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From: "rakdver at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/17387] Redundant instructions in loop optimization
Date: Sat, 11 Sep 2004 19:55:00 -0000 [thread overview]
Message-ID: <20040911195537.4958.qmail@sourceware.org> (raw)
In-Reply-To: <20040909235415.17387.hjl@lucon.org>
------- Additional Comments From rakdver at gcc dot gnu dot org 2004-09-11 19:55 -------
ivopts gets rid of the extends once the record_bounds pass is enabled by the
following patch. The nonsensical "mov %eax, %eax" type moves however
still remain in the code.
Zdenek
Index: tree-optimize.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/tree-optimize.c,v
retrieving revision 2.45
diff -c -3 -p -r2.45 tree-optimize.c
*** tree-optimize.c 9 Sep 2004 20:53:36 -0000 2.45
--- tree-optimize.c 11 Sep 2004 19:44:56 -0000
*************** init_tree_optimization_passes (void)
*** 392,397 ****
--- 392,398 ----
NEXT_PASS (pass_loop_init);
NEXT_PASS (pass_lim);
NEXT_PASS (pass_iv_canon);
+ NEXT_PASS (pass_record_bounds);
NEXT_PASS (pass_if_conversion);
NEXT_PASS (pass_vectorize);
NEXT_PASS (pass_linear_transform);
Index: tree-pass.h
===================================================================
RCS file: /cvs/gcc/gcc/gcc/tree-pass.h,v
retrieving revision 2.15
diff -c -3 -p -r2.15 tree-pass.h
*** tree-pass.h 9 Sep 2004 20:53:37 -0000 2.15
--- tree-pass.h 11 Sep 2004 19:44:56 -0000
*************** extern struct tree_opt_pass pass_loop;
*** 126,131 ****
--- 126,132 ----
extern struct tree_opt_pass pass_loop_init;
extern struct tree_opt_pass pass_lim;
extern struct tree_opt_pass pass_iv_canon;
+ extern struct tree_opt_pass pass_record_bounds;
extern struct tree_opt_pass pass_if_conversion;
extern struct tree_opt_pass pass_vectorize;
extern struct tree_opt_pass pass_complete_unroll;
Index: tree-ssa-loop.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/tree-ssa-loop.c,v
retrieving revision 2.17
diff -c -3 -p -r2.17 tree-ssa-loop.c
*** tree-ssa-loop.c 8 Sep 2004 15:28:56 -0000 2.17
--- tree-ssa-loop.c 11 Sep 2004 19:44:57 -0000
*************** struct tree_opt_pass pass_iv_canon =
*** 263,268 ****
--- 263,297 ----
0 /* letter */
};
+ /* Record bounds on numbers of iterations of loops. */
+
+ static void
+ tree_ssa_loop_bounds (void)
+ {
+ if (!current_loops)
+ return;
+
+ estimate_numbers_of_iterations (current_loops);
+ scev_reset ();
+ }
+
+ struct tree_opt_pass pass_record_bounds =
+ {
+ "bounds", /* name */
+ NULL, /* gate */
+ tree_ssa_loop_bounds, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ 0, /* tv_id */
+ PROP_cfg | PROP_ssa, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ 0, /* todo_flags_finish */
+ 0 /* letter */
+ };
+
/* Complete unrolling of loops. */
static void
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17387
next prev parent reply other threads:[~2004-09-11 19:55 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-09 23:54 [Bug c/17387] New: " hjl at lucon dot org
2004-09-10 0:36 ` [Bug rtl-optimization/17387] " pinskia at gcc dot gnu dot org
2004-09-10 2:50 ` law at gcc dot gnu dot org
2004-09-10 8:05 ` pinskia at gcc dot gnu dot org
2004-09-10 9:53 ` hubicka at gcc dot gnu dot org
2004-09-10 23:22 ` pinskia at gcc dot gnu dot org
2004-09-11 19:55 ` rakdver at gcc dot gnu dot org [this message]
2004-11-27 20:49 ` pinskia at gcc dot gnu dot org
2005-01-23 13:36 ` steven at gcc dot gnu dot org
2005-01-24 18:17 ` hjl at lucon dot org
2005-01-24 18:53 ` pinskia at gcc dot gnu dot org
2005-01-27 1:27 ` steven at gcc dot gnu dot org
2005-01-27 1:36 ` steven at gcc dot gnu dot org
2005-01-27 1:43 ` steven at gcc dot gnu dot org
2005-01-27 4:03 ` hjl at lucon dot org
2005-01-27 6:05 ` rth at gcc dot gnu dot org
2005-01-27 7:14 ` stevenb at suse dot de
2005-01-27 10:14 ` steven at gcc dot gnu dot org
2005-01-27 10:27 ` steven at gcc dot gnu dot org
2005-01-27 10:28 ` steven at gcc dot gnu dot org
2005-01-27 13:36 ` pinskia at gcc dot gnu dot org
2005-09-29 3:44 ` pinskia at gcc dot gnu dot org
[not found] <bug-17387-682@http.gcc.gnu.org/bugzilla/>
2006-01-15 20:30 ` pinskia at gcc dot gnu dot org
2006-02-27 23:55 ` hjl at lucon dot org
2007-04-20 20:58 ` steven at gcc dot gnu dot org
2007-04-20 21:10 ` steven at gcc dot gnu dot org
2007-05-25 20:32 ` steven at gcc dot gnu dot org
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