naruse	2013-04-22 11:59:09 +0900 (Mon, 22 Apr 2013)

  New Revision: 40404

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=40404

  Log:
    * util.c (ruby_hdtoa): revert r29729.
      If you want ruby to behave as before on x86, specify to use SSE like
      -msse2 -mfpmath=sse for gcc.

  Modified files:
    trunk/ChangeLog
    trunk/util.c

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 40403)
+++ ChangeLog	(revision 40404)
@@ -1,3 +1,9 @@ https://github.com/ruby/ruby/blob/trunk/ChangeLog#L1
+Mon Apr 22 10:25:21 2013  NARUSE, Yui  <naruse@r...>
+
+	* util.c (ruby_hdtoa): revert r29729.
+	  If you want ruby to behave as before on x86, specify to use SSE like
+	  -msse2 -mfpmath=sse for gcc.
+
 Sun Apr 21 23:19:00 2013  Charlie Somerville  <charlie@c...>
 
 	* configure.in: Revert using sigsetjmp by default due to performance
Index: util.c
===================================================================
--- util.c	(revision 40403)
+++ util.c	(revision 40404)
@@ -3878,13 +3878,10 @@ ruby_hdtoa(double d, const char *xdigs, https://github.com/ruby/ruby/blob/trunk/util.c#L3878
 	/* Round to the desired number of digits. */
 	if (SIGFIGS > ndigits && ndigits > 0) {
 		float redux = 1.0f;
-		volatile double d;
 		int offset = 4 * ndigits + DBL_MAX_EXP - 4 - DBL_MANT_DIG;
 		dexp_set(u, offset);
-		d = u.d;
-		d += redux;
-		d -= redux;
-		u.d = d;
+		u.d += redux;
+		u.d -= redux;
 		*decpt += dexp_get(u) - offset;
 	}
 

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