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* bignum.c (rb_big_pow): Retry if y is a Bignum and it is

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representable as a Fixnum.
  Use rb_absint_numwords.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41667 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
akr 2013-06-26 15:27:20 +00:00
parent 186b494a81
commit c72186f4c2
2 changed files with 15 additions and 4 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
Thu Jun 27 00:23:57 2013 Tanaka Akira <akr@fsij.org>
* bignum.c (rb_big_pow): Retry if y is a Bignum and it is
representable as a Fixnum.
Use rb_absint_numwords.
Wed Jun 26 23:53:00 2013 Charlie Somerville <charliesome@ruby-lang.org>
* ext/bigdecimal/bigdecimal.c (BigDecimal_save_rounding_mode): fix typo.

13
bignum.c
View file

@ -4578,6 +4578,7 @@ rb_big_pow(VALUE x, VALUE y)
double d;
SIGNED_VALUE yy;
again:
if (y == INT2FIX(0)) return INT2FIX(1);
switch (TYPE(y)) {
case T_FLOAT:
@ -4587,6 +4588,9 @@ rb_big_pow(VALUE x, VALUE y)
break;
case T_BIGNUM:
y = bignorm(y);
if (FIXNUM_P(y))
goto again;
rb_warn("in a**b, b may be too big");
d = rb_big2dbl(y);
break;
@ -4599,11 +4603,12 @@ rb_big_pow(VALUE x, VALUE y)
else {
VALUE z = 0;
SIGNED_VALUE mask;
const long xlen = RBIGNUM_LEN(x);
const long xbits = BITSPERDIG*xlen - nlz(RBIGNUM_DIGITS(x)[xlen-1]);
const long BIGLEN_LIMIT = 32*1024*1024;
const size_t xbits = rb_absint_numwords(x, 1, NULL);
const size_t BIGLEN_LIMIT = 32*1024*1024;
if ((xbits > BIGLEN_LIMIT) || (xbits * yy > BIGLEN_LIMIT)) {
if (xbits == (size_t)-1 ||
(xbits > BIGLEN_LIMIT) ||
(xbits * yy > BIGLEN_LIMIT)) {
rb_warn("in a**b, b may be too big");
d = (double)yy;
break;