nobu	2017-05-10 09:20:02 +0900 (Wed, 10 May 2017)

  New Revision: 58645

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=58645

  Log:
    math.c (ruby_lgamma_r): reduce duplicate code

  Modified files:
    trunk/math.c
Index: math.c
===================================================================
--- math.c	(revision 58644)
+++ math.c	(revision 58645)
@@ -800,11 +800,8 @@ ruby_lgamma_r(const double d, int *sign) https://github.com/ruby/ruby/blob/trunk/math.c#L800
 {
     const double g = lgamma_r(d, sign);
     if (isinf(g)) {
-	if (d == 0.0 && signbit(d)) {
-	    *sign = -1;
-	    return INFINITY;
-	} else if (d == 0.0 && !signbit(d)) {
-	    *sign = 1;
+	if (d == 0.0) {
+	    *sign = signbit(d) ? -1 : +1;
 	    return INFINITY;
 	}
     }

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