PR target/106564: pru: Optimize 64-bit sign- and zero-extend

PR target/106564: pru: Optimize 64-bit sign- and zero-extend

Add new patterns to optimize 64-bit sign- and zero-extend operations for
the PRU target.

The new 64-bit zero-extend patterns are straightforward define_insns.

The old 16/32-bit sign-extend pattern has been rewritten from scratch
in order to add 64-bit support.  The new pattern expands into several
optimized insns for filling bytes with zeros or ones, and for
conditional branching on bit-test.  The bulk of this patch is to
implement the patterns for those new optimized insns.

	PR target/106564

gcc/ChangeLog:

	* config/pru/constraints.md (Um): New constraint for -1.
	(Uf): New constraint for IOR fill-bytes constants.
	(Uz): New constraint for AND zero-bytes constants.
	* config/pru/predicates.md (const_fillbytes_operand): New
	predicate for IOR fill-bytes constants.
	(const_zerobytes_operand): New predicate for AND zero-bytes
	constants.
	* config/pru/pru-protos.h (pru_output_sign_extend): Remove.
	(struct pru_byterange): New struct to describe a byte range.
	(pru_calc_byterange): New declaration.
	* config/pru/pru.cc (pru_rtx_costs): Add penalty for
	64-bit zero-extend.
	(pru_output_sign_extend): Remove.
	(pru_calc_byterange): New helper function to extract byte
	range info from a constant.
	(pru_print_operand): Remove 'y' and 'z' print modifiers.
	* config/pru/pru.md (zero_extendqidi2): New pattern.
	(zero_extendhidi2): New pattern.
	(zero_extendsidi2): New pattern.
	(extend<EQS0:mode><EQD:mode>2): Rewrite as an expand.
	(@pru_ior_fillbytes<mode>): New pattern.
	(@pru_and_zerobytes<mode>): New pattern.
	(<code>di3): Rewrite as an expand and handle ZERO and FILL
	special cases.
	(pru_<code>di3): New name for <code>di3.
	(@cbranch_qbbx_const_<BIT_TEST:code><HIDI:mode>): New pattern to
	handle bit-test for 64-bit registers.

gcc/testsuite/ChangeLog:

	* gcc.target/pru/pr106564-1.c: New test.
	* gcc.target/pru/pr106564-2.c: New test.
	* gcc.target/pru/pr106564-3.c: New test.
	* gcc.target/pru/pr106564-4.c: New test.

Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>