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toplev.c (rest_of_compilation): Do jump threading before SSA path... 

* toplev.c (rest_of_compilation): Do jump threading before SSA path;
	consistently call delete_trivially_dead_insns after CSE and GCSE;
	fix DFI_life dumping; do jump threading after liveness; do crossjumping
	after liveness2; update comment in last crossjumping.
	* cfgcleanup.c (try_crossjump_to_edge): Dirtify block.

From-SVN: r50373
This commit is contained in:
Jan Hubicka 2002-03-06 20:34:36 +01:00 committed by Jan Hubicka
parent 31d0dd4fa3
commit 2ca6672b27
3 changed files with 24 additions and 16 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
Wed Mar 6 20:32:09 CET 2002 Jan Hubicka <jh@suse.cz>
* toplev.c (rest_of_compilation): Do jump threading before SSA path;
consistently call delete_trivially_dead_insns after CSE and GCSE;
fix DFI_life dumping; do jump threading after liveness; do crossjumping
after liveness2; update comment in last crossjumping.
* cfgcleanup.c (try_crossjump_to_edge): Dirtify block.
Wed Mar 6 12:27:10 2002 Jeffrey A Law (law@redhat.com)
* m68k.h (CONST_COSTS): Lower cost of 0.0 when used inside a

2
gcc/cfgcleanup.c
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@ -1353,6 +1353,8 @@ try_crossjump_to_edge (mode, e1, e2)
redirect_to->count += src1->count;
redirect_to->frequency += src1->frequency;
/* We may have some registers visible trought the block. */
redirect_to->flags |= BB_DIRTY;
/* Recompute the frequencies and counts of outgoing edges. */
for (s = redirect_to->succ; s; s = s->succ_next)

30
gcc/toplev.c
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@ -2629,7 +2629,8 @@ rest_of_compilation (decl)
find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
if (rtl_dump_file)
dump_flow_info (rtl_dump_file);
cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP);
cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
| (flag_thread_jumps ? CLEANUP_THREADING : 0));
/* CFG is no longer maintained up-to-date. */
free_bb_for_insn ();
@ -2722,8 +2723,7 @@ rest_of_compilation (decl)
find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
if (rtl_dump_file)
dump_flow_info (rtl_dump_file);
cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP
| (flag_thread_jumps ? CLEANUP_THREADING : 0));
cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
/* Try to identify useless null pointer tests and delete them. */
if (flag_delete_null_pointer_checks)
@ -2769,25 +2769,19 @@ rest_of_compilation (decl)
rebuild_jump_labels (insns);
purge_all_dead_edges (0);
delete_trivially_dead_insns (insns, max_reg_num ());
/* If we are not running more CSE passes, then we are no longer
expecting CSE to be run. But always rerun it in a cheap mode. */
cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
if (tem || optimize > 1)
cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
/* Run this after jump optmizations remove all the unreachable code
so that unreachable code will not keep values live. */
delete_trivially_dead_insns (insns, max_reg_num ());
/* Try to identify useless null pointer tests and delete them. */
if (flag_delete_null_pointer_checks || flag_thread_jumps)
{
timevar_push (TV_JUMP);
cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP
| (flag_thread_jumps ? CLEANUP_THREADING : 0));
if (flag_delete_null_pointer_checks)
delete_null_pointer_checks (insns);
/* CFG is no longer maintained up-to-date. */
@ -2827,6 +2821,7 @@ rest_of_compilation (decl)
cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
tem = gcse_main (insns, rtl_dump_file);
rebuild_jump_labels (insns);
delete_trivially_dead_insns (insns, max_reg_num ());
save_csb = flag_cse_skip_blocks;
save_cfj = flag_cse_follow_jumps;
@ -2840,6 +2835,7 @@ rest_of_compilation (decl)
reg_scan (insns, max_reg_num (), 1);
tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
purge_all_dead_edges (0);
delete_trivially_dead_insns (insns, max_reg_num ());
timevar_pop (TV_CSE);
cse_not_expected = !flag_rerun_cse_after_loop;
}
@ -2851,7 +2847,6 @@ rest_of_compilation (decl)
tem = tem2 = 0;
timevar_push (TV_JUMP);
rebuild_jump_labels (insns);
delete_trivially_dead_insns (insns, max_reg_num ());
cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
timevar_pop (TV_JUMP);
@ -2861,6 +2856,7 @@ rest_of_compilation (decl)
reg_scan (insns, max_reg_num (), 1);
tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
purge_all_dead_edges (0);
delete_trivially_dead_insns (insns, max_reg_num ());
timevar_pop (TV_CSE);
}
}
@ -2991,6 +2987,7 @@ rest_of_compilation (decl)
reg_scan (insns, max_reg_num (), 0);
tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
purge_all_dead_edges (0);
delete_trivially_dead_insns (insns, max_reg_num ());
if (tem)
{
@ -3009,7 +3006,7 @@ rest_of_compilation (decl)
cse_not_expected = 1;
close_dump_file (DFI_life, print_rtl_with_bb, insns);
open_dump_file (DFI_life, decl);
regclass_init ();
check_function_return_warnings ();
@ -3277,8 +3274,8 @@ rest_of_compilation (decl)
if (optimize)
{
cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_CROSSJUMP);
life_analysis (insns, rtl_dump_file, PROP_FINAL);
cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_CROSSJUMP | CLEANUP_UPDATE_LIFE);
/* This is kind of a heuristic. We need to run combine_stack_adjustments
even for machines with possibly nonzero RETURN_POPS_ARGS
@ -3380,8 +3377,9 @@ rest_of_compilation (decl)
timevar_push (TV_REORDER_BLOCKS);
open_dump_file (DFI_bbro, decl);
/* Last attempt to optimize CFG, as life analyzis possibly removed
some instructions. */
/* Last attempt to optimize CFG, as scheduling, peepholing
and insn splitting possibly introduced more crossjumping
oppurtuntities. */
cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
| CLEANUP_CROSSJUMP);
if (flag_reorder_blocks)