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* bignum.c (bigdivrem): Specialized implementation added for

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nx == 2 && ny == 2



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42218 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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akr 2013-07-28 15:14:20 +00:00
parent e4b0852ae4
commit 7a9aeb33db
2 changed files with 26 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Mon Jul 29 00:11:49 2013 Tanaka Akira <akr@fsij.org>
* bignum.c (bigdivrem): Specialized implementation added for
nx == 2 && ny == 2
Sun Jul 28 20:28:41 2013 Masaki Matsushita <glass.saga@gmail.com>
* io.c (io_getpartial): use rb_str_locktmp_ensure().

21
bignum.c
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@ -5399,6 +5399,27 @@ bigdivrem(VALUE x, VALUE y, volatile VALUE *divp, volatile VALUE *modp)
if (divp) *divp = z;
return Qnil;
}
if (nx == 2 && ny == 2) {
BDIGIT_DBL x0 = xds[0] | BIGUP(xds[1]);
BDIGIT_DBL y0 = yds[0] | BIGUP(yds[1]);
BDIGIT_DBL q0 = x0 / y0;
BDIGIT_DBL r0 = x0 % y0;
if (divp) {
z = bignew(bdigit_roomof(sizeof(BDIGIT_DBL)), RBIGNUM_SIGN(x)==RBIGNUM_SIGN(y));
zds = BDIGITS(z);
zds[0] = BIGLO(q0);
zds[1] = BIGLO(BIGDN(q0));
*divp = z;
}
if (modp) {
z = bignew(bdigit_roomof(sizeof(BDIGIT_DBL)), RBIGNUM_SIGN(x));
zds = BDIGITS(z);
zds[0] = BIGLO(r0);
zds[1] = BIGLO(BIGDN(r0));
*modp = z;
}
return Qnil;
}
if (BDIGIT_MSB(yds[ny-1]) == 0) {
/* Make yds modifiable. */