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* random.c (rand_init): use fixed buffer for small numbers.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24034 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2009-07-11 17:24:46 +00:00
parent 3f405a7688
commit 17c1e45405
3 changed files with 38 additions and 33 deletions
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4
ChangeLog
View file

@ -1,3 +1,7 @@
Sun Jul 12 02:24:42 2009 Nobuyoshi Nakada <nobu@ruby-lang.org>
* random.c (rand_init): use fixed buffer for small numbers.
Sat Jul 11 14:43:34 2009 NARUSE, Yui <naruse@ruby-lang.org>
* test/ruby/test_io_m17n.rb (test_strip_bom): added.

63
random.c
View file

@ -223,6 +223,8 @@ rb_genrand_real(void)
return genrand_real(&default_mt.mt);
}
#define roomof(n, m) (int)(((n)+(m)-1) / (m))
#define numberof(array) (int)(sizeof(array) / sizeof((array)[0]))
#define SIZEOF_INT32 (31/CHAR_BIT + 1)
static VALUE
@ -230,49 +232,48 @@ rand_init(struct MT *mt, VALUE vseed)
{
volatile VALUE seed;
long blen = 0;
int len;
unsigned int *buf;
int i, j, len;
unsigned int buf0[SIZEOF_LONG / SIZEOF_INT32 * 4], *buf = buf0;
seed = rb_to_int(vseed);
switch (TYPE(seed)) {
case T_FIXNUM:
len = (int)sizeof(VALUE);
len = 1;
buf[0] = (unsigned int)(FIX2ULONG(seed) & 0xffffffff);
#if SIZEOF_LONG > SIZEOF_INT32
if ((buf[1] = (unsigned int)(FIX2ULONG(seed) >> 32)) != 0) ++len;
#endif
break;
case T_BIGNUM:
blen = RBIGNUM_LEN(seed);
if (blen == 0)
len = 4;
else if (blen > MT_MAX_STATE * SIZEOF_INT32 / SIZEOF_BDIGITS)
if (blen == 0) {
len = 1;
}
else if (blen > MT_MAX_STATE * SIZEOF_INT32 / SIZEOF_BDIGITS) {
blen = (len = MT_MAX_STATE) * SIZEOF_INT32 / SIZEOF_BDIGITS;
else
len = (int)blen * SIZEOF_BDIGITS;
len = roomof(len, SIZEOF_INT32);
}
else {
len = roomof((int)blen * SIZEOF_BDIGITS, SIZEOF_INT32);
}
/* allocate ints for init_by_array */
if (len > numberof(buf0)) buf = ALLOC_N(unsigned int, len);
memset(buf, 0, len * sizeof(*buf));
len = 0;
for (i = (int)(blen-1); 0 <= i; i--) {
j = i * SIZEOF_BDIGITS / SIZEOF_INT32;
#if SIZEOF_BDIGITS < SIZEOF_INT32
buf[j] <<= SIZEOF_BDIGITS * CHAR_BIT;
#endif
buf[j] |= RBIGNUM_DIGITS(seed)[i];
if (!len && buf[j]) len = j;
}
++len;
break;
default:
rb_raise(rb_eTypeError, "failed to convert %s into Integer",
rb_obj_classname(vseed));
}
len = (len + 3) / 4; /* number of 32bit words */
buf = ALLOC_N(unsigned int, len); /* allocate longs for init_by_array */
memset(buf, 0, len * sizeof(int));
if (FIXNUM_P(seed)) {
buf[0] = (unsigned int)(FIX2ULONG(seed) & 0xffffffff);
#if SIZEOF_LONG > 4
buf[1] = (unsigned int)(FIX2ULONG(seed) >> 32);
#endif
}
else {
long i, j;
for (i = blen-1; 0 <= i; i--) {
j = i * SIZEOF_BDIGITS / 4;
#if SIZEOF_BDIGITS < 4
buf[j] <<= SIZEOF_BDIGITS * 8;
#endif
buf[j] |= RBIGNUM_DIGITS(seed)[i];
}
}
while (1 < len && buf[len-1] == 0) {
len--;
}
if (len <= 1) {
init_genrand(mt, buf[0]);
}
@ -281,7 +282,7 @@ rand_init(struct MT *mt, VALUE vseed)
len--;
init_by_array(mt, buf, len);
}
xfree(buf);
if (buf != buf0) xfree(buf);
return seed;
}

4
version.h
View file

@ -1,5 +1,5 @@
#define RUBY_VERSION "1.9.2"
#define RUBY_RELEASE_DATE "2009-07-11"
#define RUBY_RELEASE_DATE "2009-07-12"
#define RUBY_PATCHLEVEL -1
#define RUBY_BRANCH_NAME "trunk"
@ -8,7 +8,7 @@
#define RUBY_VERSION_TEENY 1
#define RUBY_RELEASE_YEAR 2009
#define RUBY_RELEASE_MONTH 7
#define RUBY_RELEASE_DAY 11
#define RUBY_RELEASE_DAY 12
#include "ruby/version.h"