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* string.c (rb_str_times): reduce loop overhead.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@15514 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
akr 2008-02-17 00:18:16 +00:00
parent 71c5e48598
commit 35cb0f807b
3 changed files with 23 additions and 5 deletions
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4
ChangeLog
View file

@ -1,3 +1,7 @@
Sun Feb 17 09:17:08 2008 Tanaka Akira <akr@fsij.org>
* string.c (rb_str_times): reduce loop overhead.
Sun Feb 17 03:37:01 2008 Tanaka Akira <akr@fsij.org>
* include/ruby/re.h (struct rmatch_offset): new struct for character

13
string.c
View file

@ -762,7 +762,7 @@ VALUE
rb_str_times(VALUE str, VALUE times)
{
VALUE str2;
long i, len;
long n, len;
len = NUM2LONG(times);
if (len < 0) {
@ -773,9 +773,14 @@ rb_str_times(VALUE str, VALUE times)
}
str2 = rb_str_new5(str, 0, len *= RSTRING_LEN(str));
for (i = 0; i < len; i += RSTRING_LEN(str)) {
memcpy(RSTRING_PTR(str2) + i,
RSTRING_PTR(str), RSTRING_LEN(str));
if (len) {
n = RSTRING_LEN(str);
memcpy(RSTRING_PTR(str2), RSTRING_PTR(str), n);
while (n <= len/2) {
memcpy(RSTRING_PTR(str2) + n, RSTRING_PTR(str2), n);
n *= 2;
}
memcpy(RSTRING_PTR(str2) + n, RSTRING_PTR(str2), len-n);
}
RSTRING_PTR(str2)[RSTRING_LEN(str2)] = '\0';
OBJ_INFECT(str2, str);

11
test/ruby/test_string.rb
View file

@ -174,7 +174,7 @@ class TestString < Test::Unit::TestCase
s = "a"
10.times {|i|
s << s
assert_equal("a" * (2<<i), s)
assert_equal("a" * (2 << i), s)
}
end
@ -1370,4 +1370,13 @@ class TestString < Test::Unit::TestCase
def test_end_with?
assert("abc".end_with?("c"))
end
def test_times
s1 = ''
100.times {|n|
s2 = "a" * n
assert_equal(s1, s2)
s1 << 'a'
}
end
end