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* bignum.c (bigmul1_karatsuba): avoid overflow that make assertion 

fail in certain case.  this patch is contributed from Ray Chason
  <chasonr at gmail.com> in personal communication.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30483 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
matz 2011-01-07 00:17:06 +00:00
parent b215d61d9f
commit dc06b7b715
2 changed files with 12 additions and 6 deletions
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6
ChangeLog
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@ -2,6 +2,12 @@ Fri Jan 7 00:37:35 2011 Tanaka Akira <akr@fsij.org>
* string.c: parenthesize macro arguments.
Thu Jan 6 22:42:02 2011 Yukihiro Matsumoto <matz@ruby-lang.org>
* bignum.c (bigmul1_karatsuba): avoid overflow that make assertion
fail in certain case. this patch is contributed from Ray Chason
<chasonr at gmail.com> in personal communication.
Thu Jan 6 20:55:49 2011 NAKAMURA Usaku <usa@ruby-lang.org>
* lib/mkmf.rb (create_makefile): ignore rest from first dot from

12
bignum.c
View File

@ -2157,15 +2157,15 @@ bigmul1_karatsuba(VALUE x, VALUE y)
t3 = bigmul0(xh, yh);
i = xn + yn - n;
/* subtract t1 from t3 */
bigsub_core(BDIGITS(t3), big_real_len(t3), BDIGITS(t1), t1n, BDIGITS(t3), big_real_len(t3));
/* subtract t2 from t3; t3 is now the middle term of the product */
if (t2 != Qundef) bigsub_core(BDIGITS(t3), big_real_len(t3), BDIGITS(t2), t2n, BDIGITS(t3), big_real_len(t3));
/* add t3 to middle bytes of the result (z1) */
bigadd_core(zds + n, i, BDIGITS(t3), big_real_len(t3), zds + n, i);
/* subtract t1 from middle bytes of the result (z1) */
bigsub_core(zds + n, i, BDIGITS(t1), t1n, zds + n, i);
/* subtract t2 from middle bytes of the result (z1) */
if (t2 != Qundef) bigsub_core(zds + n, i, BDIGITS(t2), t2n, zds + n, i);
return z;
}