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* [Bug c++/111245] New: miscompilation: missing assignment when exception thrown @ 2023-08-30 20:19 briangreenery at gmail dot com 2023-08-30 20:26 ` [Bug ipa/111245] " briangreenery at gmail dot com ` (4 more replies) 0 siblings, 5 replies; 6+ messages in thread From: briangreenery at gmail dot com @ 2023-08-30 20:19 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111245 Bug ID: 111245 Summary: miscompilation: missing assignment when exception thrown Product: gcc Version: 13.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: briangreenery at gmail dot com Target Milestone: --- gcc version 13.2.0 (Compiler-Explorer-Build-gcc--binutils-2.40) Target: x86_64-linux-gnu It looks like initialization is incorrectly skipped when: * The initialization is overwritten by an unconditional assignment from a function * However, that function throws an exception which avoids the assignment The following code should return 5, but it returns random garbage on -O1 or -O2. https://godbolt.org/z/T3qTnheYW # 0 "/app/example.cpp" # 1 "/app//" # 0 "<built-in>" # 0 "<command-line>" # 1 "/usr/include/stdc-predef.h" 1 3 4 # 0 "<command-line>" 2 # 1 "/app/example.cpp" struct Int { int value; }; __attribute__((noipa)) Int always_throws() { throw 123; } void foo(Int &x) { try { x = always_throws(); } catch (...) { } } int main() { Int x; x.value = 5; foo(x); return x.value; } ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug ipa/111245] miscompilation: missing assignment when exception thrown 2023-08-30 20:19 [Bug c++/111245] New: miscompilation: missing assignment when exception thrown briangreenery at gmail dot com @ 2023-08-30 20:26 ` briangreenery at gmail dot com 2023-08-30 21:42 ` [Bug ipa/111245] [12/13/14 Regression] " pinskia at gcc dot gnu.org ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: briangreenery at gmail dot com @ 2023-08-30 20:26 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111245 --- Comment #1 from Brian Green <briangreenery at gmail dot com> --- It seems working on gcc 11.4 or earlier, but broken since gcc 12.1 on all versions I could test on godbolt.org. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug ipa/111245] [12/13/14 Regression] miscompilation: missing assignment when exception thrown 2023-08-30 20:19 [Bug c++/111245] New: miscompilation: missing assignment when exception thrown briangreenery at gmail dot com 2023-08-30 20:26 ` [Bug ipa/111245] " briangreenery at gmail dot com @ 2023-08-30 21:42 ` pinskia at gcc dot gnu.org 2023-08-30 22:26 ` jakub at gcc dot gnu.org ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-08-30 21:42 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111245 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|miscompilation: missing |[12/13/14 Regression] |assignment when exception |miscompilation: missing |thrown |assignment when exception | |thrown Known to work| |11.4.0 Status|UNCONFIRMED |NEW Ever confirmed|0 |1 Target Milestone|--- |12.4 Last reconfirmed| |2023-08-30 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Confirmed. I thought I saw another one almost the exact same but I can't find it right now. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug ipa/111245] [12/13/14 Regression] miscompilation: missing assignment when exception thrown 2023-08-30 20:19 [Bug c++/111245] New: miscompilation: missing assignment when exception thrown briangreenery at gmail dot com 2023-08-30 20:26 ` [Bug ipa/111245] " briangreenery at gmail dot com 2023-08-30 21:42 ` [Bug ipa/111245] [12/13/14 Regression] " pinskia at gcc dot gnu.org @ 2023-08-30 22:26 ` jakub at gcc dot gnu.org 2023-08-31 10:48 ` [Bug ipa/111245] [12/13/14 Regression] miscompilation: missing assignment when exception thrown since r12-5244-g64f3e71c302b4a13e61656ee509e7050b9bce978 rguenth at gcc dot gnu.org 2024-06-20 9:13 ` [Bug ipa/111245] [12/13/14/15 " rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: jakub at gcc dot gnu.org @ 2023-08-30 22:26 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111245 Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |hubicka at gcc dot gnu.org, | |jakub at gcc dot gnu.org --- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Started with r12-5244-g64f3e71c302b4a13e61656ee509e7050b9bce978 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug ipa/111245] [12/13/14 Regression] miscompilation: missing assignment when exception thrown since r12-5244-g64f3e71c302b4a13e61656ee509e7050b9bce978 2023-08-30 20:19 [Bug c++/111245] New: miscompilation: missing assignment when exception thrown briangreenery at gmail dot com ` (2 preceding siblings ...) 2023-08-30 22:26 ` jakub at gcc dot gnu.org @ 2023-08-31 10:48 ` rguenth at gcc dot gnu.org 2024-06-20 9:13 ` [Bug ipa/111245] [12/13/14/15 " rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: rguenth at gcc dot gnu.org @ 2023-08-31 10:48 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111245 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Priority|P3 |P2 --- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- Sounds like call LHS analysis mistake in modref. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug ipa/111245] [12/13/14/15 Regression] miscompilation: missing assignment when exception thrown since r12-5244-g64f3e71c302b4a13e61656ee509e7050b9bce978 2023-08-30 20:19 [Bug c++/111245] New: miscompilation: missing assignment when exception thrown briangreenery at gmail dot com ` (3 preceding siblings ...) 2023-08-31 10:48 ` [Bug ipa/111245] [12/13/14 Regression] miscompilation: missing assignment when exception thrown since r12-5244-g64f3e71c302b4a13e61656ee509e7050b9bce978 rguenth at gcc dot gnu.org @ 2024-06-20 9:13 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: rguenth at gcc dot gnu.org @ 2024-06-20 9:13 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111245 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|12.4 |12.5 --- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> --- GCC 12.4 is being released, retargeting bugs to GCC 12.5. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2024-06-20 9:13 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-08-30 20:19 [Bug c++/111245] New: miscompilation: missing assignment when exception thrown briangreenery at gmail dot com 2023-08-30 20:26 ` [Bug ipa/111245] " briangreenery at gmail dot com 2023-08-30 21:42 ` [Bug ipa/111245] [12/13/14 Regression] " pinskia at gcc dot gnu.org 2023-08-30 22:26 ` jakub at gcc dot gnu.org 2023-08-31 10:48 ` [Bug ipa/111245] [12/13/14 Regression] miscompilation: missing assignment when exception thrown since r12-5244-g64f3e71c302b4a13e61656ee509e7050b9bce978 rguenth at gcc dot gnu.org 2024-06-20 9:13 ` [Bug ipa/111245] [12/13/14/15 " rguenth at gcc dot gnu.org
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