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* [Bug rtl-optimization/67864] [6 Regression] CSiBE size regression
2015-10-06 10:30 [Bug rtl-optimization/67864] New: [6 Regression] CSiBE size regression rguenth at gcc dot gnu.org
@ 2015-10-06 10:30 ` rguenth at gcc dot gnu.org
2015-10-11 9:03 ` segher at gcc dot gnu.org
2015-10-12 8:14 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-10-06 10:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67864
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |6.0
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug rtl-optimization/67864] New: [6 Regression] CSiBE size regression
@ 2015-10-06 10:30 rguenth at gcc dot gnu.org
2015-10-06 10:30 ` [Bug rtl-optimization/67864] " rguenth at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-10-06 10:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67864
Bug ID: 67864
Summary: [6 Regression] CSiBE size regression
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
CC: segher at kernel dot crashing.org
Target Milestone: ---
http://gcc.opensuse.org/CSiBE/ shows a big size regression between r228310
(good)
and r228359 (bad). Flags used are -Os -fgnu89-inline, suspect is
+2015-10-01 Segher Boessenkool <segher@kernel.crashing.org>
+
+ * bb-reorder.c (reorder_basic_blocks): Use the algorithm selected
+ with flag_reorder_blocks_algorithm.
+ * common.opt (freorder-blocks-algorithm=): New flag.
+ (reorder_blocks_algorithm): New enum.
+ * flag-types.h (reorder_blocks_algorithm): New enum.
+ * opts.c (default_options_table): Use -freorder-blocks at -O1 and up,
+ and -freorder-blocks-algorithm=stc at -O2 and up (not at -Os).
The size regression is from 3562398 bytes to 3617915 bytes.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug rtl-optimization/67864] [6 Regression] CSiBE size regression
2015-10-06 10:30 [Bug rtl-optimization/67864] New: [6 Regression] CSiBE size regression rguenth at gcc dot gnu.org
2015-10-06 10:30 ` [Bug rtl-optimization/67864] " rguenth at gcc dot gnu.org
@ 2015-10-11 9:03 ` segher at gcc dot gnu.org
2015-10-12 8:14 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: segher at gcc dot gnu.org @ 2015-10-11 9:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67864
--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Sun Oct 11 09:03:09 2015
New Revision: 228692
URL: https://gcc.gnu.org/viewcvs?rev=228692&root=gcc&view=rev
Log:
bb-reorder: Improve the simple algorithm for -Os (PR67864)
As the PR points out, the "simple" reorder algorithm makes bigger code
than the STC algorithm did, for -Os, for x86. I now tested it for many
different targets and it turns out to be worse everywhere.
This simple patch tunes "simple" a bit; this makes it better than STC
almost everywhere. The only exceptions (for the targets where I have
results) are x86 and mn10300. For those targets it may be best to switch
the default algorithm for -Os to STC.
2015-10-11 Segher Boessenkool <segher@kernel.crashing.org>
PR rtl-optimization/67864
* gcc/bb-reorder (reorder_basic_blocks_simple): Prefer existing
fallthrough edges for conditional jumps. Don't sort candidate
edges if not optimizing for speed.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/bb-reorder.c
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug rtl-optimization/67864] [6 Regression] CSiBE size regression
2015-10-06 10:30 [Bug rtl-optimization/67864] New: [6 Regression] CSiBE size regression rguenth at gcc dot gnu.org
2015-10-06 10:30 ` [Bug rtl-optimization/67864] " rguenth at gcc dot gnu.org
2015-10-11 9:03 ` segher at gcc dot gnu.org
@ 2015-10-12 8:14 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-10-12 8:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67864
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
No difference for x86 (but that may have been expected)
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2015-10-12 8:14 UTC | newest]
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2015-10-06 10:30 [Bug rtl-optimization/67864] New: [6 Regression] CSiBE size regression rguenth at gcc dot gnu.org
2015-10-06 10:30 ` [Bug rtl-optimization/67864] " rguenth at gcc dot gnu.org
2015-10-11 9:03 ` segher at gcc dot gnu.org
2015-10-12 8:14 ` rguenth at gcc dot gnu.org
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