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* [Bug c++/104105] New: Unused nothrow new not optimized
@ 2022-01-18 21:13 denis.campredon at gmail dot com
2022-01-18 23:36 ` [Bug c++/104105] " pinskia at gcc dot gnu.org
2022-01-19 10:28 ` rguenth at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: denis.campredon at gmail dot com @ 2022-01-18 21:13 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104105
Bug ID: 104105
Summary: Unused nothrow new not optimized
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: denis.campredon at gmail dot com
Target Milestone: ---
g++ can remove new calls when the result is unused, but fails to di the same
with nothrow new calls. f() could be compiled to an empty function with
optimisations on.
------------
void f() {
new (std::nothrow) int(5);
new (std::nothrow) int[5];
}
------------
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/104105] Unused nothrow new not optimized
2022-01-18 21:13 [Bug c++/104105] New: Unused nothrow new not optimized denis.campredon at gmail dot com
@ 2022-01-18 23:36 ` pinskia at gcc dot gnu.org
2022-01-19 10:28 ` rguenth at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-01-18 23:36 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104105
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/104105] Unused nothrow new not optimized
2022-01-18 21:13 [Bug c++/104105] New: Unused nothrow new not optimized denis.campredon at gmail dot com
2022-01-18 23:36 ` [Bug c++/104105] " pinskia at gcc dot gnu.org
@ 2022-01-19 10:28 ` rguenth at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-01-19 10:28 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104105
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
Last reconfirmed| |2022-01-19
Status|UNCONFIRMED |NEW
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. We're keying on DECL_IS_REPLACEABLE_OPERATOR_NEW_P which it seems
the
std::nothrow variant is not. There's also valid_new_delete_pair_p for
eliding pairs of new/delete if otherwise unused, the nothrow variants do
seem to be handled there.
The std::nothrow variant is DECL_IS_OPERATOR_NEW_P but it's not marked
replaceable.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-01-19 10:28 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2022-01-18 21:13 [Bug c++/104105] New: Unused nothrow new not optimized denis.campredon at gmail dot com
2022-01-18 23:36 ` [Bug c++/104105] " pinskia at gcc dot gnu.org
2022-01-19 10:28 ` rguenth at gcc dot gnu.org
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