re PR target/54089 ([SH] Refactor shift patterns)

re PR target/54089 ([SH] Refactor shift patterns)

	PR target/54089
	* config/sh/predicates (p27_rshift_count_operand,
	not_p27_rshift_count_operand): New predicates.
	* config/sh/sh.c (sh_ashlsi_clobbers_t_reg_p,
	sh_lshrsi_clobbers_t_reg_p, sh_dynamicalize_shift_p): Handle special
	case when shift amount is 31.
	(gen_ashift): Emit gen_shlr instead of gen_lshrsi3_m.
	* config/sh/sh.md (ashlsi3_d): Set type to 'dyn_shift' instead
	of 'arith'.
	(ashlsi_c): Rename to shll.  Adapt calls to gen_ashlsi_c throughout
	the file.
	(lshrsi3): Remove clobber from expander.  Use shift_count_operand
	instead of nonmemory_operand predicate for second operand.  Add
	handling of case lshrsi3_n_clobbers_t.
	(lshrsi3_k): Use p27_rshift_count_operand for second operand.
	(lshrsi3_d): Make insn_and_split.  Split dynamic shift to constant
	shift sequences if beneficial.
	(lshrsi3_n): Make insn_and_split.  Split constant shift sequence to
	dynamic shift if beneficial.
	(lshrsi3_n_clobbers_t): New insn_and_split.
	(lshrsi3_m): Delete.

	PR target/54089
	* gcc.target/sh/pr54089-2.c: New.

From-SVN: r190603