https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80168
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org --- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Created attachment 41047 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41047&action=edit gcc7-pr80168.patch Untested fix. Various comments e.g. in get_bit_range assert that DECL_BIT_FIELD_REPRESENTATIVE in a VLA structure is guaranteed by construction to have the same DECL_FIELD_OFFSET, so even when during low gimple they are not the same, we should be able to use the 3rd COMPONENT_REF arguments from the original field and the DECL_FIELD_BIT_OFFSET difference should give the actual start differences between the field and its representative.