(float_to_usi): Move code for negative numbers before code for infinity.

(float_to_usi): Move code for negative numbers before code
for infinity.  Modify infinty code to only handle positive infinities.

From-SVN: r14368

gcc/config/fp-bit.c

@@ -1300,12 +1300,12 @@ float_to_usi (FLO_type arg_a)
     return 0;
   if (isnan (&a))
     return 0;
-  /* get reasonable MAX_USI_INT... */
-  if (isinf (&a))
-    return a.sign ? MAX_USI_INT : 0;
   /* it is a negative number */
   if (a.sign)
     return 0;
+  /* get reasonable MAX_USI_INT... */
+  if (isinf (&a))
+    return MAX_USI_INT;
   /* it is a number, but a small one */
   if (a.normal_exp < 0)
     return 0;