https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112830
--- Comment #13 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:68d32d02035fc081384ec6d6fd275e49ffa5d016 commit r14-6182-g68d32d02035fc081384ec6d6fd275e49ffa5d016 Author: Richard Biener <rguent...@suse.de> Date: Mon Dec 4 10:35:38 2023 +0100 middle-end/112830 - avoid gimplifying non-default addr-space assign to memcpy The following avoids turning aggregate copy involving non-default address-spaces to memcpy since that is not prepared for that. GIMPLE verification no longer accepts WITH_SIZE_EXPR in aggregate copies, the following re-allows that for the RHS. I also needed to adjust one assert in DCE. get_memory_address is used for string builtin expansion, so instead of fixing that up for non-generic address-spaces I've put an assert there. I'll note that the same issue exists for initialization from an empty CTOR which we gimplify to a memset call but since we are not prepared to handle RTL expansion of the original VLA init and I failed to provide test coverage (without extending the GNU C extension for VLA structs) and the Ada frontend (or other frontends) to not have address-space support the patch instead asserts we only see generic address-spaces there. PR middle-end/112830 * gimplify.cc (gimplify_modify_expr): Avoid turning aggregate copy of non-generic address-spaces to memcpy. (gimplify_modify_expr_to_memcpy): Assert we are dealing with a copy inside the generic address-space. (gimplify_modify_expr_to_memset): Likewise. * tree-cfg.cc (verify_gimple_assign_single): Allow WITH_SIZE_EXPR as part of the RHS of an assignment. * builtins.cc (get_memory_address): Assert we are dealing with the generic address-space. * tree-ssa-dce.cc (ref_may_be_aliased): Handle WITH_SIZE_EXPR. * gcc.target/avr/pr112830.c: New testcase. * gcc.target/i386/pr112830.c: Likewise.
