* config.gcc (mipsisa64*-*-linux*): New configuration.  Set ISA
	to MIPS64r2 for mipsisa64r2*.
	* config/mips/mips.h (GENERATE_MIPS16E): Update comment.
	(ISA_MIPS64R2): New macro.
	(TARGET_CPU_CPP_BUILTINS, MULTILIB_ISA_DEFAULT): Handle it.
	(ISA_HAS_64BIT_REGS, ISA_HAS_MUL3, ISA_HAS_FP_CONDMOVE,
	ISA_HAS_8CC, ISA_HAS_FP4, ISA_HAS_PAIRED_SINGLE,
	ISA_HAS_MADD_MSUB, ISA_HAS_NMADD4_NMSUB4, ISA_HAS_CLZ_CLO,
	ISA_HAS_ROR, ISA_HAS_PREFETCH, ISA_HAS_PREFETCHX, ISA_HAS_SEB_SEH,
	ISA_HAS_EXT_INS, ISA_HAS_MXHC1, ISA_HAS_HILO_INTERLOCKS,
	ISA_HAS_SYNCI, MIN_FPRS_PER_FMT): Return true for ISA_MIPS64R2.
	(MIPS_ISA_LEVEL_SPEC, ASM_SPEC, LINK_SPEC): Handle -mips64r2.
	(TARGET_LOONGSON_2E, TARGET_LOONGSON_2F, TARGET_LOONGSON_2EF):
	Move up to keep list alphabetically sorted.
	(TUNE_20KC, TUNE_24K, TUNE_74K, TUNE_LOONGSON_2EF): Likewise.
	* config/mips/mips.c (mips_cpu_info_table): Add default MIPS64r2
	processor.
	* doc/invoke.texi (MIPS Options): Add -mips64r2.
	(-march=@var{arch}): Add mips64r2.

testsuite/

	* gcc.target/mips/ext-1.c: New test.

From-SVN: r138448