));
if (p == str)
return 0;
else
return 1;
}
else {
return 1;
}
}
],
rb_cv_broken_memmem=no,
rb_cv_broken_memmem=yes,
rb_cv_broken_memmem=yes)
])
if test "$rb_cv_broken_memmem" = no; then
AC_DEFINE(HAVE_MEMMEM, 1)
fi
])
CPPFLAGS="$CPPFLAGS "'$(DEFS)'
test -z "$CPPFLAGS" || CPPFLAGS="$CPPFLAGS "; CPPFLAGS="$CPPFLAGS"'${cppflags}'
if test -n "${cflags+set}"; then

13
re.c
View file

@ -97,6 +97,18 @@ rb_memcmp(const void *p1, const void *p2, long len)
return memcmp(p1, p2, len);
}
#ifdef HAVE_MEMMEM
static inline long
rb_memsearch_ss(const unsigned char *xs, long m, const unsigned char *ys, long n)
{
const unsigned char *y;
if (y = memmem(ys, n, xs, m))
return y - ys;
else
return -1;
}
#else
static inline long
rb_memsearch_ss(const unsigned char *xs, long m, const unsigned char *ys, long n)
{
@ -132,6 +144,7 @@ rb_memsearch_ss(const unsigned char *xs, long m, const unsigned char *ys, long n
}
return y - ys - m;
}
#endif
static inline long
rb_memsearch_qs(const unsigned char *xs, long m, const unsigned char *ys, long n)