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rtl.h (rebuild_jump_labels): Declare. 

* rtl.h (rebuild_jump_labels): Declare.
        * jump.c (jump_optimize_1): Renamed from jump_optimize.  Make static.
        Add new argument MARK_LABELS_ONLY.  Quit after mark_all_labels if
        requested.
        (jump_optimize, rebuild_jump_labels): New wrapper functions for
        jump_optimize_1.
        * toplev.c (rest_of_compilation): Use rebuild_jump_labels instead of
        running the entire jump optimizer.

From-SVN: r26327
This commit is contained in:
Jeffrey A Law 1999-04-10 04:17:51 +00:00 committed by Jeff Law
parent 5d90cd8ff3
commit c44033714b
4 changed files with 53 additions and 14 deletions
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9
gcc/ChangeLog
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@ -14,6 +14,15 @@
Sat Apr 10 03:50:12 1999 Jeffrey A Law (law@cygnus.com)
* rtl.h (rebuild_jump_labels): Declare.
* jump.c (jump_optimize_1): Renamed from jump_optimize. Make static.
Add new argument MARK_LABELS_ONLY. Quit after mark_all_labels if
requested.
(jump_optimize, rebuild_jump_labels): New wrapper functions for
jump_optimize_1.
* toplev.c (rest_of_compilation): Use rebuild_jump_labels instead of
running the entire jump optimizer.
* rtl.h (local_alloc): Returns an integer now.
* local-alloc.c (recorded_label_ref): New file scoped variable.
(local_alloc): Initialize recorded_label_ref to zero. Return its

35
gcc/jump.c
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@ -126,9 +126,33 @@ static void delete_from_jump_chain PROTO((rtx));
static int delete_labelref_insn PROTO((rtx, rtx, int));
static void mark_modified_reg PROTO((rtx, rtx));
static void redirect_tablejump PROTO((rtx, rtx));
static void jump_optimize_1 PROTO ((rtx, int, int, int, int));
#ifndef HAVE_cc0
static rtx find_insert_position PROTO((rtx, rtx));
#endif
/* Main external entry point into the jump optimizer. See comments before
jump_optimize_1 for descriptions of the arguments. */
void
jump_optimize (f, cross_jump, noop_moves, after_regscan)
rtx f;
int cross_jump;
int noop_moves;
int after_regscan;
{
jump_optimize_1 (f, cross_jump, noop_moves, after_regscan, 0);
}
/* Alternate entry into the jump optimizer. This entry point only rebuilds
the JUMP_LABEL field in jumping insns and REG_LABEL notes in non-jumping
instructions. */
void
rebuild_jump_labels (f)
rtx f;
{
jump_optimize_1 (f, 0, 0, 0, 1);
}
/* Delete no-op jumps and optimize jumps to jumps
and jumps around jumps.
@ -143,6 +167,9 @@ static rtx find_insert_position PROTO((rtx, rtx));
If AFTER_REGSCAN is nonzero, then this jump pass is being run immediately
after regscan, and it is safe to use regno_first_uid and regno_last_uid.
If MARK_LABELS_ONLY is nonzero, then we only rebuild the jump chain
and JUMP_LABEL field for jumping insns.
If `optimize' is zero, don't change any code,
just determine whether control drops off the end of the function.
This case occurs when we have -W and not -O.
@ -150,11 +177,12 @@ static rtx find_insert_position PROTO((rtx, rtx));
and refrains from actually deleting when that is 0. */
void
jump_optimize (f, cross_jump, noop_moves, after_regscan)
jump_optimize_1 (f, cross_jump, noop_moves, after_regscan, mark_labels_only)
rtx f;
int cross_jump;
int noop_moves;
int after_regscan;
int mark_labels_only;
{
register rtx insn, next;
int changed;
@ -182,6 +210,11 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
mark_all_labels (f, cross_jump);
/* Quit now if we just wanted to rebuild the JUMP_LABEL and REG_LABEL
notes. */
if (mark_labels_only)
return;
/* Keep track of labels used from static data;
they cannot ever be deleted. */

1
gcc/rtl.h
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@ -1354,6 +1354,7 @@ extern int rtx_renumbered_equal_p PROTO ((rtx, rtx));
extern int true_regnum PROTO ((rtx));
extern int redirect_jump PROTO ((rtx, rtx));
extern void jump_optimize PROTO ((rtx, int, int, int));
extern void rebuild_jump_labels PROTO ((rtx));
extern void thread_jumps PROTO ((rtx, int, int));
extern int redirect_exp PROTO ((rtx *, rtx, rtx, rtx));
extern int rtx_equal_for_thread_p PROTO ((rtx, rtx, rtx));

22
gcc/toplev.c
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@ -3526,7 +3526,7 @@ rest_of_compilation (decl)
/* Likewise, for DECL_ARGUMENTS. */
tree saved_arguments = 0;
int failure = 0;
int run_jump_after_reload;
int rebuild_label_notes_after_reload;
/* If we are reconsidering an inline function
at the end of compilation, skip the stuff for making it inline. */
@ -4074,10 +4074,10 @@ rest_of_compilation (decl)
{
recompute_reg_usage (insns, ! optimize_size);
regclass (insns, max_reg_num ());
run_jump_after_reload = local_alloc ();
rebuild_label_notes_after_reload = local_alloc ();
});
else
run_jump_after_reload = 0;
rebuild_label_notes_after_reload = 0;
/* Dump rtl code after allocating regs within basic blocks. */
@ -4112,20 +4112,16 @@ rest_of_compilation (decl)
if (failure)
goto exit_rest_of_compilation;
/* Register allocation and reloading may have turned an indirect jump into
a direct jump. If so, we must rerun the jump optimizer to ensure that
the JUMP_LABEL of any jump changed by that transformation is valid.
We do this before reload_cse_regs since it may allow reload_cse to do
a better job. */
if (run_jump_after_reload)
TIMEVAR (jump_time, jump_optimize (insns, !JUMP_CROSS_JUMP,
!JUMP_NOOP_MOVES, !JUMP_AFTER_REGSCAN));
/* Do a very simple CSE pass over just the hard registers. */
if (optimize > 0)
reload_cse_regs (insns);
/* Register allocation and reloading may have turned an indirect jump into
a direct jump. If so, we must rebuild the JUMP_LABEL fields of
jumping instructions. */
if (rebuild_label_notes_after_reload)
TIMEVAR (jump_time, rebuild_jump_labels (insns));
/* If optimizing and we are performing instruction scheduling after
reload, then go ahead and split insns now since we are about to
recompute flow information anyway.