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Apply performance improvement to short byte array search.

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* re.c (rb_memsearch_ss): Apply performance improvement to short
  byte array search for platforms without memmem(3).
  [Feature #6311] [ruby-dev:45530]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37793 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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knu 2012-11-22 05:23:12 +00:00
parent 9cbaeed6ed
commit 61e21e82ad
3 changed files with 16 additions and 0 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
Thu Nov 22 14:14:36 2012 Akinori MUSHA <knu@iDaemons.org>
* re.c (rb_memsearch_ss): Apply performance improvement to short
byte array search for platforms without memmem(3).
[Feature #6311] [ruby-dev:45530]
Thu Nov 22 12:52:19 2012 Akinori MUSHA <knu@iDaemons.org>
* test/ruby/test_string.rb (TestString#test_index): Add some

3
re.c
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@ -126,6 +126,9 @@ rb_memsearch_ss(const unsigned char *xs, long m, const unsigned char *ys, long n
if (m > SIZEOF_VALUE)
rb_bug("!!too long pattern string!!");
if (!(y = memchr(y, *x, n - m + 1)))
return -1;
/* Prepare hash value */
for (hx = *x++, hy = *y++; x < xe; ++x, ++y) {
hx <<= CHAR_BIT;

7
test/ruby/test_string.rb
View file

@ -837,6 +837,13 @@ class TestString < Test::Unit::TestCase
assert_equal(0, S("hello").index(S("")))
assert_equal(0, S("hello").index(//))
s = S("long") * 1000 << "x"
assert_nil(s.index(S("y")))
assert_equal(4 * 1000, s.index(S("x")))
s << "yx"
assert_equal(4 * 1000, s.index(S("x")))
assert_equal(4 * 1000, s.index(S("xyx")))
o = Object.new
def o.to_str; "bar"; end
assert_equal(3, "foobarbarbaz".index(o))