Summary: Generate canonical infinity for the Motorola extended real format

* real.c (encode_ieee_extended_motorola): Clear integer bit in the
infinity format.

From-SVN: r212744

gcc/ChangeLog

+2014-07-17  Andreas Schwab  <schwab@linux-m68k.org>
+
+	* real.c (encode_ieee_extended_motorola): Clear integer bit in the
+	infinity format.
+
 2014-07-17  Richard Biener  <rguenther@suse.de>
 
 	PR rtl-optimization/61801

gcc/real.c

@@ -3481,6 +3481,11 @@ encode_ieee_extended_motorola (const struct real_format *fmt, long *buf,
   long intermed[3];
   encode_ieee_extended (fmt, intermed, r);
 
+  if (r->cl == rvc_inf)
+    /* For infinity clear the explicit integer bit again, so that the
+       format matches the canonical infinity generated by the FPU.  */
+    intermed[1] = 0;
+
   /* Motorola chips are assumed always to be big-endian.  Also, the
      padding in a Motorola extended real goes between the exponent and
      the mantissa.  At this point the mantissa is entirely within