gcse.c (gcse_main): Don't rebuild the CFG here.

        * gcse.c (gcse_main): Don't rebuild the CFG here.
        (delete_null_pointer_checks): Likewise.
        * ssa.c (convert_to_ssa): Likewise.
        * toplev.c (rest_of_compilation): Do it here instead.  Combine
        sequential calls to TIMEVAR.  Consistently use `insns' instead of
        `get_insns()'.  Always split insns after reload when optimizing.

From-SVN: r32995

gcc/ChangeLog

 2000-04-07  Richard Henderson  <rth@cygnus.com>
 
+	* gcse.c (gcse_main): Don't rebuild the CFG here.
+	(delete_null_pointer_checks): Likewise.
+	* ssa.c (convert_to_ssa): Likewise.
+	* toplev.c (rest_of_compilation): Do it here instead.  Combine
+	sequential calls to TIMEVAR.  Consistently use `insns' instead of
+	`get_insns()'.  Always split insns after reload when optimizing.
+
 	* basic-block.h (merge_blocks_nomove): Declare.
 	(tidy_fallthru_edge): Declare.
 	* flow.c (merge_blocks_nomove): Document as merging into previous

gcc/gcse.c

@@ -669,18 +669,13 @@ gcse_main (f, file)
   /* Identify the basic block information for this function, including
      successors and predecessors.  */
   max_gcse_regno = max_reg_num ();
-  find_basic_blocks (f, max_gcse_regno, file);
-  cleanup_cfg (f);
 
   if (file)
     dump_flow_info (file);
 
   /* Return if there's nothing to do.  */
   if (n_basic_blocks <= 1)
-    {
-      free_basic_block_vars (0);
-      return 0;
-    }
+    return 0;
 
   /* Trying to perform global optimizations on flow graphs which have
      a high connectivity will take a long time and is unlikely to be
@@ -691,10 +686,7 @@ gcse_main (f, file)
      a couple switch statements.  So we require a relatively large number
      of basic blocks and the ratio of edges to blocks to be high.  */
   if (n_basic_blocks > 1000 && n_edges / n_basic_blocks >= 20)
-    {
-      free_basic_block_vars (0);
-      return 0;
-    }
+    return 0;
 
   /* See what modes support reg/reg copy operations.  */
   if (! can_copy_init_p)
@@ -807,7 +799,6 @@ gcse_main (f, file)
 
   obstack_free (&gcse_obstack, NULL_PTR);
   free_reg_set_mem ();
-  free_basic_block_vars (0);
   return run_jump_opt_after_gcse;
 }
 
@@ -5070,17 +5061,9 @@ delete_null_pointer_checks (f)
   int max_reg;
   struct null_pointer_info npi;
 
-  /* First break the program into basic blocks.  */
-  find_basic_blocks (f, max_reg_num (), NULL);
-  cleanup_cfg (f);
-
   /* If we have only a single block, then there's nothing to do.  */
   if (n_basic_blocks <= 1)
-    {
-      /* Free storage allocated by find_basic_blocks.  */
-      free_basic_block_vars (0);
-      return;
-    }
+    return;
 
   /* Trying to perform global optimizations on flow graphs which have
      a high connectivity will take a long time and is unlikely to be
@@ -5091,11 +5074,7 @@ delete_null_pointer_checks (f)
      a couple switch statements.  So we require a relatively large number
      of basic blocks and the ratio of edges to blocks to be high.  */
   if (n_basic_blocks > 1000 && n_edges / n_basic_blocks >= 20)
-    {
-      /* Free storage allocated by find_basic_blocks.  */
-      free_basic_block_vars (0);
-      return;
-    }
+    return;
 
   /* We need four bitmaps, each with a bit for each register in each
      basic block.  */
@@ -5152,9 +5131,6 @@ delete_null_pointer_checks (f)
 				    nonnull_avout, &npi);
     }
 
-  /* Free storage allocated by find_basic_blocks.  */
-  free_basic_block_vars (0);
-
   /* Free the table of registers compared at the end of every block.  */
   free (block_reg);
 

gcc/ssa.c

@@ -855,10 +855,6 @@ convert_to_ssa()
   if (in_ssa_form)
     abort ();
 
-  find_basic_blocks (get_insns (), max_reg_num(), NULL);
-  /* The dominator algorithms assume all blocks are reachable; clean
-     up first.  */
-  cleanup_cfg (get_insns ());
   /* Don't eliminate dead code here.  The CFG we computed above must
      remain unchanged until we are finished emerging from SSA form --
      the phi node representation depends on it.  */
@@ -930,8 +926,6 @@ convert_to_ssa()
   in_ssa_form = 1;
 
   reg_scan (get_insns (), max_reg_num (), 1);
-  find_basic_blocks (get_insns (), max_reg_num (), NULL);
-  life_analysis (get_insns (), max_reg_num (), NULL, 0);
 }
 
 
@@ -1818,7 +1812,6 @@ convert_from_ssa()
   rtx insns = get_insns ();
     
   /* We need up-to-date life information.  */
-  find_basic_blocks (insns, max_reg_num (), NULL);
   life_analysis (insns, max_reg_num (), NULL, 0);
 
   /* Figure out which regs in copies and phi nodes don't conflict and