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merge revision(s) 37567: [Backport #7315]

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* bignum.c (bigmul0): enable big_mul_toom3.
	  [ruby-core:48552] [Bug #7242]

	* bignum.c (bigmul1_toom3): fix incorrect calculation.
	  the patch is made by Heesob Park.
	  [ruby-core:48552] [Bug #7242]

	* bignum.c (bigmul0): disable big_mul_toom3 temporalily.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@37573 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
usa 2012-11-09 04:16:27 +00:00
parent 122b6dbcb7
commit 995e42817c
4 changed files with 21 additions and 8 deletions
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13
ChangeLog
View file

@ -1,6 +1,15 @@
Thu Nov 9 05:33:99 2012 Kenta Murata <mrkn@mrkn.jp>
Fri Nov 9 13:16:16 2012 Kenta Murata <mrkn@mrkn.jp>
* bignum.c (bigmul0): disable big_mul_toom3_temporalily.
* bignum.c (bigmul0): enable big_mul_toom3.
[ruby-core:48552] [Bug #7242]
* bignum.c (bigmul1_toom3): fix incorrect calculation.
the patch is made by Heesob Park.
[ruby-core:48552] [Bug #7242]
Fri Nov 9 13:16:16 2012 Kenta Murata <mrkn@mrkn.jp>
* bignum.c (bigmul0): disable big_mul_toom3 temporalily.
[ruby-core:48552] [Bug #7242]
* test/ruby/test_bignum.rb (test_mul_large_numbers):

7
bignum.c
View file

@ -2419,7 +2419,7 @@ bigmul1_toom3(VALUE x, VALUE y)
z2 = bigtrunc(bigadd(u2, u0, 0));
/* z3 <- (z2 - z3) / 2 + 2 * z(inf) == (z2 - z3) / 2 + 2 * u4 */
z3 = bigadd(z2, z3, 0);
z3 = bigtrunc(bigadd(z2, z3, 0));
bigrsh_bang(BDIGITS(z3), RBIGNUM_LEN(z3), 1);
t = big_lshift(u4, 1); /* TODO: combining with next addition */
z3 = bigtrunc(bigadd(z3, t, 1));
@ -2535,8 +2535,13 @@ bigmul0(VALUE x, VALUE y)
/* balance multiplication by slicing y when x is much smaller than y */
if (2 * xn <= yn) return bigmul1_balance(x, y);
if (xn < TOOM3_MUL_DIGITS) {
/* multiplication by karatsuba method */
return bigmul1_karatsuba(x, y);
}
else if (3*xn <= 2*(yn + 2))
return bigmul1_balance(x, y);
return bigmul1_toom3(x, y);
}
/*

3
test/ruby/test_bignum.rb
View file

@ -274,7 +274,6 @@ class TestBignum < Test::Unit::TestCase
69131640408147806442422254638590386673344704147156793990832671592488742473
31524606724894164324227362735271650556732855509929890983919463699819116427
].join.to_i
b = %w[
31519454770031243652776765515030872050264386564379909299874378289835540661
99756262835346828114038365624177182230027040172583473561802565238817167503
@ -354,7 +353,7 @@ class TestBignum < Test::Unit::TestCase
21851731257845562153822058534043916834839514338448582518847879059020959697
90538105704766415685100946308842788321400392381169436435078204622400475281
].join.to_i
assert_equal(c, a*b)
assert_equal(c, a*b, '[ruby-core:48552]')
end
def test_divrem

2
version.h
View file

@ -1,5 +1,5 @@
#define RUBY_VERSION "1.9.3"
#define RUBY_PATCHLEVEL 319
#define RUBY_PATCHLEVEL 320
#define RUBY_RELEASE_DATE "2012-11-09"
#define RUBY_RELEASE_YEAR 2012