complex.c: Optimize Complex#* and Complex#**

Optimize f_mul for the core numeric class components.
This change improves the computation time of Complex#* and Complex#**.

```
$ make benchmark ITEM=complex_float_ COMPARE_RUBY=/Users/mrkn/.rbenv/versions/2.6.0/bin/ruby
generating known_errors.inc
known_errors.inc unchanged
/Users/mrkn/src/github.com/ruby/ruby/revision.h unchanged
/Users/mrkn/.rbenv/shims/ruby --disable=gems -rrubygems -I/Users/mrkn/src/github.com/ruby/ruby/benchmark/lib /Users/mrkn/src/github.com/ruby/ruby/benchmark/benchmark-driver/exe/benchmark-driver \
                    --executables="compare-ruby::/Users/mrkn/.rbenv/versions/2.6.0/bin/ruby -I.ext/common --disable-gem" \
                    --executables="built-ruby::./miniruby -I/Users/mrkn/src/github.com/ruby/ruby/lib -I. -I.ext/common  -r/Users/mrkn/src/github.com/ruby/ruby/prelude --disable-gem" \
                    $(find /Users/mrkn/src/github.com/ruby/ruby/benchmark -maxdepth 1 -name '*complex_float_*.yml' -o -name '*complex_float_*.rb' | sort)
Calculating -------------------------------------
                     compare-ruby  built-ruby
   complex_float_add       6.558M     13.012M i/s -      1.000M times in 0.152480s 0.076850s
   complex_float_div     576.821k    567.969k i/s -      1.000M times in 1.733640s 1.760660s
   complex_float_mul       1.690M      2.628M i/s -      1.000M times in 0.591786s 0.380579s
   complex_float_new       1.350M      1.268M i/s -      1.000M times in 0.740669s 0.788762s
 complex_float_power       1.571M      1.835M i/s -      1.000M times in 0.636507s 0.544909s
   complex_float_sub       8.635M      8.779M i/s -      1.000M times in 0.115814s 0.113906s

Comparison:
                complex_float_add
          built-ruby:  13012361.7 i/s
        compare-ruby:   6558237.1 i/s - 1.98x  slower

                complex_float_div
        compare-ruby:    576821.0 i/s
          built-ruby:    567968.8 i/s - 1.02x  slower

                complex_float_mul
          built-ruby:   2627575.4 i/s
        compare-ruby:   1689800.0 i/s - 1.55x  slower

                complex_float_new
        compare-ruby:   1350130.8 i/s
          built-ruby:   1267809.6 i/s - 1.06x  slower

              complex_float_power
          built-ruby:   1835168.8 i/s
        compare-ruby:   1571074.6 i/s - 1.17x  slower

                complex_float_sub
          built-ruby:   8779168.8 i/s
        compare-ruby:   8634534.7 i/s - 1.02x  slower
```

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66697 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 4 deletions

diff --git a/rational.c b/rational.c
index 089f5d54f1..bbae5fe7d1 100644
--- a/rational.c
+++ b/rational.c
@@ -877,8 +877,8 @@ f_muldiv(VALUE self, VALUE anum, VALUE aden, VALUE bnum, VALUE bden, int k)
  *    Rational(9, 8)  * 4                #=> (9/2)
  *    Rational(20, 9) * 9.8              #=> 21.77777777777778
  */
-static VALUE
-nurat_mul(VALUE self, VALUE other)
+VALUE
+rb_rational_mul(VALUE self, VALUE other)
 {
     if (RB_INTEGER_TYPE_P(other)) {
 	{
@@ -1396,7 +1396,7 @@ f_round_common(int argc, VALUE *argv, VALUE self, VALUE (*func)(VALUE))
 	rb_raise(rb_eTypeError, "not an integer");
 
     b = f_expt10(n);
-    s = nurat_mul(self, b);
+    s = rb_rational_mul(self, b);
 
     if (k_float_p(s)) {
 	if (INT_NEGATIVE_P(n))
@@ -2734,7 +2734,7 @@ Init_Rational(void)
     rb_define_method(rb_cRational, "-@", rb_rational_uminus, 0);
     rb_define_method(rb_cRational, "+", rb_rational_plus, 1);
     rb_define_method(rb_cRational, "-", nurat_sub, 1);
-    rb_define_method(rb_cRational, "*", nurat_mul, 1);
+    rb_define_method(rb_cRational, "*", rb_rational_mul, 1);
     rb_define_method(rb_cRational, "/", nurat_div, 1);
     rb_define_method(rb_cRational, "quo", nurat_div, 1);
     rb_define_method(rb_cRational, "fdiv", nurat_fdiv, 1);