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

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ee335f2176e482a75227ca33ccc16e85af596cc2..c1b2a285886436eb1c3d5a57b84e62de890e4404 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+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

diff --git a/gcc/real.c b/gcc/real.c
index 231fc96c932a7bc43d4cbf339d39f57d2ee70b9a..1c2f709c9d01a68c112e02d7d7a9eeaa55383903 100644 (file)
--- a/gcc/real.c
+++ b/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