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* [Bug tree-optimization/109605] New: -fno-tree-vectorize does not disable vectorizer
@ 2023-04-24 9:53 hubicka at gcc dot gnu.org
2023-04-24 10:30 ` [Bug driver/109605] " rguenth at gcc dot gnu.org
2023-05-17 18:08 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: hubicka at gcc dot gnu.org @ 2023-04-24 9:53 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109605
Bug ID: 109605
Summary: -fno-tree-vectorize does not disable vectorizer
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: hubicka at gcc dot gnu.org
Target Milestone: ---
-ftree-vectorize enables -ftree-slp-vectorize and -ftree-loop-vectorize however
-fno-tree-vectorize does not disable them. This is quite counter-intuitive and
at least I got caught in this trap while doing some benchmarking.
^ permalink raw reply [flat|nested] 3+ messages in thread* [Bug driver/109605] -fno-tree-vectorize does not disable vectorizer 2023-04-24 9:53 [Bug tree-optimization/109605] New: -fno-tree-vectorize does not disable vectorizer hubicka at gcc dot gnu.org @ 2023-04-24 10:30 ` rguenth at gcc dot gnu.org 2023-05-17 18:08 ` pinskia at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: rguenth at gcc dot gnu.org @ 2023-04-24 10:30 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109605 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|tree-optimization |driver --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- You mean -ftree-slp-vectorize -fno-tree-vectorize doesn't disable SLP vectorization? I suspect this is since we use EnabledBy() which doesn't seem to imply a DisabledBy() of the negative form(?). ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug driver/109605] -fno-tree-vectorize does not disable vectorizer 2023-04-24 9:53 [Bug tree-optimization/109605] New: -fno-tree-vectorize does not disable vectorizer hubicka at gcc dot gnu.org 2023-04-24 10:30 ` [Bug driver/109605] " rguenth at gcc dot gnu.org @ 2023-05-17 18:08 ` pinskia at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-05-17 18:08 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109605 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2023-05-17 Ever confirmed|0 |1 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Confirmed. Take a simple LP64 testcase (just to make the aliasing happy): ``` int f1(long long *a, long *b, long *c) { long a0, a1; a[0] = b[0] + c[0]; a[1] = b[1] + c[1]; } ``` At `-O2`, SLP vectorizers it. `-O2 -fno-tree-vectorize` disables the SLP vectorizer But if you did: `-O2 -ftree-slp-vectorize -fno-tree-vectorize` the SLP vectorizer is turned on still. This is what is definitely counter-intuitive really. ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-05-17 18:08 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-04-24 9:53 [Bug tree-optimization/109605] New: -fno-tree-vectorize does not disable vectorizer hubicka at gcc dot gnu.org 2023-04-24 10:30 ` [Bug driver/109605] " rguenth at gcc dot gnu.org 2023-05-17 18:08 ` pinskia at gcc dot gnu.org
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