From 3c199bb70045e383258c10b3213899abd9630c81 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 10 Jan 2017 12:18:21 +0000
Subject: 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
---
 numeric.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'numeric.c')

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)) {
-- 
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