https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86593
--- Comment #11 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> --- Author: hjl Date: Tue Sep 4 20:42:06 2018 New Revision: 264096 URL: https://gcc.gnu.org/viewcvs?rev=264096&root=gcc&view=rev Log: DWARF: Allow hard frame pointer even if frame pointer isn't used r251028 commit cd557ff63f388ad27c376d0a225e74d3594a6f9d Author: hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4> Date: Thu Aug 10 15:29:05 2017 +0000 i386: Don't use frame pointer without stack access When there is no stack access, there is no need to use frame pointer even if -fno-omit-frame-pointer is used and caller's frame pointer is unchanged. frame pointer may not be available even if -fno-omit-frame-pointer is used. When this happened, arg pointer may be eliminated by hard frame pointer. Since hard frame pointer is encoded with DW_OP_fbreg which uses the DW_AT_frame_base attribute, not hard frame pointer directly, we should allow hard frame pointer when generating DWARF info even if frame pointer isn't used. gcc/ PR debug/86593 * dwarf2out.c (based_loc_descr): Allow hard frame pointer even if frame pointer isn't used. (compute_frame_pointer_to_fb_displacement): Likewise. gcc/testsuite/ PR debug/86593 * g++.dg/pr86593.C: New test. Added: trunk/gcc/testsuite/g++.dg/pr86593.C Modified: trunk/gcc/ChangeLog trunk/gcc/dwarf2out.c trunk/gcc/testsuite/ChangeLog
