RFA: 4.5 Branch: Import RX enhancements

[Nick Clifton <nickc at redhat dot com>]

Hi Guys,

  I would like permission from a Release Manager to check in the
  attached patch to the 4.5 branch prior to the generation of the 4.5.1
  release candidate.  The patch only affects the RX backend of GCC.  It
  imports the recent improvements made to the RX backend and its
  inclusion into the 4.5.1 release has been especially requested by
  Renesas.

  Checked with no regressions on an rx-elf target and with an i686
  bootstrap.

  OK to apply ?

Cheers
  Nick

gcc/ChangeLog
2010-07-27  Nick Clifton  <nickc@redhat.com>

	* Import this patch from the mainline:

	2010-06-30  Nick Clifton  <nickc@redhat.com>

	* config/rx/rx-modes.def: New file.
	* config/rx/rx.h (FIRST_PSEUDO_REGISTER): Increase to 17.
	(CC_REGNUM): Define.
	(FIXED_REGISTERS, CALL_USED_REGISTERS, REGISTER_NAMES): Add cc
	register.
	(CC_NO_CARRY, NOTICE_UPDATE_CC): Delete.
	(SELECT_CC_MODE): Define.
	* config/rx/rx.md (CC_REG): Define.  Update all patterns to use
	(reg:CC CC_REG) instead of (cc0).
	(attr "cc"): Delete.
	(cbranchsi4): Do not split compare and branch here. Instead move
	it to...
	(cbranchsi4_<code>): ... here.  New patterns.
	(cmpsi): Call rx-compare_redundant to find out if it is necessary
	to emit the compare instruction.
	* config/rx/rx.c (rx_gen-cond_branch_template): Remove tests of
	cc_status flags.
	(rx_get_stack_layout): Iterate up to before CC_REGNUM not
	FIRST_PSEUDO_REGNUM.
	(rx_expand_prologue, rx_expand_epilogue): Likewise.
	(rx_notice_update_cc): Delete.
	(rx_cc_modes_compatible): New function.
	(flags_needed_for_conditional): New function.
	(flags_from_mode): New function.
	(rx_compare_redundant): New function - scans backwards through
	insn list to find out if condition flags are already set correctly.
	(TARGET_CC_MODES_COMPATIBLE): Define.
	* config/rx/rx-protos.h (rx_compare_redundant): Prototype.

	* config/rx/rx.h (BRANCH_COST): Define.
	(REGISTER_MOVE_COST): Define.
	* config/rx/predicates (rx_source_operand): Allow all constant types.
	* config/rx/rx.md (addsi3): Add alternative for swapped operands.
	(tstsi4): New pattern.
	* config/rx/rx.c (rx_memory_move_cost): Define.
	(TARGET_MEMORY_MOVE_COST): Define.

Attachment: rx.cc0.gcc45.patch.bz2
Description: BZip2 compressed data