* regclass.c: Revert my Jan 4 change to loop cost computation.

From-SVN: r31210

gcc/ChangeLog

+Tue Jan  4 11:44:13 2000  Jeffrey A Law  (law@cygnus.com)
+
+	* regclass.c: Revert my Jan 4 change to loop cost computation.
+
 Tue Jan  4 19:22:39 MET 2000  Jan Hubicka  <hubicka@freesoft.cz>
 
 	* regclass.c (regclass): Do not obey REG_N_REFS in non-optimizing

gcc/regclass.c

@@ -1100,17 +1100,13 @@ regclass (f, nregs, dump)
 	    basic_block bb = BASIC_BLOCK (index);
 
 	    /* Show that an insn inside a loop is likely to be executed three
-	       times more than insns outside a loop.  This is much more
-	       aggressive than the assumptions made elsewhere and is being
-	       tried as an experiment. 
-
-	       Note that a block's loop depth starts at zero, not one!  We
-	       must not subract one from the loop depth as that could give
-	       a negative shift count below.  */
+	       times more than insns outside a loop.  This is much more aggressive
+	       than the assumptions made elsewhere and is being tried as an
+	       experiment.  */
 	    if (optimize_size)
 	      loop_cost = 1;
 	    else
-	      loop_cost = 1 << (2 * MIN (bb->loop_depth, 5));
+	      loop_cost = 1 << (2 * MIN (bb->loop_depth - 1, 5));
 	    for (insn = bb->head; ; insn = NEXT_INSN (insn))
 	      {
 		insn = scan_one_insn (insn, pass);