[Bug tree-optimization/18687] [4.0 Regression] ~50% compile time regression

[Bug tree-optimization/18687] [4.0 Regression] ~50% compile time regression

[belyshev at depni dot sinp dot msu dot ru]

------- Additional Comments From belyshev at depni dot sinp dot msu dot ru  2004-12-22 21:50 -------
Hope these two larger test cases will help profiling.

		3.4.4		4.0.0		delta

hashes100.c:

-O0		 3.7		 3.8		  3%
-O1		 6.4		14.5		126%
-O2		11.3		18.7		 65%
-O3		11.9		19.0		 60%


infcodes100.c:

-O0		 7.4		 7.6		  3%
-O1		12.6		25.4		101%
-O2		21.4		33.8		 58%
-O3		22.4		34.7		 55%


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2004-12-03 00:24:07         |2004-12-22 21:50:22
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687

[Bug tree-optimization/18687] [4.0 Regression] ~50% compile time regression

[steven at gcc dot gnu dot org]

------- Additional Comments From steven at gcc dot gnu dot org  2005-01-28 00:55 -------
Did anyone try to profile these already? 
 

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |stevenb at suse dot de


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687

[Bug tree-optimization/18687] [4.0 Regression] ~50% compile time regression

[steven at gcc dot gnu dot org]

------- Additional Comments From steven at gcc dot gnu dot org  2005-01-30 22:53 -------
Profile for hashes100.c on an x86-64 with "-O2 -m32": 
 
CPU: Hammer, speed 1394.98 MHz (estimated) 
Counted CPU_CLK_UNHALTED events (Cycles outside of halt state) with a unit 
mask of 0x00 (No unit mask) count 4000 
Counted DATA_CACHE_MISSES events (Data cache misses) with a unit mask of 0x00 
(No unit mask) count 1000 
samples  %        samples  %        image name       symbol name 
27235     2.3397  158       0.5518  cc1              constrain_operands 
21936     1.8845  53        0.1851  cc1              record_reg_classes 
21735     1.8672  399       1.3936  cc1              reg_scan_mark_refs 
20966     1.8012  1179      4.1179  libc.so.6        __GI_memset 
20786     1.7857  418       1.4600  cc1              ggc_alloc_stat 
20199     1.7353  168       0.5868  cc1              fold 
18374     1.5785  589       2.0572  libc.so.6        _int_malloc 
16467     1.4147  177       0.6182  cc1              iterative_hash_expr 
15562     1.3369  324       1.1316  cc1              htab_find_slot_with_hash 
15080     1.2955  842       2.9409  cc1              note_stores 
13709     1.1777  78        0.2724  cc1              find_reloads 
13054     1.1214  45        0.1572  cc1              nonzero_bits1 
12297     1.0564  84        0.2934  cc1              mark_used_regs 
11402     0.9795  68        0.2375  cc1              refers_to_regno_p 
11335     0.9738  95        0.3318  cc1              cse_insn 
11088     0.9526  71        0.2480  cc1              ix86_decompose_address 
10401     0.8935  70        0.2445  cc1              for_each_rtx_1 
9731      0.8360  354       1.2364  cc1              count_reg_usage 
9176      0.7883  202       0.7055  cc1              bitmap_set_bit 
8578      0.7369  284       0.9919  cc1              bitmap_bit_p 
8137      0.6990  208       0.7265  cc1              extract_insn 
8019      0.6889  30        0.1048  cc1             
reload_cse_simplify_operands 
7755      0.6662  541       1.8896  cc1              pool_alloc 
7341      0.6307  143       0.4995  cc1              et_splay 
6992      0.6007  319       1.1142  cc1              init_alias_analysis 
 
 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687

[Bug tree-optimization/18687] [4.0 Regression] ~50% compile time regression

[steven at gcc dot gnu dot org]

------- Additional Comments From steven at gcc dot gnu dot org  2005-01-30 22:55 -------
The profile for infcodes100.c is essentially the same. 
 

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687

[Bug tree-optimization/18687] [4.0 Regression] ~50% compile time regression

[steven at gcc dot gnu dot org]

------- Additional Comments From steven at gcc dot gnu dot org  2005-01-30 23:42 -------
IVopts takes a lot of time (in several runs): 
 tree iv optimization  :   1.12 ( 9%) usr   0.16 (23%) sys   1.34 (10%) wall 
 

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687

[Bug tree-optimization/18687] [4.0 Regression] ~50% compile time regression

[rakdver at gcc dot gnu dot org]

------- Additional Comments From rakdver at gcc dot gnu dot org  2005-02-08 00:29 -------
Out of the time spent in ivopts:

-- this patch saves some 25%:
   http://gcc.gnu.org/ml/gcc-patches/2004-10/msg00136.html

-- another 25% are caused by inefficient use of # of iterations analysis;
   I am thinking about solution

-- yet another 25% are spent in scalar evolutions analysis; I am working on
   speeding this up

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687

[Bug tree-optimization/18687] [4.0 Regression] ~50% compile time regression

[rakdver at gcc dot gnu dot org]

------- Additional Comments From rakdver at gcc dot gnu dot org  2005-02-08 16:43 -------
Patch (improving ivopts performance on the testcase by some 40%):

http://gcc.gnu.org/ml/gcc-patches/2005-02/msg00307.html

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687

[Bug tree-optimization/18687] [4.0 Regression] ~50% compile time regression

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2005-02-10 00:33 -------
Subject: Bug 18687

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	rakdver@gcc.gnu.org	2005-02-10 00:32:49

Modified files:
	gcc            : ChangeLog tree-flow.h tree-ssa-loop-ivcanon.c 
	                 tree-ssa-loop-ivopts.c tree-ssa-loop-niter.c 
	                 tree.c tree.h 

Log message:
	PR tree-optimization/18687
	* tree-flow.h (find_loop_niter): Declare.
	* tree-ssa-loop-ivcanon.c (canonicalize_loop_induction_variables):
	Try using scev even for loops with more than one exit.
	* tree-ssa-loop-ivopts.c (struct loop_data): Removed niter field.
	(struct ivopts_data): Added niters field.
	(struct nfe_cache_elt): New.
	(nfe_hash, nfe_eq, niter_for_exit, niter_for_single_dom_exit): New
	functions.
	(tree_ssa_iv_optimize_init): Initialize niters cache.
	(determine_number_of_iterations): Removed.
	(find_induction_variables): Do not call determine_number_of_iterations.
	Access niters for single exit through niter_for_single_dom_exit.
	(add_iv_outer_candidates): Access niters for single exit through
	niter_for_single_dom_exit.
	(may_eliminate_iv): Take data argument.  Use niter_for_exit.  Do not use
	number_of_iterations_cond.
	(iv_period): New function.
	(determine_use_iv_cost_condition): Pass data to may_eliminate_iv.
	(may_replace_final_value): Take data argument.  Use
	niter_for_single_dom_exit.
	(determine_use_iv_cost_outer): Pass data to may_replace_final_value.
	(rewrite_use_compare): Pass data to may_eliminate_iv.
	(rewrite_use_outer): Pass data to may_replace_final_value.
	(free_loop_data): Clean up the niters cache.
	(tree_ssa_iv_optimize_finalize): Free the niters cache.
	(tree_ssa_iv_optimize_loop): Do not call loop_commit_inserts.
	* tree-ssa-loop-niter.c (find_loop_niter): New function.
	(find_loop_niter_by_eval): Use tree_int_cst_lt.
	(num_ending_zeros): Moved to tree.c.
	* tree.h (num_ending_zeros): Declare.
	* tree.c (num_ending_zeros): Moved from tree.c.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.7427&r2=2.7428
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-flow.h.diff?cvsroot=gcc&r1=2.80&r2=2.81
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-ssa-loop-ivcanon.c.diff?cvsroot=gcc&r1=2.5&r2=2.6
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-ssa-loop-ivopts.c.diff?cvsroot=gcc&r1=2.44&r2=2.45
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-ssa-loop-niter.c.diff?cvsroot=gcc&r1=2.18&r2=2.19
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree.c.diff?cvsroot=gcc&r1=1.463&r2=1.464
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree.h.diff?cvsroot=gcc&r1=1.687&r2=1.688



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687

[Bug tree-optimization/18687] [4.0 Regression] ~50% compile time regression

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-02-10 00:51 -------
(In reply to comment #22)
So does someone do more testings again?

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687

[Bug tree-optimization/18687] [4.0 Regression] ~50% compile time regression

[belyshev at depni dot sinp dot msu dot ru]

------- Additional Comments From belyshev at depni dot sinp dot msu dot ru  2005-02-10 15:55 -------
                3.4.4           4.0.0           delta

hashes100.c:

-O0              3.66            3.81             4%
-O1              6.43           11.47            78%
-O2             11.40           17.89            57%
-O3             12.00           18.35            53%


infcodes100.c:

-O0              7.24            7.66             6%
-O1             12.43           22.24            79%
-O2             21.28           31.54            48%
-O3             22.37           32.02            43%


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|patch                       |
      Known to fail|                            |4.0.0
      Known to work|                            |3.4.4
   Last reconfirmed|2004-12-22 21:50:22         |2005-02-10 15:55:22
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687

[Bug tree-optimization/18687] [4.0/4.1 Regression] ~50% compile time regression

[mmitchel at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.0.0                       |4.0.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687

[Bug tree-optimization/18687] [4.0/4.1 Regression] ~50% compile time regression

[mmitchel at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.0.1                       |4.0.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687

[Bug tree-optimization/18687] [4.0/4.1 Regression] ~50% compile time regression

[bonzini at gcc dot gnu dot org]

------- Additional Comments From bonzini at gcc dot gnu dot org  2005-08-17 13:06 -------
what about times on 4.1?

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687

[Bug tree-optimization/18687] [4.0/4.1 Regression] ~50% compile time regression

[belyshev at depni dot sinp dot msu dot ru]

------- Additional Comments From belyshev at depni dot sinp dot msu dot ru  2005-08-17 16:10 -------
        3.4.5   4.0.2   4.1.0           3.4->4.0 (%)    4.0->4.1 (%)

hashes100.c:

O0      1.56    1.59    1.57            2.2            -1.4
O1      2.54    4.23    4.49           66.              6.1
O2      4.43    6.29    6.56           42.              4.4
O3      4.74    6.33    6.66           34.              5.1

infcodes100.c:

O0      3.21    3.69    3.67           15.             -0.64
O1      4.68    7.06    7.72           51.              9.3
O2      8.01    9.84   10.86           23.             10.
O3      8.45    9.94   10.95           18.             10.


Note this is a different machine than in my previous comments (2GHz k8 with
1024K of L2 cache in 64bit mode, previous was 1GHz k7 with 64K of L2).


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687

[Bug tree-optimization/18687] [4.0/4.1 Regression] ~50% compile time regression

[mmitchel at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.0.2                       |4.0.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687

[Bug tree-optimization/18687] [4.0/4.1 Regression] ~50% compile time regression

[mmitchel at gcc dot gnu dot org]

------- Comment #27 from mmitchel at gcc dot gnu dot org  2005-10-31 01:59 -------
I'm going to mark as P4.  I'd like to see it fixed, but I'm not sure there's
much we can do for 4.1.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687