https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82735
--- Comment #17 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by hongtao Liu <liuho...@gcc.gnu.org>: https://gcc.gnu.org/g:16465ceb06cc1f65cfca3c0eb2c1ee27ab03bdfd commit r12-1252-g16465ceb06cc1f65cfca3c0eb2c1ee27ab03bdfd Author: liuhongt <hongtao....@intel.com> Date: Tue Jun 1 09:00:57 2021 +0800 CALL_INSN may not be a real function call. Use "used" flag for CALL_INSN to indicate it's a fake call. If it's a fake call, it won't have its own function stack. gcc/ChangeLog PR target/82735 * df-scan.c (df_get_call_refs): When call_insn is a fake call, it won't use stack pointer reg. * final.c (leaf_function_p): When call_insn is a fake call, it won't affect caller as a leaf function. * reg-stack.c (callee_clobbers_any_stack_reg): New. (subst_stack_regs): When call_insn doesn't clobber any stack reg, don't clear the arguments. * rtl.c (shallow_copy_rtx): Don't clear flag used when orig is a insn. * shrink-wrap.c (requires_stack_frame_p): No need for stack frame for a fake call. * rtl.h (FAKE_CALL_P): New macro.
