CGEN Faq-O-Matic :
dni format description
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
Using CGEN with cygwin