On Sat, Mar 12, 2022 at 07:40:08PM -0000, Roger Sayle wrote: > 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.
Thanks for the fix! Segher
