predict.c (estimate_bb_frequencies): Do frequency calculation with a volatile temporary.

        * predict.c (estimate_bb_frequencies): Do frequency calculation
        with a volatile temporary.

From-SVN: r51879

gcc/ChangeLog

+2002-04-04  Richard Henderson  <rth@redhat.com>
+
+	* predict.c (estimate_bb_frequencies): Do frequency calculation
+	with a volatile temporary.
+
 2002-04-04  Ulrich Weigand  <uweigand@de.ibm.com>
 
 	* config/s390/linux.h (LOCAL_LABEL_PREFIX): Define.

gcc/predict.c

@@ -942,6 +942,7 @@ estimate_bb_frequencies (loops)
   for (i = -2; i < n_basic_blocks; i++)
     {
       basic_block bb;
+      volatile double tmp;
 
       if (i == -2)
 	bb = ENTRY_BLOCK_PTR;
@@ -949,8 +950,12 @@ estimate_bb_frequencies (loops)
 	bb = EXIT_BLOCK_PTR;
       else
 	bb = BASIC_BLOCK (i);
-      bb->frequency
-	= BLOCK_INFO (bb)->frequency * BB_FREQ_MAX / freq_max + 0.5;
+
+      /* ??? Prevent rounding differences due to optimization on x86.  */
+      tmp = BLOCK_INFO (bb)->frequency * BB_FREQ_MAX;
+      tmp /= freq_max;
+      tmp += 0.5;
+      bb->frequency = tmp;
     }
 
   free_aux_for_blocks ();