numeric.c: short circuit optimization

* numeric.c (fix_mul): short circuit when multiplication of Bignum
  and 0 or 1 not to make a Bignum unnecessarily.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57296 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 0 deletions

diff --git a/numeric.c b/numeric.c
index ee8c032eef..5f67214cba 100644
--- a/numeric.c
+++ b/numeric.c
@@ -3569,6 +3569,10 @@ fix_mul(VALUE x, VALUE y)
 	return rb_fix_mul_fix(x, y);
     }
     else if (RB_TYPE_P(y, T_BIGNUM)) {
+	switch (x) {
+	  case INT2FIX(0): return x;
+	  case INT2FIX(1): return y;
+	}
 	return rb_big_mul(y, x);
     }
     else if (RB_TYPE_P(y, T_FLOAT)) {