https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98193
--- Comment #4 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:4164e58bfd5d57e7399f91c7c27ae6ccebc7dcb0 commit r11-5874-g4164e58bfd5d57e7399f91c7c27ae6ccebc7dcb0 Author: Jakub Jelinek <ja...@redhat.com> Date: Wed Dec 9 09:34:51 2020 +0100 fold-const: Fix up native_encode_initializer missing field handling [PR98193] When native_encode_initializer is called with non-NULL mask (i.e. ATM bit_cast only), it checks if the current index in the CONSTRUCTOR (if any) is the next initializable FIELD_DECL, and if not, decrements cnt and performs the iteration with that FIELD_DECL as field and val of zero (so that it computes mask properly). As the testcase shows, I forgot to set pos to the byte position of the field though (like it is done for e.g. index referenced FIELD_DECLs in the constructor. 2020-12-09 Jakub Jelinek <ja...@redhat.com> PR c++/98193 * fold-const.c (native_encode_initializer): Set pos to field's byte position if iterating over a field with missing initializer. * g++.dg/cpp2a/bit-cast7.C: New test.
