config.gcc (supported_defaults): Add madd4.

config.gcc (supported_defaults): Add madd4.

gcc/
2017-01-19  Matthew Fortune  <matthew.fortune@imgtec.com>
	    Yunqiang Su  <yunqiang.su@imgtec.com>

	* config.gcc (supported_defaults): Add madd4.
	(with_madd4): Add validation.
	(all_defaults): Add madd4.
	* config/mips/mips.opt (mmadd4): New option.
	* gcc/config/mips/mips.h (OPTION_DEFAULT_SPECS): Add a default for
	mmadd4.
	(TARGET_CPU_CPP_BUILTINS): Add builtin_define for
	__mips_no_madd4.
	(ISA_HAS_UNFUSED_MADD4): Gate with mips_madd4.
	(ISA_HAS_FUSED_MADD4): Likewise.
	* gcc/doc/invoke.texi (-mmadd4): Document the new option.
	* gcc/doc/install.texi (--with-madd4): Document the new option.

gcc/testsuite/
2017-01-19  Matthew Fortune  <matthew.fortune@imgtec.com>

	* gcc.target/mips/madd4-1.c: New file.
	* gcc.target/mips/madd4-2.c: Likewise.
	* gcc.target/mips/mips.exp (mips_option_groups): Add ghost option
	HAS_MADD4.
	(mips_option_groups): Add -m[no-]madd4.
	(mips-dg-init): Detect default -mno-madd4.
	(mips-dg-options): Handle HAS_MADD4 arch upgrade/downgrade.
	* gcc.target/mips/mips-ps-type.c: Add -mmadd4 test option.
	* gcc.target/mips/mips-ps-type-2.c: Likewise.
	* gcc.target/mips/nmadd-1.c: Likewise.
	* gcc.target/mips/nmadd-2.c: Likewise.
	* gcc.target/mips/nmadd-3.c: Likewise.

Co-Authored-By: Yunqiang Su <yunqiang.su@imgtec.com>
From-SVN: r244676