diff options
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | bignum.c | 20 |
2 files changed, 19 insertions, 6 deletions
@@ -1,3 +1,8 @@ +Fri Aug 2 12:25:15 2013 Tanaka Akira <akr@fsij.org> + + * bignum.c (bary_mul): Swap x and y for bary_mul1 if x is longer than y. + [ruby-dev:47565] [Bug #8719] Reported by Narihiro Nakamura. + Fri Aug 2 10:39:00 2013 Charlie Somerville <charliesome@ruby-lang.org> * parse.y (negate_lit): add T_RATIONAL and T_COMPLEX to the switch @@ -2559,12 +2559,20 @@ bary_mul_toom3_start(BDIGIT *zds, size_t zl, const BDIGIT *xds, size_t xl, const static void bary_mul(BDIGIT *zds, size_t zl, const BDIGIT *xds, size_t xl, const BDIGIT *yds, size_t yl) { - if (xl < KARATSUBA_MUL_DIGITS || yl < KARATSUBA_MUL_DIGITS) { - if (xds == yds && xl == yl) - bary_sq_fast(zds, zl, xds, xl); - else - bary_mul1(zds, zl, xds, xl, yds, yl); - return; + if (xl <= yl) { + if (yl < KARATSUBA_MUL_DIGITS) { + if (xds == yds && xl == yl) + bary_sq_fast(zds, zl, xds, xl); + else + bary_mul1(zds, zl, xds, xl, yds, yl); + return; + } + } + else { + if (xl < KARATSUBA_MUL_DIGITS) { + bary_mul1(zds, zl, yds, yl, xds, xl); + return; + } } bary_mul_toom3_start(zds, zl, xds, xl, yds, yl, NULL, 0); |