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* bignum.c (big2str_struct): New structure.

Browse source 
(big2str_orig): Use big2str_struct.
  (big2str_karatsuba): Ditto.
  (rb_big2str1): Ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42262 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
akr 2013-07-31 03:20:35 +00:00
parent 7e46533618
commit 6189859101
2 changed files with 33 additions and 20 deletions
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7
ChangeLog
View file

@ -1,3 +1,10 @@
Wed Jul 31 12:18:47 2013 Tanaka Akira <akr@fsij.org>
* bignum.c (big2str_struct): New structure.
(big2str_orig): Use big2str_struct.
(big2str_karatsuba): Ditto.
(rb_big2str1): Ditto.
Wed Jul 31 12:02:16 2013 Zachary Scott <e@zzak.io>
* lib/rubygems.rb: [DOC] typo in url patch by @Red54 [Fixes #369]

46
bignum.c
View file

@ -4186,8 +4186,14 @@ big2str_find_n1(VALUE x, int base)
return (long)ceil(((double)bits)/log_2[base - 2]);
}
struct big2str_struct {
int base;
BDIGIT hbase;
int hbase_numdigits;
};
static long
big2str_orig(VALUE x, int base, char* ptr, long len, BDIGIT hbase, int hbase_numdigits, int trim)
big2str_orig(struct big2str_struct *b2s, VALUE x, char* ptr, long len, int trim)
{
long i = RBIGNUM_LEN(x), j = len;
BDIGIT* ds = BDIGITS(x);
@ -4198,14 +4204,14 @@ big2str_orig(VALUE x, int base, char* ptr, long len, BDIGIT hbase, int hbase_num
while (k--) { /* x / hbase */
num = BIGUP(num) + ds[k];
ds[k] = (BDIGIT)(num / hbase);
num %= hbase;
ds[k] = (BDIGIT)(num / b2s->hbase);
num %= b2s->hbase;
}
if (trim && ds[i-1] == 0) i--;
k = hbase_numdigits;
k = b2s->hbase_numdigits;
while (k--) {
ptr[--j] = ruby_digitmap[num % base];
num /= base;
ptr[--j] = ruby_digitmap[num % b2s->base];
num /= b2s->base;
if (j <= 0) break;
if (trim && i == 0 && num == 0) break;
}
@ -4219,8 +4225,8 @@ big2str_orig(VALUE x, int base, char* ptr, long len, BDIGIT hbase, int hbase_num
}
static long
big2str_karatsuba(VALUE x, int base, char* ptr,
long n1, long len, BDIGIT hbase, int hbase_numdigits, int trim)
big2str_karatsuba(struct big2str_struct *b2s, VALUE x, char* ptr,
long n1, long len, int trim)
{
long lh, ll, m1;
VALUE b, q, r;
@ -4234,18 +4240,18 @@ big2str_karatsuba(VALUE x, int base, char* ptr,
}
if (n1 <= KARATSUBA_BIG2STR_DIGITS) {
return big2str_orig(x, base, ptr, len, hbase, hbase_numdigits, trim);
return big2str_orig(b2s, x, ptr, len, trim);
}
b = power_cache_get_power(base, n1, &m1);
b = power_cache_get_power(b2s->base, n1, &m1);
bigdivmod(x, b, &q, &r);
rb_obj_hide(q);
rb_obj_hide(r);
lh = big2str_karatsuba(q, base, ptr, (len - m1)/2,
len - m1, hbase, hbase_numdigits, trim);
lh = big2str_karatsuba(b2s, q, ptr, (len - m1)/2,
len - m1, trim);
rb_big_resize(q, 0);
ll = big2str_karatsuba(r, base, ptr + lh, m1/2,
m1, hbase, hbase_numdigits, !lh && trim);
ll = big2str_karatsuba(b2s, r, ptr + lh, m1/2,
m1, !lh && trim);
rb_big_resize(r, 0);
return lh + ll;
@ -4288,9 +4294,8 @@ rb_big2str1(VALUE x, int base, int trim)
int off;
VALUE ss, xx;
long n1, n2, len;
BDIGIT hbase;
int hbase_numdigits;
char* ptr;
struct big2str_struct b2s_data;
if (FIXNUM_P(x)) {
return rb_fix2str(x, base);
@ -4314,16 +4319,17 @@ rb_big2str1(VALUE x, int base, int trim)
ptr = RSTRING_PTR(ss);
ptr[0] = RBIGNUM_SIGN(x) ? '+' : '-';
hbase = maxpow_in_bdigit(base, &hbase_numdigits);
b2s_data.base = base;
b2s_data.hbase = maxpow_in_bdigit(base, &b2s_data.hbase_numdigits);
off = !(trim && RBIGNUM_SIGN(x)); /* erase plus sign if trim */
xx = rb_big_clone(x);
RBIGNUM_SET_SIGN(xx, 1);
if (n1 <= KARATSUBA_BIG2STR_DIGITS) {
len = off + big2str_orig(xx, base, ptr + off, n2, hbase, hbase_numdigits, trim);
len = off + big2str_orig(&b2s_data, xx, ptr + off, n2, trim);
}
else {
len = off + big2str_karatsuba(xx, base, ptr + off, n1,
n2, hbase, hbase_numdigits, trim);
len = off + big2str_karatsuba(&b2s_data, xx, ptr + off, n1,
n2, trim);
}
rb_big_resize(xx, 0);