public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug tree-optimization/67800] New: [6 Regression] Missed vectorization opportunity on x86
@ 2015-10-01 15:48 afomin.mailbox at gmail dot com
2015-10-01 16:17 ` [Bug tree-optimization/67800] " afomin.mailbox at gmail dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: afomin.mailbox at gmail dot com @ 2015-10-01 15:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67800
Bug ID: 67800
Summary: [6 Regression] Missed vectorization opportunity on x86
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: afomin.mailbox at gmail dot com
CC: izamyatin at gmail dot com, rguenth at gcc dot gnu.org,
ysrumyan at gmail dot com
Target Milestone: ---
Target: i686-*-*
Created attachment 36434
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36434&action=edit
A reproducer
A loop in the test attached compiled with -m32 -msse4.2 -O2 -ftree-vectorize
-fPIE -pie -c is no more vectorized after r223525 (while on r223524 everything
is OK) because of strange DOT_PROD_EXPR recognition (see below).
vect_is_simple_use: operand _15
def_stmt: _15 = _14 * 76;
type of def: internal
vect_recog_dot_prod_pattern: detected: patt_47 = DOT_PROD_EXPR <_2, 76, _17>;
pattern recognized: patt_47 = DOT_PROD_EXPR <_2, 76, _17>;
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/67800] [6 Regression] Missed vectorization opportunity on x86
2015-10-01 15:48 [Bug tree-optimization/67800] New: [6 Regression] Missed vectorization opportunity on x86 afomin.mailbox at gmail dot com
@ 2015-10-01 16:17 ` afomin.mailbox at gmail dot com
2015-10-02 9:33 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: afomin.mailbox at gmail dot com @ 2015-10-01 16:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67800
--- Comment #1 from Alexander Fomin <afomin.mailbox at gmail dot com> ---
Nota bene: -fPIE -pie options can be ommited.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/67800] [6 Regression] Missed vectorization opportunity on x86
2015-10-01 15:48 [Bug tree-optimization/67800] New: [6 Regression] Missed vectorization opportunity on x86 afomin.mailbox at gmail dot com
2015-10-01 16:17 ` [Bug tree-optimization/67800] " afomin.mailbox at gmail dot com
@ 2015-10-02 9:33 ` rguenth at gcc dot gnu.org
2015-10-29 8:35 ` izamyatin at gmail dot com
2015-10-29 9:54 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-10-02 9:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67800
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2015-10-02
Blocks| |53947
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Target Milestone|--- |6.0
Ever confirmed|0 |1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine. I think this particular issue was also noticed in another bug.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/67800] [6 Regression] Missed vectorization opportunity on x86
2015-10-01 15:48 [Bug tree-optimization/67800] New: [6 Regression] Missed vectorization opportunity on x86 afomin.mailbox at gmail dot com
2015-10-01 16:17 ` [Bug tree-optimization/67800] " afomin.mailbox at gmail dot com
2015-10-02 9:33 ` rguenth at gcc dot gnu.org
@ 2015-10-29 8:35 ` izamyatin at gmail dot com
2015-10-29 9:54 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: izamyatin at gmail dot com @ 2015-10-29 8:35 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67800
--- Comment #3 from Igor Zamyatin <izamyatin at gmail dot com> ---
Richard, do you have any plans regarding this?
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/67800] [6 Regression] Missed vectorization opportunity on x86
2015-10-01 15:48 [Bug tree-optimization/67800] New: [6 Regression] Missed vectorization opportunity on x86 afomin.mailbox at gmail dot com
` (2 preceding siblings ...)
2015-10-29 8:35 ` izamyatin at gmail dot com
@ 2015-10-29 9:54 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-10-29 9:54 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67800
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Depends on| |67612
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
The other bug was PR67612. I have a half-way started DOT_PPROD (and SAD_EXPR)
support in vectorizable_conversion but it's not trivial as it doesn't fit there
very. I've got distracted meanwhile.
A way to fix the regressions (but not PR67612) is to revert the reduction
check parts of
2015-05-22 Richard Biener <rguenther@suse.de>
* tree-vect-patterns.c (vect_recog_dot_prod_pattern): Replace
assert with guard, remove check on detected reduction.
(vect_recog_sad_pattern): Likewise.
(vect_recog_widen_sum_pattern): Likewise.
which was preparation for BB vectorization support for reductions (which
I didn't get to finish).
But I'd rather have non-reduction support for DOT_PROD and SAD_EXPR and hope
to get to that during stage3.
If you can beat me to it more power to you ;)
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67612
[Bug 67612] Unable to vectorize DOT_PROD_EXPR (PMADDWD?)
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2015-10-29 9:54 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-10-01 15:48 [Bug tree-optimization/67800] New: [6 Regression] Missed vectorization opportunity on x86 afomin.mailbox at gmail dot com
2015-10-01 16:17 ` [Bug tree-optimization/67800] " afomin.mailbox at gmail dot com
2015-10-02 9:33 ` rguenth at gcc dot gnu.org
2015-10-29 8:35 ` izamyatin at gmail dot com
2015-10-29 9:54 ` rguenth at gcc dot gnu.org
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).