mips-protos.h (mulsidi3_gen_fn): New typedef.

	* config/mips/mips-protos.h (mulsidi3_gen_fn): New typedef.
	(mips_mulsidi3_gen_fn): Declare new function.
	* config/mips/mips.c (mips_mulsidi3_gen_fn): New function.
	* config/mips/mips.md (<u>mulsidi3): Change condition to use
	mips_mulsidi3_gen_fn.  Use mips_mulsidi3_gen_fn to generate the
	insn.
	(<u>mulsidi3_64bit): Don't match for ISA_HAS_DMUL3.
	(mulsidi3_64bit_dmul): New define_insn.

testsuite/
	* gcc.target/mips/mult-1.c: Forbid octeon.
	* gcc.target/mips/octeon-dmul-3.c: New test.

From-SVN: r154410