fpgnuib.c (__floatsidf): Don't rely on signed overflow.

2005-09-18  Paul Brook  <paul@codesourcery.com>

	* config/m68k/fpgnuib.c (__floatsidf): Don't rely on signed overflow.

From-SVN: r104383

gcc/ChangeLog

+2005-09-18  Paul Brook  <paul@codesourcery.com>
+
+	* config/m68k/fpgnuib.c (__floatsidf): Don't rely on signed overflow.
+
 2005-09-17  Richard Henderson  <rth@redhat.com>
 
 	* tree-pass.h, tree-flow.h, tree-ssa-dce.c: Revert last change.

gcc/config/m68k/fpgnulib.c

@@ -121,7 +121,7 @@ __floatsidf (long a1)
   if (a1 < 0)
     {
       sign = SIGNBIT;
-      a1 = -a1;
+      a1 = (long)-(unsigned long)a1;
       if (a1 < 0)
 	{
 	  dl.l.upper = SIGNBIT | ((32 + EXCESSD) << 20L);