recog: Improve parser for pattern new compact syntax

recog: Improve parser for pattern new compact syntax

Hi all,

this is to add support to the new compact pattern syntax for the case
where the constraints do appear unsorted like:

(define_insn "*<optab>si3_insn_uxtw"
  [(set (match_operand:DI 0 "register_operand")
        (zero_extend:DI (SHIFT_no_rotate:SI
         (match_operand:SI 1 "register_operand")
         (match_operand:QI 2 "aarch64_reg_or_shift_imm_si"))))]
  ""
  {@ [cons: =0, 2,   1]
     [      r,  Uss, r] <shift>\\t%w0, %w1, %2
     [      r,  r,   r] <shift>\\t%w0, %w1, %w2
  }
  [(set_attr "type" "bfx,shift_reg")]
)

Best Regards

  Andrea

gcc/Changelog

2023-09-20  Richard Sandiford  <richard.sandiford@arm.com>

	* gensupport.cc (convert_syntax): Updated to support unordered
	constraints in compact syntax.