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* bignum.c (bigdivrem): Use nlz.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41275 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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akr 2013-06-13 09:35:05 +00:00
parent 392d7a797a
commit db3b317ca7
2 changed files with 6 additions and 5 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
Thu Jun 13 18:34:20 2013 Tanaka Akira <akr@fsij.org>
* bignum.c (bigdivrem): Use nlz.
Thu Jun 13 14:51:06 2013 Nobuyoshi Nakada <nobu@ruby-lang.org>
* include/ruby/ruby.h (RUBY_SAFE_LEVEL_CHECK): check constant safe

7
bignum.c
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@ -3793,12 +3793,9 @@ bigdivrem(VALUE x, VALUE y, volatile VALUE *divp, volatile VALUE *modp)
if (nx==ny) zds[nx+1] = 0;
while (!yds[ny-1]) ny--;
dd = 0;
q = yds[ny-1];
while ((q & (BDIGIT)(1UL<<(BITSPERDIG-1))) == 0) {
q <<= 1UL;
dd++;
}
dd = nlz(q);
q <<= dd;
if (dd) {
yy = rb_big_clone(y);
tds = BDIGITS(yy);