https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93121
--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:e4f1cbc35b1e823a0a6e58eeca61c8c6ca351875 commit r11-2225-ge4f1cbc35b1e823a0a6e58eeca61c8c6ca351875 Author: Jakub Jelinek <ja...@redhat.com> Date: Mon Jul 20 10:24:19 2020 +0200 gimple-fold: Handle bitfields in fold_const_aggregate_ref_1 [PR93121] When working on __builtin_bit_cast that needs to handle bitfields too, I've made the following change to handle at least some bitfields in fold_const_aggregate_ref_1 (those that have integral representative). It already handles some, but only those that start and end at byte boundaries. 2020-07-20 Jakub Jelinek <ja...@redhat.com> PR libstdc++/93121 * gimple-fold.c (fold_const_aggregate_ref_1): For COMPONENT_REF of a bitfield not aligned on byte boundaries try to fold_ctor_reference DECL_BIT_FIELD_REPRESENTATIVE if any and adjust it depending on endianity. * gcc.dg/tree-ssa/pr93121-2.c: New test.
