[Bug target/114846] powerpc: epilogue in _Unwind_RaiseException corrupts return value due to __builtin_eh_return
cvs-commit at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Mon Jun 24 01:49:01 GMT 2024
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114846
--- Comment #16 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Kewen Lin <linkw@gcc.gnu.org>:
https://gcc.gnu.org/g:549701628b64a7c4ac9bb5f9623e83a8dc1d828c
commit r11-11535-g549701628b64a7c4ac9bb5f9623e83a8dc1d828c
Author: Kewen Lin <linkw@linux.ibm.com>
Date: Tue May 28 21:13:40 2024 -0500
rs6000: Don't clobber return value when eh_return called [PR114846]
As the associated test case in PR114846 shows, currently
with eh_return involved some register restoring for EH
RETURN DATA in epilogue can clobber the one which holding
the return value. Referring to the existing handlings in
some other targets, this patch makes eh_return expander
call one new define_insn_and_split eh_return_internal which
directly calls rs6000_emit_epilogue with epilogue_type
EPILOGUE_TYPE_EH_RETURN instead of the previous treating
normal return with crtl->calls_eh_return specially.
PR target/114846
gcc/ChangeLog:
* config/rs6000/rs6000-logue.c (rs6000_emit_epilogue): As
EPILOGUE_TYPE_EH_RETURN would be passed as epilogue_type directly
now, adjust the relevant handlings on it.
* config/rs6000/rs6000.md (eh_return expander): Append by calling
gen_eh_return_internal and emit_barrier.
(eh_return_internal): New define_insn_and_split, call function
rs6000_emit_epilogue with epilogue type EPILOGUE_TYPE_EH_RETURN.
gcc/testsuite/ChangeLog:
* gcc.target/powerpc/pr114846.c: New test.
(cherry picked from commit e5fc5d42d25c86ae48178db04ce64d340a834614)
More information about the Gcc-bugs
mailing list