[Bug middle-end/104558] [9/10/11/12 Regression] ICE: in expand_call, at calls.cc:3601 with -fabi-version=9 on pr83487.c
cvs-commit at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Thu Mar 3 08:12:32 GMT 2022
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104558
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:
https://gcc.gnu.org/g:e6e6e0a97340068c90fe091482efbaacd6474754
commit r12-7458-ge6e6e0a97340068c90fe091482efbaacd6474754
Author: Jakub Jelinek <jakub@redhat.com>
Date: Thu Mar 3 09:11:09 2022 +0100
calls: When bypassing emit_push_insn for 0 sized arg, emit at least
anti_adjust_stack for alignment pad if needed [PR104558]
The following testcase ICEs on x86_64 when asked to use the pre-GCC 8
ABI where zero sized arguments weren't ignored.
In GCC 7 the emit_push_insn calls in store_one_arg were unconditional,
it is true that they didn't actually push anything because it had zero
size, but because arg->locate.alignment_pad is 8 in this case,
emit_push_insn at the end performs
if (alignment_pad && args_addr == 0)
anti_adjust_stack (alignment_pad);
and an assert larger on is upset if we don't do it.
The following patch keeps the emit_push_insn conditional but calls
the anti_adjust_stack when needed by hand for the zero sized arguments.
For the new x86_64 ABI where zero sized arguments are ignored
arg->locate.alignment_pad is 0 in this case, so nothing changes
- we in that case really do ignore it.
There is another emit_push_insn call earlier in store_one_arg, also made
conditional on non-zero size by Marek in GCC 8, but that one is for
arguments with non-BLKmode and the only way those can be zero size is
if they are TYPE_EMPTY_P aka when they are completely ignored. But
I believe arg->locate.alignment_pad should be 0 in that case, so IMHO
there is no need to do anything in the second spot.
2022-03-03 Jakub Jelinek <jakub@redhat.com>
PR middle-end/104558
* calls.cc (store_one_arg): When not calling emit_push_insn
because size_rtx is const0_rtx, call at least anti_adjust_stack
on arg->locate.alignment_pad if !argblock and the alignment might
be non-zero.
* gcc.dg/pr104558.c: New test.
More information about the Gcc-bugs
mailing list