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* bignum.c (rb_big_pow): estimate result bit size more precisely.

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[ruby-core:30735][Feature #3429]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35081 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2012-03-18 08:17:50 +00:00
parent 2555f3f5bf
commit ed4c5f38ba
3 changed files with 12 additions and 3 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Sun Mar 18 17:17:48 2012 Nobuyoshi Nakada <nobu@ruby-lang.org>
* bignum.c (rb_big_pow): estimate result bit size more precisely.
[ruby-core:30735][Feature #3429]
Sun Mar 18 17:17:36 2012 Nobuyoshi Nakada <nobu@ruby-lang.org>
* gc.c (free_method_entry_i): method entry may be in

7
bignum.c
View file

@ -3095,10 +3095,11 @@ rb_big_pow(VALUE x, VALUE y)
else {
VALUE z = 0;
SIGNED_VALUE mask;
const long BIGLEN_LIMIT = 1024*1024 / SIZEOF_BDIGITS;
const long xlen = RBIGNUM_LEN(x) - 1;
const long xbits = ffs(RBIGNUM_DIGITS(x)[xlen]) + SIZEOF_BDIGITS*BITSPERDIG*xlen;
const long BIGLEN_LIMIT = BITSPERDIG*1024*1024;
if ((RBIGNUM_LEN(x) > BIGLEN_LIMIT) ||
(RBIGNUM_LEN(x) > BIGLEN_LIMIT / yy)) {
if ((xbits > BIGLEN_LIMIT) || (xbits * yy > BIGLEN_LIMIT)) {
rb_warn("in a**b, b may be too big");
d = (double)yy;
break;

3
test/ruby/test_bignum.rb
View file

@ -326,6 +326,9 @@ class TestBignum < Test::Unit::TestCase
### rational changes the behavior of Bignum#**
#assert_raise(TypeError) { T32**"foo" }
assert_raise(TypeError, ArgumentError) { T32**"foo" }
feature3429 = '[ruby-core:30735]'
assert_instance_of(Bignum, (2 ** 7830457), feature3429)
end
def test_and