[PATCH][AARCH64]Simplify call, call_value, sibcall, sibcall_value patterns.

[Renlin Li]

Hi all,

This patch refactors the code used in call, call_value, sibcall,
sibcall_value expanders.

Before the change, the logic is following:

call expander          --> call_internal          --> call_reg/call_symbol
call_vlaue expander    --> call_value_internal    --> call_value_reg/call_value_symbol

sibcall expander       --> sibcall_internal       --> sibcall_insn
sibcall_value expander --> sibcall_value_internal --> sibcall_value_insn

After the change, the logic is simplified into:

call expander          --> aarch64_expand_call() --> call_insn
call_value expander    --> aarch64_expand_call() --> call_value_insn

sibcall expander       --> aarch64_expand_call() --> sibcall_insn
sibcall_value expander --> aarch64_expand_call() --> sibcall_value_insn

The code are factored out from each expander into aarch64_expand_call ().

This also fixes the two issues Richard Henderson suggests in comments 8:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64971

aarch64-none-elf regression test Okay, aarch64-linux bootstrap Okay.
Okay for trunk?

Regards,
Renlin Li


gcc/ChangeLog:

2016-12-01  Renlin Li  <renlin.li@arm.com>

	* config/aarch64/aarch64-protos.h (aarch64_expand_call): Declare.
	* config/aarch64/aarch64.c (aarch64_expand_call): Define.
	* config/aarch64/constraints.md (Usf): Add long call check.
	* config/aarch64/aarch64.md (call): Use aarch64_expand_call.
	(call_value): Likewise.
	(sibcall): Likewise.
	(sibcall_value): Likewise.
	(call_insn): New.
	(call_value_insn): New.
	(sibcall_insn): Update rtx pattern.
	(sibcall_value_insn): Likewise.
	(call_internal): Remove.
	(call_value_internal): Likewise.
	(sibcall_internal): Likewise.
	(sibcall_value_internal): Likewise.
	(call_reg): Likewise.
	(call_symbol): Likewise.
	(call_value_reg): Likewise.
	(call_value_symbol): Likewise.

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