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* [Bug ipa/114254] New: Indirect inlining through C++ member pointers fails if the underlying class has a virtual function @ 2024-03-06 15:40 jamborm at gcc dot gnu.org 2024-03-07 8:08 ` [Bug ipa/114254] [11/12/13/14 regression] " rguenth at gcc dot gnu.org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: jamborm at gcc dot gnu.org @ 2024-03-06 15:40 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114254 Bug ID: 114254 Summary: Indirect inlining through C++ member pointers fails if the underlying class has a virtual function Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: ipa Assignee: jamborm at gcc dot gnu.org Reporter: jamborm at gcc dot gnu.org Target Milestone: --- Created attachment 57634 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57634&action=edit testcase Just adding a virtual method to the class in our test testsuite/g++.dg/ipa/iinline-2.C and it will unfortunately stop working. At some point the C++ FE got clever and stopped emitting the complex code checking if a member pointer points to a virtual method or a normal one when the base class does not have any virtual method. But that meant that our testcases stopped exercising the pattern matching code in ipa_analyze_indirect_call_uses and when that code changed with r10-917-g3b47da42de621c (Martin Jambor: Make SRA re-construct original memory accesses when easy) because of a small mistake, we lost the intended ability to inline also these cases. So this is a regression against 9.5, unfortunately. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug ipa/114254] [11/12/13/14 regression] Indirect inlining through C++ member pointers fails if the underlying class has a virtual function 2024-03-06 15:40 [Bug ipa/114254] New: Indirect inlining through C++ member pointers fails if the underlying class has a virtual function jamborm at gcc dot gnu.org @ 2024-03-07 8:08 ` rguenth at gcc dot gnu.org 2024-03-08 14:57 ` jamborm at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: rguenth at gcc dot gnu.org @ 2024-03-07 8:08 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114254 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Priority|P3 |P2 Status|UNCONFIRMED |NEW Keywords| |missed-optimization Target Milestone|--- |11.5 Last reconfirmed| |2024-03-07 Ever confirmed|0 |1 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug ipa/114254] [11/12/13/14 regression] Indirect inlining through C++ member pointers fails if the underlying class has a virtual function 2024-03-06 15:40 [Bug ipa/114254] New: Indirect inlining through C++ member pointers fails if the underlying class has a virtual function jamborm at gcc dot gnu.org 2024-03-07 8:08 ` [Bug ipa/114254] [11/12/13/14 regression] " rguenth at gcc dot gnu.org @ 2024-03-08 14:57 ` jamborm at gcc dot gnu.org 2024-03-19 21:38 ` cvs-commit at gcc dot gnu.org 2024-03-20 16:18 ` [Bug ipa/114254] [11/12/13 " jamborm at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: jamborm at gcc dot gnu.org @ 2024-03-08 14:57 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114254 --- Comment #1 from Martin Jambor <jamborm at gcc dot gnu.org> --- I have proposed a patch on the mailing list: https://inbox.sourceware.org/gcc-patches/ri6r0gkzvi4.fsf@virgil.suse.cz/T/#u ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug ipa/114254] [11/12/13/14 regression] Indirect inlining through C++ member pointers fails if the underlying class has a virtual function 2024-03-06 15:40 [Bug ipa/114254] New: Indirect inlining through C++ member pointers fails if the underlying class has a virtual function jamborm at gcc dot gnu.org 2024-03-07 8:08 ` [Bug ipa/114254] [11/12/13/14 regression] " rguenth at gcc dot gnu.org 2024-03-08 14:57 ` jamborm at gcc dot gnu.org @ 2024-03-19 21:38 ` cvs-commit at gcc dot gnu.org 2024-03-20 16:18 ` [Bug ipa/114254] [11/12/13 " jamborm at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2024-03-19 21:38 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114254 --- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Martin Jambor <jamborm@gcc.gnu.org>: https://gcc.gnu.org/g:bf838884fac573b4902a21bb82d9b6f777e32cb9 commit r14-9559-gbf838884fac573b4902a21bb82d9b6f777e32cb9 Author: Martin Jambor <mjambor@suse.cz> Date: Tue Mar 19 22:33:27 2024 +0100 ipa: Fix C++ member ptr indirect inlining (PR 114254, PR 108802) Even though we have had code to handle creation of indirect call graph edges (so that these calls can than be made direct as part of IPA-CP and inlining and eventually also inlined) for C++ member pointers for many years, it turns out that it does not work for lambdas and that it has been severely broken since GCC 10 when the base class has virtual functions. Lambdas don't work because the code cannot work with structures representing member function pointers because they are passed by reference instead by value and the code was not ready for that. The presence of virtual methods broke thinks because at some point C++ FE got clever and stopped emitting the check for virtual methods when the base class does not have any and that in turn made our existing testcases not test the necessary pattern matching code. The pattern matcher had a small bug which did not matter before r10-917-g3b47da42de621c but did afterwards. This patch changes the pattern matcher to match both of these cases. gcc/ChangeLog: 2024-03-06 Martin Jambor <mjambor@suse.cz> PR ipa/108802 PR ipa/114254 * ipa-prop.cc (ipa_get_stmt_member_ptr_load_param): Fix case looking at COMPONENT_REFs directly from a PARM_DECL, also recognize loads from a pointer parameter. (ipa_analyze_indirect_call_uses): Also recognize loads from a pointer parameter, also recognize the case when pfn pointer is loaded in its own BB. gcc/testsuite/ChangeLog: 2024-03-06 Martin Jambor <mjambor@suse.cz> PR ipa/108802 PR ipa/114254 * g++.dg/ipa/iinline-4.C: New test. * g++.dg/ipa/pr108802.C: Likewise. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug ipa/114254] [11/12/13 regression] Indirect inlining through C++ member pointers fails if the underlying class has a virtual function 2024-03-06 15:40 [Bug ipa/114254] New: Indirect inlining through C++ member pointers fails if the underlying class has a virtual function jamborm at gcc dot gnu.org ` (2 preceding siblings ...) 2024-03-19 21:38 ` cvs-commit at gcc dot gnu.org @ 2024-03-20 16:18 ` jamborm at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: jamborm at gcc dot gnu.org @ 2024-03-20 16:18 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114254 Martin Jambor <jamborm at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|[11/12/13/14 regression] |[11/12/13 regression] |Indirect inlining through |Indirect inlining through |C++ member pointers fails |C++ member pointers fails |if the underlying class has |if the underlying class has |a virtual function |a virtual function --- Comment #3 from Martin Jambor <jamborm at gcc dot gnu.org> --- Fixed on trunk. I may consider backporting to GCC 13 but probably not to earlier versions. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2024-03-20 16:18 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2024-03-06 15:40 [Bug ipa/114254] New: Indirect inlining through C++ member pointers fails if the underlying class has a virtual function jamborm at gcc dot gnu.org 2024-03-07 8:08 ` [Bug ipa/114254] [11/12/13/14 regression] " rguenth at gcc dot gnu.org 2024-03-08 14:57 ` jamborm at gcc dot gnu.org 2024-03-19 21:38 ` cvs-commit at gcc dot gnu.org 2024-03-20 16:18 ` [Bug ipa/114254] [11/12/13 " jamborm at gcc dot gnu.org
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