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* [Bug rtl-optimization/54751] New: [4.8 Regression] slow compile time with rtl loop unroller
@ 2012-09-29 13:02 Joost.VandeVondele at mat dot ethz.ch
2012-10-01 10:15 ` [Bug rtl-optimization/54751] " rguenth at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: Joost.VandeVondele at mat dot ethz.ch @ 2012-09-29 13:02 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54751
Bug #: 54751
Summary: [4.8 Regression] slow compile time with rtl loop
unroller
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: Joost.VandeVondele@mat.ethz.ch
Created attachment 28299
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28299
gzipped testcase.
compiling the attached testcase need ~10x more time with current 4.8 trunk than
with 4.7. I believe this is a recent regression.
A typical stack trace looks like
#0 0x00000000006a7a02 in df_ref_equal_p(df_ref_d*, df_ref_d*) ()
#1 0x00000000006a7af5 in df_refs_verify(vec_t<df_ref_d*>*, df_ref_d**, bool)
()
#2 0x00000000006abf3f in df_insn_refs_verify(df_collection_rec*,
basic_block_def*, rtx_def*, bool) ()
#3 0x00000000006aea2a in df_bb_verify(basic_block_def*) ()
#4 0x00000000006aed40 in df_scan_verify() ()
#5 0x000000000069e155 in df_analyze() ()
#6 0x000000000083b1dd in iv_analysis_loop_init(loop*) ()
#7 0x000000000083e685 in get_simple_loop_desc(loop*) ()
#8 0x0000000000841265 in unroll_and_peel_loops(int) ()
#9 0x0000000000835cd7 in rtl_unroll_and_peel_loops() ()
#10 0x0000000000881107 in execute_one_pass(opt_pass*) ()
compile flags:
gfortran -c -cpp -O2 -ftree-vectorize -funroll-loops -ffast-math test.f90
(needs about 10min (gcc 4.8) or 1min (gcc 4.7) on my machine, removing
-funroll-loops reduces that to 1m20s (4.8) or 28s (4.7))
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/54751] [4.8 Regression] slow compile time with rtl loop unroller
2012-09-29 13:02 [Bug rtl-optimization/54751] New: [4.8 Regression] slow compile time with rtl loop unroller Joost.VandeVondele at mat dot ethz.ch
@ 2012-10-01 10:15 ` rguenth at gcc dot gnu.org
2012-10-01 20:40 ` steven at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-10-01 10:15 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54751
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |compile-time-hog
Target Milestone|--- |4.8.0
--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-10-01 10:15:13 UTC ---
I suspect we vectorize much more in 4.8? Otherwise GCC 4.8 should have
improved this bottleneck (by generating/unrolling less loops, not by
making unrolling faster).
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/54751] [4.8 Regression] slow compile time with rtl loop unroller
2012-09-29 13:02 [Bug rtl-optimization/54751] New: [4.8 Regression] slow compile time with rtl loop unroller Joost.VandeVondele at mat dot ethz.ch
2012-10-01 10:15 ` [Bug rtl-optimization/54751] " rguenth at gcc dot gnu.org
@ 2012-10-01 20:40 ` steven at gcc dot gnu.org
2012-10-02 9:55 ` rguenth at gcc dot gnu.org
2012-10-02 10:39 ` Joost.VandeVondele at mat dot ethz.ch
3 siblings, 0 replies; 5+ messages in thread
From: steven at gcc dot gnu.org @ 2012-10-01 20:40 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54751
Steven Bosscher <steven at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2012-10-01
Ever Confirmed|0 |1
--- Comment #2 from Steven Bosscher <steven at gcc dot gnu.org> 2012-10-01 20:39:41 UTC ---
df_bb_verify?! That means that somehow DF checking is running. Why?
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/54751] [4.8 Regression] slow compile time with rtl loop unroller
2012-09-29 13:02 [Bug rtl-optimization/54751] New: [4.8 Regression] slow compile time with rtl loop unroller Joost.VandeVondele at mat dot ethz.ch
2012-10-01 10:15 ` [Bug rtl-optimization/54751] " rguenth at gcc dot gnu.org
2012-10-01 20:40 ` steven at gcc dot gnu.org
@ 2012-10-02 9:55 ` rguenth at gcc dot gnu.org
2012-10-02 10:39 ` Joost.VandeVondele at mat dot ethz.ch
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-10-02 9:55 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54751
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |INVALID
--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-10-02 09:55:13 UTC ---
Err, yes - please check with --enable-checking=release!
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/54751] [4.8 Regression] slow compile time with rtl loop unroller
2012-09-29 13:02 [Bug rtl-optimization/54751] New: [4.8 Regression] slow compile time with rtl loop unroller Joost.VandeVondele at mat dot ethz.ch
` (2 preceding siblings ...)
2012-10-02 9:55 ` rguenth at gcc dot gnu.org
@ 2012-10-02 10:39 ` Joost.VandeVondele at mat dot ethz.ch
3 siblings, 0 replies; 5+ messages in thread
From: Joost.VandeVondele at mat dot ethz.ch @ 2012-10-02 10:39 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54751
--- Comment #4 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> 2012-10-02 10:39:41 UTC ---
More reasonable with -enable-checking=release
4.8(checking=yes): ~10min
4.8(checking=release): 1min28s.
4.7 : 0min58s
maybe some of the checking is a bit excessive in this case.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2012-10-02 10:39 UTC | newest]
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2012-09-29 13:02 [Bug rtl-optimization/54751] New: [4.8 Regression] slow compile time with rtl loop unroller Joost.VandeVondele at mat dot ethz.ch
2012-10-01 10:15 ` [Bug rtl-optimization/54751] " rguenth at gcc dot gnu.org
2012-10-01 20:40 ` steven at gcc dot gnu.org
2012-10-02 9:55 ` rguenth at gcc dot gnu.org
2012-10-02 10:39 ` Joost.VandeVondele at mat dot ethz.ch
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