diff options
author | matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2007-07-13 16:46:39 +0000 |
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committer | matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2007-07-13 16:46:39 +0000 |
commit | 356d61050c95af7b25fc844ad2125cc3eced4f06 (patch) | |
tree | 3593cec254ba0da56c19f575c27608159eef728f /numeric.c | |
parent | bef2f087b6a456c5cc7facdba933e5cf9dba436e (diff) |
* numeric.c (int_pow): wrong overflow detection. [ruby-dev:31213]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@12774 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'numeric.c')
-rw-r--r-- | numeric.c | 8 |
1 files changed, 5 insertions, 3 deletions
@@ -2197,16 +2197,18 @@ int_pow(x, y) while (y % 2 == 0) { long x2 = x * x; if (x2 < x || !POSFIXABLE(x2)) { + VALUE v; bignum: - return rb_big_mul(rb_big_pow(rb_int2big(x), LONG2NUM(y)), - rb_int2big(neg ? -z : z)); + v = rb_big_pow(rb_int2big(x), LONG2NUM(y)); + if (z != 1) v = rb_big_mul(rb_int2big(neg ? -z : z), v); + return v; } x = x2; y >>= 1; } { long xz = x * z; - if (xz < z || xz < x || !POSFIXABLE(xz)) { + if (!POSFIXABLE(xz) || xz / x != z) { goto bignum; } z = xz; |