You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
/* TODO
- reordering of memory allocation and freeing to be more space efficient
#include "intl.h"
#include "obstack.h"
#include "timevar.h"
+#include "tree-pass.h"
/* Propagate flow information through back edges and thus enable PRE's
moving loop invariant calculations out of loops.
static int gcse_create_count;
/* Number of local constants propagated. */
static int local_const_prop_count;
-/* Number of local copys propagated. */
+/* Number of local copies propagated. */
static int local_copy_prop_count;
/* Number of global constants propagated. */
static int global_const_prop_count;
-/* Number of global copys propagated. */
+/* Number of global copies propagated. */
static int global_copy_prop_count;
\f
/* For available exprs */
load_killed_in_block_p (basic_block bb, int uid_limit, rtx x, int avail_p)
{
rtx list_entry = modify_mem_list[bb->index];
+
+ /* If this is a readonly then we aren't going to be changing it. */
+ if (MEM_READONLY_P (x))
+ return 0;
+
while (list_entry)
{
rtx setter;
return;
case MEM:
- {
- bitmap_iterator bi;
- unsigned bb_index;
-
- /* First handle all the blocks with calls. We don't need to
- do any list walking for them. */
- EXECUTE_IF_SET_IN_BITMAP (blocks_with_calls, 0, bb_index, bi)
- {
- if (set_p)
- SET_BIT (bmap[bb_index], indx);
- else
- RESET_BIT (bmap[bb_index], indx);
- }
+ if (! MEM_READONLY_P (x))
+ {
+ bitmap_iterator bi;
+ unsigned bb_index;
- /* Now iterate over the blocks which have memory modifications
- but which do not have any calls. */
- EXECUTE_IF_AND_COMPL_IN_BITMAP (modify_mem_list_set, blocks_with_calls,
- 0, bb_index, bi)
- {
- rtx list_entry = canon_modify_mem_list[bb_index];
+ /* First handle all the blocks with calls. We don't need to
+ do any list walking for them. */
+ EXECUTE_IF_SET_IN_BITMAP (blocks_with_calls, 0, bb_index, bi)
+ {
+ if (set_p)
+ SET_BIT (bmap[bb_index], indx);
+ else
+ RESET_BIT (bmap[bb_index], indx);
+ }
- while (list_entry)
+ /* Now iterate over the blocks which have memory modifications
+ but which do not have any calls. */
+ EXECUTE_IF_AND_COMPL_IN_BITMAP (modify_mem_list_set,
+ blocks_with_calls,
+ 0, bb_index, bi)
{
- rtx dest, dest_addr;
+ rtx list_entry = canon_modify_mem_list[bb_index];
- /* LIST_ENTRY must be an INSN of some kind that sets memory.
- Examine each hunk of memory that is modified. */
+ while (list_entry)
+ {
+ rtx dest, dest_addr;
- dest = XEXP (list_entry, 0);
- list_entry = XEXP (list_entry, 1);
- dest_addr = XEXP (list_entry, 0);
+ /* LIST_ENTRY must be an INSN of some kind that sets memory.
+ Examine each hunk of memory that is modified. */
- if (canon_true_dependence (dest, GET_MODE (dest), dest_addr,
- x, rtx_addr_varies_p))
- {
- if (set_p)
- SET_BIT (bmap[bb_index], indx);
- else
- RESET_BIT (bmap[bb_index], indx);
- break;
- }
- list_entry = XEXP (list_entry, 1);
+ dest = XEXP (list_entry, 0);
+ list_entry = XEXP (list_entry, 1);
+ dest_addr = XEXP (list_entry, 0);
+
+ if (canon_true_dependence (dest, GET_MODE (dest), dest_addr,
+ x, rtx_addr_varies_p))
+ {
+ if (set_p)
+ SET_BIT (bmap[bb_index], indx);
+ else
+ RESET_BIT (bmap[bb_index], indx);
+ break;
+ }
+ list_entry = XEXP (list_entry, 1);
+ }
}
- }
- }
+ }
x = XEXP (x, 0);
goto repeat;
{
fprintf (gcse_file, "CPROP of %s, pass %d: %d bytes needed, ",
current_function_name (), pass, bytes_used);
- fprintf (gcse_file, "%d local const props, %d local copy props\n\n",
+ fprintf (gcse_file, "%d local const props, %d local copy props, ",
local_const_prop_count, local_copy_prop_count);
fprintf (gcse_file, "%d global const props, %d global copy props\n\n",
global_const_prop_count, global_copy_prop_count);
graceful degradation. */
if (n_edges > 20000 + n_basic_blocks * 4)
{
- if (warn_disabled_optimization)
- warning ("%s: %d basic blocks and %d edges/basic block",
- pass, n_basic_blocks, n_edges / n_basic_blocks);
+ warning (OPT_Wdisabled_optimization,
+ "%s: %d basic blocks and %d edges/basic block",
+ pass, n_basic_blocks, n_edges / n_basic_blocks);
return true;
}
* SBITMAP_SET_SIZE (max_reg_num ())
* sizeof (SBITMAP_ELT_TYPE)) > MAX_GCSE_MEMORY)
{
- if (warn_disabled_optimization)
- warning ("%s: %d basic blocks and %d registers",
- pass, n_basic_blocks, max_reg_num ());
+ warning (OPT_Wdisabled_optimization,
+ "%s: %d basic blocks and %d registers",
+ pass, n_basic_blocks, max_reg_num ());
return true;
}
return false;
}
+\f
+static bool
+gate_handle_jump_bypass (void)
+{
+ return optimize > 0 && flag_gcse;
+}
+
+/* Perform jump bypassing and control flow optimizations. */
+static void
+rest_of_handle_jump_bypass (void)
+{
+ cleanup_cfg (CLEANUP_EXPENSIVE);
+ reg_scan (get_insns (), max_reg_num ());
+
+ if (bypass_jumps (dump_file))
+ {
+ rebuild_jump_labels (get_insns ());
+ cleanup_cfg (CLEANUP_EXPENSIVE);
+ delete_trivially_dead_insns (get_insns (), max_reg_num ());
+ }
+}
+
+struct tree_opt_pass pass_jump_bypass =
+{
+ "bypass", /* name */
+ gate_handle_jump_bypass, /* gate */
+ rest_of_handle_jump_bypass, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ TV_BYPASS, /* tv_id */
+ 0, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ TODO_dump_func |
+ TODO_ggc_collect | TODO_verify_flow, /* todo_flags_finish */
+ 'G' /* letter */
+};
+
+
+static bool
+gate_handle_gcse (void)
+{
+ return optimize > 0 && flag_gcse;
+}
+
+
+static void
+rest_of_handle_gcse (void)
+{
+ int save_csb, save_cfj;
+ int tem2 = 0, tem;
+
+ tem = gcse_main (get_insns (), dump_file);
+ rebuild_jump_labels (get_insns ());
+ delete_trivially_dead_insns (get_insns (), max_reg_num ());
+
+ save_csb = flag_cse_skip_blocks;
+ save_cfj = flag_cse_follow_jumps;
+ flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
+
+ /* If -fexpensive-optimizations, re-run CSE to clean up things done
+ by gcse. */
+ if (flag_expensive_optimizations)
+ {
+ timevar_push (TV_CSE);
+ reg_scan (get_insns (), max_reg_num ());
+ tem2 = cse_main (get_insns (), max_reg_num (), dump_file);
+ purge_all_dead_edges ();
+ delete_trivially_dead_insns (get_insns (), max_reg_num ());
+ timevar_pop (TV_CSE);
+ cse_not_expected = !flag_rerun_cse_after_loop;
+ }
+
+ /* If gcse or cse altered any jumps, rerun jump optimizations to clean
+ things up. */
+ if (tem || tem2)
+ {
+ timevar_push (TV_JUMP);
+ rebuild_jump_labels (get_insns ());
+ delete_dead_jumptables ();
+ cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
+ timevar_pop (TV_JUMP);
+ }
+
+ flag_cse_skip_blocks = save_csb;
+ flag_cse_follow_jumps = save_cfj;
+}
+
+struct tree_opt_pass pass_gcse =
+{
+ "gcse1", /* name */
+ gate_handle_gcse, /* gate */
+ rest_of_handle_gcse, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ TV_GCSE, /* tv_id */
+ 0, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ TODO_dump_func |
+ TODO_verify_flow | TODO_ggc_collect, /* todo_flags_finish */
+ 'G' /* letter */
+};
+
#include "gt-gcse.h"
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