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* [Bug c++/53294] New: Optimize out some exception code
@ 2012-05-09 10:40 glisse at gcc dot gnu.org
2012-05-09 14:36 ` [Bug c++/53294] " rguenth at gcc dot gnu.org
2021-07-23 0:12 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: glisse at gcc dot gnu.org @ 2012-05-09 10:40 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53294
Bug #: 53294
Summary: Optimize out some exception code
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: glisse@gcc.gnu.org
Hello,
it would be great if the compiler could transform code like:
try {
throw 42;
} catch(...) {
}
into nothing (or in practice into a simple goto, since there will be code
around). It already knows to remove the code after "throw", it could statically
check that the exception will be caught locally and thus skip the __cxa_throw,
__cxa_begin_catch game.
Filed as C++ front-end, but it might be for the middle-end, since it would be
best if this optimization happened after inlining.
^ permalink raw reply [flat|nested] 3+ messages in thread* [Bug c++/53294] Optimize out some exception code 2012-05-09 10:40 [Bug c++/53294] New: Optimize out some exception code glisse at gcc dot gnu.org @ 2012-05-09 14:36 ` rguenth at gcc dot gnu.org 2021-07-23 0:12 ` pinskia at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: rguenth at gcc dot gnu.org @ 2012-05-09 14:36 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53294 Richard Guenther <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2012-05-09 Ever Confirmed|0 |1 --- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-05-09 13:55:37 UTC --- Certainly interesting. We lower things too early into __cxa calls though (I think) to make this work easily. Consider cases like struct X { int i; }; int foo (void) { try { X x; x.i = 5; throw x; } catch (X& x) { return x.i; } catch (...) { return 0; } } ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/53294] Optimize out some exception code 2012-05-09 10:40 [Bug c++/53294] New: Optimize out some exception code glisse at gcc dot gnu.org 2012-05-09 14:36 ` [Bug c++/53294] " rguenth at gcc dot gnu.org @ 2021-07-23 0:12 ` pinskia at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-07-23 0:12 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53294 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |DUPLICATE See Also| |https://gcc.gnu.org/bugzill | |a/show_bug.cgi?id=38658 Status|NEW |RESOLVED --- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Dup of bug 38658. *** This bug has been marked as a duplicate of bug 38658 *** ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-07-23 0:12 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2012-05-09 10:40 [Bug c++/53294] New: Optimize out some exception code glisse at gcc dot gnu.org 2012-05-09 14:36 ` [Bug c++/53294] " rguenth at gcc dot gnu.org 2021-07-23 0:12 ` pinskia at gcc dot gnu.org
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