aarch64: Introduce aarch64_isa_mode type

Currently there are many places where an aarch64_feature_flags variable
is used, but only the bottom three isa mode bits are set and read.
Using a separate data type for these value makes it more clear that
they're not expected or required to have any of their upper feature bits
set.  It will also make things simpler and more efficient when we extend
aarch64_feature_flags to 128 bits.

This patch uses explicit casts whenever converting from an
aarch64_feature_flags value to an aarch64_isa_mode value.  This isn't
strictly necessary, but serves to highlight the locations where an
explicit conversion will become necessary later.

gcc/ChangeLog:

	* config/aarch64/aarch64-opts.h: Add aarch64_isa_mode typedef.
	* config/aarch64/aarch64-protos.h
	(aarch64_gen_callee_cookie): Use aarch64_isa_mode parameter.
	(aarch64_sme_vq_immediate): Ditto.
	* config/aarch64/aarch64.cc
	(aarch64_fntype_pstate_sm): Use aarch64_isa_mode values.
	(aarch64_fntype_pstate_za): Ditto.
	(aarch64_fndecl_pstate_sm): Ditto.
	(aarch64_fndecl_pstate_za): Ditto.
	(aarch64_fndecl_isa_mode): Ditto.
	(aarch64_cfun_incoming_pstate_sm): Ditto.
	(aarch64_cfun_enables_pstate_sm): Ditto.
	(aarch64_call_switches_pstate_sm): Ditto.
	(aarch64_gen_callee_cookie): Ditto.
	(aarch64_callee_isa_mode): Ditto.
	(aarch64_insn_callee_abi): Ditto.
	(aarch64_sme_vq_immediate): Ditto.
	(aarch64_add_offset_temporaries): Ditto.
	(aarch64_add_offset): Ditto.
	(aarch64_add_sp): Ditto.
	(aarch64_sub_sp): Ditto.
	(aarch64_guard_switch_pstate_sm): Ditto.
	(aarch64_switch_pstate_sm): Ditto.
	(aarch64_init_cumulative_args): Ditto.
	(aarch64_allocate_and_probe_stack_space): Ditto.
	(aarch64_expand_prologue): Ditto.
	(aarch64_expand_epilogue): Ditto.
	(aarch64_start_call_args): Ditto.
	(aarch64_expand_call): Ditto.
	(aarch64_end_call_args): Ditto.
	(aarch64_set_current_function): Ditto, with added conversions.
	(aarch64_handle_attr_arch): Avoid macro with changed type.
	(aarch64_handle_attr_cpu): Ditto.
	(aarch64_handle_attr_isa_flags): Ditto.
	(aarch64_switch_pstate_sm_for_landing_pad):
	Use arch64_isa_mode values.
	(aarch64_switch_pstate_sm_for_jump): Ditto.
	(pass_switch_pstate_sm::gate): Ditto.
	* config/aarch64/aarch64.h
	(AARCH64_ISA_MODE_{SM_ON|SM_OFF|ZA_ON}): New macros.
	(AARCH64_FL_SM_STATE): Mark as possibly unused.
	(AARCH64_ISA_MODE_SM_STATE): New aarch64_isa_mode mask.
	(AARCH64_DEFAULT_ISA_MODE): New aarch64_isa_mode value.
	(AARCH64_FL_DEFAULT_ISA_MODE): Define using above value.
	(AARCH64_ISA_MODE): Change type to aarch64_isa_mode.
	(arm_pcs): Use aarch64_isa_mode value.

0 files changed, 0 insertions, 0 deletions