https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104885
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Roger Sayle <sa...@gcc.gnu.org>: https://gcc.gnu.org/g:41d1f11f5f693a2a06c65c9467a28dfeb02aed85 commit r12-7833-g41d1f11f5f693a2a06c65c9467a28dfeb02aed85 Author: Roger Sayle <ro...@nextmovesoftware.com> Date: Sat Mar 26 08:10:27 2022 -1000 PR middle-end/104885: Fix ICE with large stack frame on powerpc64. My recent testcase for PR c++/84964.C stress tests the middle-end by attempting to pass a UINT_MAX sized structure on the stack. Although my fix to PR84964 avoids the ICE after sorry on x86_64 and similar targets, a related issue still exists on powerpc64 (and similar ACCUMULATE_OUTGOING_ARGS/ARGS_GROW_DOWNWARD targets) which don't issue a "sorry, unimplemented" message, but instead ICE elsewhere. After attempting several alternate fixes, the simplest solution is to just defensively check in mark_stack_region_used that the upper bound of the region lies within the allocated stack_usage_map array, which is of size highest_outgoing_arg_in_use. When this isn't the case, the code now follows the same path as for variable sized regions, and uses stack_usage_watermark rather than a map. 2022-03-26 Roger Sayle <ro...@nextmovesoftware.com> gcc/ChangeLog PR middle-end/104885 * calls.cc (mark_stack_region_used): Check that the region is within the allocated size of stack_usage_map.
