config.gcc: Add fused-madd.opt.

config.gcc: Add fused-madd.opt.

2015-07-06  Steve Ellcey  <sellcey@imgtec.com>

	* config.gcc <mips*-*-*>: Add fused-madd.opt.
	* config/mips/mips.opt (mfused-madd): Remove.
	* config/mips/mips.c (mips_rtx_costs): Update cost calculations.
	* config/mips/mips.h (TARGET_MIPS8000): New.
	(ISA_HAS_FP_MADD4_MSUB4): Remove.
	(ISA_HAS_FP_MADDF_MSUBF): Remove.
	(ISA_HAS_FP_MADD3_MSUB3): Remove.
	(ISA_HAS_NMADD4_NMSUB4): Remove.
	(ISA_HAS_NMADD3_NMSUB3): Remove.
	(ISA_HAS_FUSED_MADD4): New.
	(ISA_HAS_UNFUSED_MADD4): New.
	(ISA_HAS_FUSED_MADDF): New.
	(ISA_HAS_FUSED_MADD3): New.
	* config/mips/mips.md: (fma<mode>4) Change from insn to expand.
	(*fma<mode>4_madd3) New.
	(*fma<mode>4_madd4) New.
	(*fma<mode>4_maddf) New.
	(fms<mode>4) New.
	(*fms<mode>4_msub3) New.
	(*fms<mode>4_msub4) New.
	(fnma<mode>4) New.
	(*fnma<mode>4_nmadd3) New.
	(*fnma<mode>4_nmadd4) New.
	(fnms<mode>4) New.
	(*fnms<mode>4_nmsub3) New.
	(*fnms<mode>4_nmsub4) New.
	(*madd4<mode>) Modify to be unfused only.
	(*msub4<mode>) Modify to be unfused only.
	(*nmadd4<mode>) Modify to be unfused only.
	(*nmsub4<mode>) Modify to be unfused only.
	(*madd3<mode>) Remove.
	(*msub3<mode>) Remove.
	(*nmadd3<mode>) Remove.
	(*nmsub3<mode>) Remove.
	(*nmadd3<mode>_fastmath) Remove.
	(*nmsub3<mode>_fastmath) Remove.
	(*nmadd4<mode>_fastmath) Update condition.
	(*nmsub4<mode>_fastmath) Update condition.

From-SVN: r225468