https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77455
--- Comment #3 from wilco at gcc dot gnu.org --- Author: wilco Date: Fri Jan 20 15:34:41 2017 New Revision: 244724 URL: https://gcc.gnu.org/viewcvs?rev=244724&root=gcc&view=rev Log: This patch simplifies the handling of EH return. We force the use of the frame pointer so the return location is always at FP + 8. This means we can emit a simple volatile access in EH_RETURN_HANDLER_RTX without needing md patterns, splitters and frame offset calculations. The new implementation also fixes various bugs in aarch64_final_eh_return_addr, which does not work with -fomit-frame-pointer, alloca or outgoing arguments. Backport from mainline gcc/ PR target/77455 * config/aarch64/aarch64.md (eh_return): Remove pattern and splitter. * config/aarch64/aarch64.h (AARCH64_EH_STACKADJ_REGNUM): Remove. (EH_RETURN_HANDLER_RTX): New define. * config/aarch64/aarch64.c (aarch64_frame_pointer_required): Force frame pointer in EH return functions. (aarch64_expand_epilogue): Add barrier for eh_return. (aarch64_final_eh_return_addr): Remove. (aarch64_eh_return_handler_rtx): New function. * config/aarch64/aarch64-protos.h (aarch64_final_eh_return_addr): Remove. (aarch64_eh_return_handler_rtx): New prototype. testsuite/ PR target/77455 * gcc.target/aarch64/eh_return.c: New test. Added: branches/gcc-6-branch/gcc/testsuite/gcc.target/aarch64/eh_return.c Modified: branches/gcc-6-branch/gcc/ChangeLog branches/gcc-6-branch/gcc/config/aarch64/aarch64-protos.h branches/gcc-6-branch/gcc/config/aarch64/aarch64.c branches/gcc-6-branch/gcc/config/aarch64/aarch64.h branches/gcc-6-branch/gcc/config/aarch64/aarch64.md branches/gcc-6-branch/gcc/testsuite/ChangeLog
