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* [Bug c/104120] New: slow compilation with only "-g3 -O1"; other opt levels are fine
@ 2022-01-19 15:23 cnsun at uwaterloo dot ca
2022-01-19 16:00 ` [Bug c/104120] [10/11/12 Regression] slow compilation with only "-g3 -O1"; other opt levels are fine since r10-15-gf179b64e3ab013ff marxin at gcc dot gnu.org
` (6 more replies)
0 siblings, 7 replies; 8+ messages in thread
From: cnsun at uwaterloo dot ca @ 2022-01-19 15:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104120
Bug ID: 104120
Summary: slow compilation with only "-g3 -O1"; other opt levels
are fine
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: cnsun at uwaterloo dot ca
Target Milestone: ---
$ cat t.c
void acc_routine(void) {
int i, j, k, sum, diff;
for (i = 0; i < 10; i++)
for (j = 0; j < 10; j++)
for (k = 0; k < 10; k++)
sum = 1;
for (i = 0; i < 10; i++)
for (j = 0; j < 10; j++)
for (k = 0; k < 10; k++)
sum = 1;
for (i = 0; i < 10; i++)
for (j = 0; j < 10; j++)
for (k = 0; k < 10; k++)
sum = 1;
for (i = 0; i < 10; i++)
for (j = 0; j < 10; j++)
for (k = 0; k < 10; k++)
sum = 1;
for (i = 0; i < 10; i++)
for (j = 0; j < 10; j++)
for (k = 0; k < 10; k++)
sum = 1;
}
$
$ time gcc-trunk -c -g3 t.c -O1
real 0m43.205s
user 0m43.137s
sys 0m0.054s
$
$ time gcc-trunk -c -g3 t.c -O0
real 0m0.034s
user 0m0.022s
sys 0m0.012s
$ time gcc-trunk -c t.c -O1
real 0m0.043s
user 0m0.037s
sys 0m0.006s
$
$ time gcc-trunk -c t.c -O2
real 0m0.033s
user 0m0.027s
sys 0m0.007s
$ time gcc-trunk -c t.c -O3
real 0m0.032s
user 0m0.017s
sys 0m0.015s
$
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/scratch/software/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/12.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /tmp/tmp.2nPqmFoxaU-gcc-builder/gcc/configure
--enable-languages=c,c++,lto --enable-checking-yes --enable-multiarch
--prefix=/scratch/software/gcc-trunk --disable-bootstrap
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.1 20220119 (experimental) [master -g1ead972ce] (GCC)
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c/104120] [10/11/12 Regression] slow compilation with only "-g3 -O1"; other opt levels are fine since r10-15-gf179b64e3ab013ff
2022-01-19 15:23 [Bug c/104120] New: slow compilation with only "-g3 -O1"; other opt levels are fine cnsun at uwaterloo dot ca
@ 2022-01-19 16:00 ` marxin at gcc dot gnu.org
2022-01-20 2:04 ` [Bug debug/104120] " pinskia at gcc dot gnu.org
` (5 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: marxin at gcc dot gnu.org @ 2022-01-19 16:00 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104120
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Summary|slow compilation with only |[10/11/12 Regression] slow
|"-g3 -O1"; other opt levels |compilation with only "-g3
|are fine |-O1"; other opt levels are
| |fine since
| |r10-15-gf179b64e3ab013ff
Last reconfirmed| |2022-01-19
CC| |jakub at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
Status|UNCONFIRMED |NEW
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r10-15-gf179b64e3ab013ff.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug debug/104120] [10/11/12 Regression] slow compilation with only "-g3 -O1"; other opt levels are fine since r10-15-gf179b64e3ab013ff
2022-01-19 15:23 [Bug c/104120] New: slow compilation with only "-g3 -O1"; other opt levels are fine cnsun at uwaterloo dot ca
2022-01-19 16:00 ` [Bug c/104120] [10/11/12 Regression] slow compilation with only "-g3 -O1"; other opt levels are fine since r10-15-gf179b64e3ab013ff marxin at gcc dot gnu.org
@ 2022-01-20 2:04 ` pinskia at gcc dot gnu.org
2022-01-20 2:04 ` pinskia at gcc dot gnu.org
` (4 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-01-20 2:04 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104120
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I suspect it is this part which introduced more debug statements which made it
slower:
* c-typeck.c (c_finish_loop): Add COND_LOCUS and INCR_LOCUS arguments,
emit DEBUG_BEGIN_STMTs if needed
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug debug/104120] [10/11/12 Regression] slow compilation with only "-g3 -O1"; other opt levels are fine since r10-15-gf179b64e3ab013ff
2022-01-19 15:23 [Bug c/104120] New: slow compilation with only "-g3 -O1"; other opt levels are fine cnsun at uwaterloo dot ca
2022-01-19 16:00 ` [Bug c/104120] [10/11/12 Regression] slow compilation with only "-g3 -O1"; other opt levels are fine since r10-15-gf179b64e3ab013ff marxin at gcc dot gnu.org
2022-01-20 2:04 ` [Bug debug/104120] " pinskia at gcc dot gnu.org
@ 2022-01-20 2:04 ` pinskia at gcc dot gnu.org
2022-01-20 7:51 ` rguenth at gcc dot gnu.org
` (3 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-01-20 2:04 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104120
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
now I wonder if the C++ front-end emits worse debugging info than the C
front-end too ....
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug debug/104120] [10/11/12 Regression] slow compilation with only "-g3 -O1"; other opt levels are fine since r10-15-gf179b64e3ab013ff
2022-01-19 15:23 [Bug c/104120] New: slow compilation with only "-g3 -O1"; other opt levels are fine cnsun at uwaterloo dot ca
` (2 preceding siblings ...)
2022-01-20 2:04 ` pinskia at gcc dot gnu.org
@ 2022-01-20 7:51 ` rguenth at gcc dot gnu.org
2022-03-09 13:28 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-01-20 7:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104120
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|unknown |11.2.1
CC| |aoliva at gcc dot gnu.org
Target Milestone|--- |10.4
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
With -fno-checking the profile is quite flat but we fully unroll the loops at
-O1, duplicating the debug stmts while with -O2+ CD-DCE simply kills them off.
I suppose -O1 lacks simple empty loop removal capability here.
On a related note we miss removal of consecutive debug stmts that do not add
any information - we end up with
<bb 2> [local count: 975816]:
[t.c:2:3] # DEBUG BEGIN_STMT
[t.c:3:3] # DEBUG BEGIN_STMT
# DEBUG i => 0
[t.c:3:17] # DEBUG BEGIN_STMT
# DEBUG i => 0
# DEBUG j => 0
[t.c:4:19] # DEBUG BEGIN_STMT
# DEBUG j => 0
# DEBUG k => 0
[t.c:5:21] # DEBUG BEGIN_STMT
[t.c:6:13] # DEBUG sum => NULL
# DEBUG k => 0
[t.c:6:9] # DEBUG BEGIN_STMT
[t.c:6:13] # DEBUG sum => 1
[t.c:5:28] # DEBUG BEGIN_STMT
# DEBUG k => 1
[t.c:5:21] # DEBUG BEGIN_STMT
[t.c:6:13] # DEBUG sum => NULL
# DEBUG k => 1
[t.c:6:9] # DEBUG BEGIN_STMT
[t.c:6:13] # DEBUG sum => 1
[t.c:5:28] # DEBUG BEGIN_STMT
# DEBUG k => 2
[t.c:5:21] # DEBUG BEGIN_STMT
[t.c:6:13] # DEBUG sum => NULL
...
I suppose with views we could indeed step through all (non-existant) stmts
but then this support never materialized ...
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug debug/104120] [10/11/12 Regression] slow compilation with only "-g3 -O1"; other opt levels are fine since r10-15-gf179b64e3ab013ff
2022-01-19 15:23 [Bug c/104120] New: slow compilation with only "-g3 -O1"; other opt levels are fine cnsun at uwaterloo dot ca
` (3 preceding siblings ...)
2022-01-20 7:51 ` rguenth at gcc dot gnu.org
@ 2022-03-09 13:28 ` rguenth at gcc dot gnu.org
2022-06-28 10:47 ` [Bug debug/104120] [10/11/12/13 " jakub at gcc dot gnu.org
2023-07-07 10:42 ` [Bug debug/104120] [11/12/13/14 " rguenth at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-03-09 13:28 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104120
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug debug/104120] [10/11/12/13 Regression] slow compilation with only "-g3 -O1"; other opt levels are fine since r10-15-gf179b64e3ab013ff
2022-01-19 15:23 [Bug c/104120] New: slow compilation with only "-g3 -O1"; other opt levels are fine cnsun at uwaterloo dot ca
` (4 preceding siblings ...)
2022-03-09 13:28 ` rguenth at gcc dot gnu.org
@ 2022-06-28 10:47 ` jakub at gcc dot gnu.org
2023-07-07 10:42 ` [Bug debug/104120] [11/12/13/14 " rguenth at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: jakub at gcc dot gnu.org @ 2022-06-28 10:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104120
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|10.4 |10.5
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 10.4 is being released, retargeting bugs to GCC 10.5.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug debug/104120] [11/12/13/14 Regression] slow compilation with only "-g3 -O1"; other opt levels are fine since r10-15-gf179b64e3ab013ff
2022-01-19 15:23 [Bug c/104120] New: slow compilation with only "-g3 -O1"; other opt levels are fine cnsun at uwaterloo dot ca
` (5 preceding siblings ...)
2022-06-28 10:47 ` [Bug debug/104120] [10/11/12/13 " jakub at gcc dot gnu.org
@ 2023-07-07 10:42 ` rguenth at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-07-07 10:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104120
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|10.5 |11.5
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 10 branch is being closed.
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2023-07-07 10:42 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
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2022-01-19 15:23 [Bug c/104120] New: slow compilation with only "-g3 -O1"; other opt levels are fine cnsun at uwaterloo dot ca
2022-01-19 16:00 ` [Bug c/104120] [10/11/12 Regression] slow compilation with only "-g3 -O1"; other opt levels are fine since r10-15-gf179b64e3ab013ff marxin at gcc dot gnu.org
2022-01-20 2:04 ` [Bug debug/104120] " pinskia at gcc dot gnu.org
2022-01-20 2:04 ` pinskia at gcc dot gnu.org
2022-01-20 7:51 ` rguenth at gcc dot gnu.org
2022-03-09 13:28 ` rguenth at gcc dot gnu.org
2022-06-28 10:47 ` [Bug debug/104120] [10/11/12/13 " jakub at gcc dot gnu.org
2023-07-07 10:42 ` [Bug debug/104120] [11/12/13/14 " rguenth at gcc dot gnu.org
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