mips.h (ISA_HAS_EXTS): New macro.

	* config/mips/mips.h (ISA_HAS_EXTS): New macro.
	* config/mips/mips.md (*ashr_trunc<mode>): Name the pattern
	combining an arithmetic right shift by more than 31 and a
	trunction.  Don't match for out-of-range shift amounts.  Set
	attribute mode to <MODE>.
	(*lshr32_trunc<mode>): Name the pattern combining a logical right
	shift by 32 and and a truncation.  Set attribute mode to <MODE>.
	(*<optab>_trunc<mode>_exts): New pattern for truncated right
	shifts by less than 32.
	(extv): Change predicate on first operand to accept registers.
	Change predicate of the other operands from immediate_operand to
	const_int_operand.  Expand exts when source is a register.
	(extzv): Change predicate of the constant operands from
	immediate_operand to const_int_operand.
	(extzv<mode>): Change predicate of the constant operands from
	immediate_operand to const_int_operand and no constraint. Also
	remove mode.
	(*extzv_trunc<mode>_exts): New pattern.

testsuite/
	* gcc.target/mips/truncate-2.c: New test.
	* gcc.target/mips/octeon-exts-1.c: New test.
	* gcc.target/mips/octeon-exts-2.c: New test.
	* gcc.target/mips/octeon-exts-3.c: New test.
	* gcc.target/mips/octeon-exts-4.c: New test.

From-SVN: r140009