MIPS compact branch support

MIPS compact branch support

gcc/
	* config/mips/mips-opts.h (mips_cb_setting): New enum.
	* config/mips/mips-protos.h: Add definitions for
	mips_output_jump and mips_output_equal_conditional_branch
	* gcc/config/mips/mips.c (MIPS_JR): Change to support the
	JIC instruction.
	(mips_emit_compare): Add support for the MIPS R6 conditional
	compact branches.
	(mips_process_sync_loop): Likewise.
	(mips_output_order_conditional_branch): Likewise.
	(mips16_build_call_stub): Change MIPS_CALL to
	mips_output_jump.
	(mips_print_operand_punctuation): Update 's' case to only
	apply to micromips r2.
	(mips_adjust_insn_length): Add support for forbidden slot
	hazards.
	(mips_avoid_hazard): Likewise.
	(mips_reorg_process_insns): Likewise.
	(mips_output_jump): New function.
	(mips_output_equal_conditional_branch): Likewise.
	(mips_output_conditional_branch): Use jrc/bc if compact
	branch support is enabled.  Ensure the forbidden slots
	between the two branch instructions is filled with a nop.
	(mips_option_override): Add support to process the compact
	branch option and set the correct defaults.  Prevent
	non-explict relocs being using for MIPS R6.
	(mips_trampoline_init): Add compact branch support.
	(mips_mult_zero_zero_cost): Allow zero initialisation of
	accumulators with TARGET_DSP.
	* gcc/config/mips/mips.h (TARGET_CB_NEVER): New define.
	(TARGET_CB_MAYBE): New define.
	(TARGET_CB_ALWAYS): New define.
	(ISA_HAS_DELAY_SLOTS): New define.
	(ISA_HAS_COMPACT_BRANCHES): New define.
	(ISA_HAS_JRC): New define.
	(MIPS_BRANCH_C): New define.
	(MIPS_CALL): Removed.
	(MICROMIPS_J): Removed.
	* config/mips/mips.md (compact_form): New attr.
	(hazard): Add support for forbidden slots.
	(define_delay): Add support for compact branches.
	(*branch_order<mode>): Likewise.
	(*branch_order<mode>_inverted): Likewise.
	(*branch_equality<mode>): Likewise.
	(*branch_equality<mode>_inverted): Likewise.
	(*jump_absolute): Likewise.
	(*jump_pic): Likewise.
	(indirect_jump): Use mips_output_jump to produce assembly output.
	(tablejump_<mode>"): Likewise.
	(*<optab>"): Likewise.
	(<optab>_internal): Likewise.
	(sibcall_internal): Likewise.
	(sibcall_value_internal): Likewise.
	(sibcall_value_multiple_internal): Likewise.
	(call_internal): Likewise.
	(call_split): Likewise.
	(call_internal_direct): Likewise.
	(call_direct_split): Likewise.
	(call_value_internal): Likewise.
	(call_value_split): Likewise.
	(call_value_internal_direct): Likewise.
	(call_value_direct_split): Likewise.
	(call_value_multiple_internal): Likewise.
	(call_value_multiple_split): Likewise.
	(mips_get_fcsr_mips16_<mode>): Likewise.
	(mips_set_fcsr_mips16_<mode>): Likewise.
	(tls_get_tp_mips16_<mode>): Likewise.
	* config/mips/mips.opt: Add -mcompact-branches option.
	* config/mips/predicates.md (order_operator): Ensure the
	conditional compact branches are only used if the ISA them.
	* doc/invoke.texi: Document -mcompact-branches option.

gcc/testsuite/
	* gcc.target/mips/mips.exp (mips-dg-options): Handle the
	dependencies between ISA level and compact-branches.
	* gcc.target/mips/branch-10.c: Update expected output to allow
	compact forms of b/bal.
	* gcc.target/mips/branch-11.c: Likewise.
	* gcc.target/mips/branch-12.c: Likewise.
	* gcc.target/mips/branch-13.c: Likewise.
	* gcc.target/mips/branch-3.c: Likewise.
	* gcc.target/mips/branch-4.c: Likewise.
	* gcc.target/mips/branch-5.c: Likewise.
	* gcc.target/mips/branch-6.c: Likewise.
	* gcc.target/mips/branch-7.c: Likewise.
	* gcc.target/mips/branch-8.c: Likewise.
	* gcc.target/mips/branch-9.c: Likewise.
	* gcc.target/mips/branch-cost-1.c: Likewise.
	* gcc.target/mips/call-1.c: Likewise.
	* gcc.target/mips/call-2.c: Likewise.
	* gcc.target/mips/call-3.c: Likewise.
	* gcc.target/mips/call-4.c: Likewise.
	* gcc.target/mips/call-5.c: Likewise.
	* gcc.target/mips/call-6.c: Likewise.
	* gcc.target/mips/lazy-binding-1.c: Likewise.
	* gcc.target/mips/near-far-1.c: Likewise.
	* gcc.target/mips/near-far-2.c: Likewise.
	* gcc.target/mips/near-far-3.c: Likewise.
	* gcc.target/mips/near-far-4.c: Likewise.
	* gcc.target/mips/umips-branch-3.c: Ensure the test is
	run with compact branches allowed.
	* gcc.target/mips/compact-branches-1.c: New file.
	* gcc.target/mips/compact-branches-2.c: Likewise.
	* gcc.target/mips/compact-branches-3.c: Likewise.
	* gcc.target/mips/compact-branches-4.c: Likewise.
	* gcc.target/mips/compact-branches-5.c: Likewise.
	* gcc.target/mips/compact-branches-6.c: Likewise.
	* gcc.target/mips/compact-branches-7.c: Likewise.

Co-Authored-By: Andrew Bennett <andrew.bennett@imgtec.com>
From-SVN: r227385