(output_prolog): Fixup code to set stack pointer if stack size > 32k.

From-SVN: r10252

gcc/config/rs6000/rs6000.c

@@ -2538,11 +2538,12 @@ output_prolog (file, size)
 		     reg_names[1], - info->total_size, reg_names[1]);
       else
 	{
+	  int neg_size = - info->total_size;
 	  asm_fprintf (file, "\t{liu|lis} %s,%d\n\t{oril|ori} %s,%s,%d\n",
-		       reg_names[0], (info->total_size >> 16) & 0xffff,
-		       reg_names[0], reg_names[0], info->total_size & 0xffff);
+		       reg_names[0], (neg_size >> 16) & 0xffff,
+		       reg_names[0], reg_names[0], neg_size & 0xffff);
 	  asm_fprintf (file,
-		       (TARGET_64BIT) ? "\tstdux %s,%s,%s\n" : "\tstwux %s,%s,%s\n",
+		       (TARGET_64BIT) ? "\tstdux %s,%s,%s\n" : "\t{stux|stwux} %s,%s,%s\n",
 		       reg_names[1], reg_names[1], reg_names[0]);
 	}
     }