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Reload this Page could optimize FP multiplies better

 
 
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Old 01-05-2012, 10:06 PM
"pinskia at gcc dot gnu.org"
 
Default could optimize FP multiplies better
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18589

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2005-12-21 03:49:53 |2012-01-04

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-01-05 23:06:56 UTC ---
The tree level on the trunk we get:
powmult.2_10 = foo_1(D) * foo_1(D);
D.1709_4 = bar_3(D) * bar_3(D);
D.1710_5 = D.1709_4 * bar_3(D);
D.1711_6 = D.1710_5 * bar_3(D);
powmult.2_9 = D.1711_6 * powmult.2_10;
D.1707_7 = powmult.2_9 * powmult.2_10;
--- CUT ---
which is just as bad.

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Old 01-09-2012, 11:20 AM
"rguenth at gcc dot gnu.org"
 
Default could optimize FP multiplies better
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18589

Richard Guenther <rguenth at gcc dot gnu.org> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org,
| |wschmidt at gcc dot gnu.org

--- Comment #6 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-09 12:20:31 UTC ---
Yeah, reassoc does not canonicalize to pow () so the tree level optimal
expansion does not trigger [in reality reassoc should probably do both
on-the-fly - linearly expand existing pow()s to expose them to multiply
chains and sorting, combine them back and then emit them in optimal form].

Bill, something you want to tackle?

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Old 01-09-2012, 12:06 PM
"wschmidt at gcc dot gnu.org"
 
Default could optimize FP multiplies better
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18589

--- Comment #7 from William J. Schmidt <wschmidt at gcc dot gnu.org> 2012-01-09 13:06:34 UTC ---
Sure, I'll at least have a look at it when I get some time.

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Old 01-13-2012, 09:27 PM
"wschmidt at gcc dot gnu.org"
 
Default could optimize FP multiplies better
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18589

William J. Schmidt <wschmidt at gcc dot gnu.org> changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
AssignedTo|unassigned at gcc dot |wschmidt at gcc dot gnu.org
|gnu.org |
Target Milestone|--- |4.8.0

--- Comment #8 from William J. Schmidt <wschmidt at gcc dot gnu.org> 2012-01-13 22:27:48 UTC ---
I've started to look at this -- I'll plan to get a patch in place for 4.8.

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Old 04-12-2012, 04:15 PM
"wschmidt at gcc dot gnu.org"
 
Default could optimize FP multiplies better
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18589

--- Comment #9 from William J. Schmidt <wschmidt at gcc dot gnu.org> 2012-04-12 16:15:24 UTC ---
Author: wschmidt
Date: Thu Apr 12 16:15:13 2012
New Revision: 186384

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186384
Log:
gcc:

2012-04-12 Bill Schmidt <wschmidt@linux.vnet.ibm.com>

PR tree-optimization/18589
* tree-ssa-reassoc.c (reassociate_stats): Add two fields.
(operand_entry): Add count field.
(add_repeat_to_ops_vec): New function.
(completely_remove_stmt): Likewise.
(remove_def_if_absorbed_call): Likewise.
(remove_visited_stmt_chain): Remove feeding builtin pow/powi calls.
(acceptable_pow_call): New function.
(linearize_expr_tree): Look for builtin pow/powi calls and add operand
entries with repeat counts when found.
(repeat_factor_d): New struct and associated typedefs.
(repeat_factor_vec): New static vector variable.
(compare_repeat_factors): New function.
(get_reassoc_pow_ssa_name): Likewise.
(attempt_builtin_powi): Likewise.
(reassociate_bb): Call attempt_builtin_powi.
(fini_reassoc): Two new calls to statistics_counter_event.

gcc/testsuite:

2012-04-12 Bill Schmidt <wschmidt@linux.vnet.ibm.com>

PR tree-optimization/18589
* gcc.dg/tree-ssa/pr18589-1.c: New test.
* gcc.dg/tree-ssa/pr18589-2.c: Likewise.
* gcc.dg/tree-ssa/pr18589-3.c: Likewise.
* gcc.dg/tree-ssa/pr18589-4.c: Likewise.
* gcc.dg/tree-ssa/pr18589-5.c: Likewise.
* gcc.dg/tree-ssa/pr18589-6.c: Likewise.
* gcc.dg/tree-ssa/pr18589-7.c: Likewise.
* gcc.dg/tree-ssa/pr18589-8.c: Likewise.
* gcc.dg/tree-ssa/pr18589-9.c: Likewise.
* gcc.dg/tree-ssa/pr18589-10.c: Likewise.



Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr18589-1.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr18589-10.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr18589-2.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr18589-3.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr18589-4.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr18589-5.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr18589-6.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr18589-7.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr18589-8.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr18589-9.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-reassoc.c

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Old 04-12-2012, 04:16 PM
"wschmidt at gcc dot gnu.org"
 
Default could optimize FP multiplies better
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18589

William J. Schmidt <wschmidt at gcc dot gnu.org> changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED

--- Comment #10 from William J. Schmidt <wschmidt at gcc dot gnu.org> 2012-04-12 16:16:50 UTC ---
Fixed.

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