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rational.c: optimize Rational#abs

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* rational.c (rb_rational_abs): optimize Rational#abs with the
  specialized implementation.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56808 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
mrkn 2016-11-16 04:25:33 +00:00
parent b252126d6d
commit ab9b7890c2
1 changed files with 26 additions and 0 deletions
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26
rational.c
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@ -1235,6 +1235,30 @@ nurat_negative_p(VALUE self)
return f_boolcast(INT_NEGATIVE_P(dat->num)); return f_boolcast(INT_NEGATIVE_P(dat->num));
} }
/*
* call-seq:
* rat.abs -> rat
* rat.magnitude -> rat
*
* Returns the absolute value of +rat+.
*
* (1/2r).abs #=> 1/2r
* (-1/2r).abs #=> 1/2r
*
* Rational#magnitude is an alias of Rational#abs.
*/
VALUE
rb_rational_abs(VALUE self)
{
get_dat1(self);
if (INT_NEGATIVE_P(dat->num)) {
VALUE num = rb_int_abs(dat->num);
return nurat_s_canonicalize_internal_no_reduce(CLASS_OF(self), num, dat->den);
}
return self;
}
static VALUE static VALUE
nurat_floor(VALUE self) nurat_floor(VALUE self)
{ {
@ -2640,6 +2664,8 @@ Init_Rational(void)
#endif #endif
rb_define_method(rb_cRational, "positive?", nurat_positive_p, 0); rb_define_method(rb_cRational, "positive?", nurat_positive_p, 0);
rb_define_method(rb_cRational, "negative?", nurat_negative_p, 0); rb_define_method(rb_cRational, "negative?", nurat_negative_p, 0);
rb_define_method(rb_cRational, "abs", rb_rational_abs, 0);
rb_define_method(rb_cRational, "magnitude", rb_rational_abs, 0);
rb_define_method(rb_cRational, "floor", nurat_floor_n, -1); rb_define_method(rb_cRational, "floor", nurat_floor_n, -1);
rb_define_method(rb_cRational, "ceil", nurat_ceil_n, -1); rb_define_method(rb_cRational, "ceil", nurat_ceil_n, -1);