nobu	2017-01-05 16:27:19 +0900 (Thu, 05 Jan 2017)

  New Revision: 57270

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=57270

  Log:
    numeric.c: short circuit
    
    * numeric.c (int_pow): short circuit when y is 0, always return 1.

  Modified files:
    trunk/numeric.c
Index: numeric.c
===================================================================
--- numeric.c	(revision 57269)
+++ numeric.c	(revision 57270)
@@ -3892,6 +3892,7 @@ int_pow(long x, unsigned long y) https://github.com/ruby/ruby/blob/trunk/numeric.c#L3892
     int neg = x < 0;
     long z = 1;
 
+    if (y == 0) return INT2FIX(1);
     if (neg) x = -x;
     if (y & 1)
 	z = x;

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