RFA: MN10300: Add LIW and SETLB support

[Nick Clifton <nickc@redhat.com>]

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Hi Guys,

  Here is the next MN10300 patch.  This one adds support for the Long
  Instruction Word instructions and the SETLB and Lcc instructions.

  The new instructions are not enabled by default.  I am not exactly
  sure why this is, but I do remember that it was at the request of
  Mitsubishi when the work was being done.  So I have also created a new
  set of multilibs with the instructions enabled.

  Tested without regressions, both with and without the new instructions
  enabled, using an mn10300-elf toolchain.

  OK to apply ?

Cheers
  Nick

gcc/ChangeLog
2010-11-05  Nick Clifton  <nickc@redhat.com>

	* config/mn10300/mn10300.c (liw_op_names): New array.
	(mn10300_print_operand): Handle 'W' operand.
	(mn10300_encode_section_info): Call default_encode_section_info
	after mn10300 specific processing.
	(extract_bundle): New function: Extracts the components
	of a LIW instruction.
	(liw_op_uses_only_regs): New function.
	(check_liw_constraints): New function.
	(liw_candidate): New function.  Determines in the given insn is
	a suitable candidate for conversion into an LIW instruction.
	(mn10300_bundle_liw): New function.  Converts pairs of insns
	into single LIW instructions.
	(mn10300_bundle_lcc): New function.  Combines a MOV and an LCC
	instruction into a single LIW instruction.
	(mn10300_insert_setlb_lcc): New function.  Replaces a JUMP with
	an LCC instruction.
	(mn10300_scan_for_setlb_lcc): New function.  Look for small loops
	that can use the SETLB/LCC instruction pair.
	(scan_for_redundant_compares): New function.  Eliminates unnecessary
	compare instructions.
	(mn10300_reorg): New function.  Run MN10300 specific optimizations.
	(TARGET_MACHINE_DEPENDENT_REORG): Define.
	* config/mn10300/mn10300.opt (mliw): New command line option.
	Enables the generation of LIW instructions.
	(msetlb): New command line option.  Enables the generation of SETLB
	LCC instructions.
	* config/mn10300/t-mn10300 (MULTILIB_OPTIONS): Add mliw|msetlb.
	(MULTILIB_DIRNAMES): Add liw.
	* config/mn10300/mn10300.h (TARGET_CPP_CPU_BUILTINS): Add __LIW__ and
	__SETLB__.
	* config/mn10300/constraints.md (O): New constraint.
	* config/mn10300/mn10300.md (UNSPEC_LIW_1, UNSPEC_LIW_2,
	UNSPEC_LCC, UNSPEC_SETLB): New constants.
	(liw_bundling): New automaton.
	(liw): New attribute.
	(liw_op): New attribute.
	(movsi_internal): Add liw and liw_op attributes.
	(am33_addsi3, am33_subsi3, am33_andsi3, am33_iorsi3, am33_xorsi3,
	 cmpsi, am33_ashlsi3, am33_lshrsi3, am33_ashrsi3): Likewise.
	(udivmodsi4): Remove unnecessary expander.
	(am33_subsi3): Separate alternatives involving immediates.
	(am33_andis3, am33_iorsi3, am33_xorsi3, am33_ashlsi3,
	 am33_lshrsi3, am33_ashrsi3): Likewise.
	(cbranchsi4_post_reload): Remove anonymity.
	(cbranchsf4_post_reload): Likewise.
	(loop_integer_conditional_branch): New pattern.
	(loop_floating_conditional_branch): New pattern.
	(setlb): New pattern.
	(lcc): New pattern.
	(liw_1): New pattern.
	(liw_lcc): New pattern.
	(* doc/invoke.texi: Document new command line options -mliw and
	-msetlb.

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