(Answer) (Category) CGEN Faq-O-Matic :
dni format description
Hello,
My name is Petronela, i would like to get more info about the format field from pmacros. For example the following insn is used in m32r.cpu:
(dni addx "addx"
     ((PIPE OS) (IDOC ALU))
     "addx $dr,$sr"
     (+ OP1_0 OP2_9 dr sr)
     (parallel ()
               (set dr (addc dr sr condbit))
               (set condbit (add-cflag dr sr condbit)))
     ()
)
What (+ OP1_0 OP2_9 dr sr) means ? OP1_* and OP2_* are defined in the following way:
(define-normal-insn-enum insn-op1 "insn format enums" () OP1_ f-op1
  ("0" "1" "2" "3" "4" "5" "6" "7"
   "8" "9" "10" "11" "12" "13" "14" "15")
)
(define-normal-insn-enum insn-op2 "op2 enums" () OP2_ f-op2
  ("0" "1" "2" "3" "4" "5" "6" "7"
   "8" "9" "10" "11" "12" "13" "14" "15")
)
My understanding is that destination register is always R0 and source register is always R9 for this type of insn. Is this correct ? Does this not restrict the hardware usage ? Since this insn can be executed on all R* registers.
Thank you
petronela.silvia@gmail.com
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