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bignum.c: precise fdiv

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* bignum.c (big_fdiv): more precise calculation.  [ruby-dev:49915]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57179 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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nobu 2016-12-25 08:47:22 +00:00
parent 6335fc6fe3
commit c6eb59c439
1 changed files with 2 additions and 0 deletions
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bignum.c
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@ -6102,6 +6102,8 @@ big_fdiv(VALUE x, VALUE y, long ey)
l = BIGNUM_LEN(x);
ex = l * BITSPERDIG - nlz(BDIGITS(x)[l-1]);
ex -= 2 * DBL_BIGDIG * BITSPERDIG;
if (ex > BITSPERDIG) ex -= BITSPERDIG;
else if (ex > 0) ex = 0;
if (ex) x = big_shift(x, ex);
bigdivrem(x, y, &z, 0);