a question about the whirl node instruction.

[Peng Zhao <pengzhao@xxxxxxxxxxxxxx>]

HI,

        I have some question about the meaning of the instructions of the
whirl IR, e.g. following is one line taken from the result of 
"ir_b2a xxx.I", it simplements "i++"

        ...
      LOC 1 19
        I4I4LDID  0  <2,2,i> T<4, .predef_I4, 4>
        I4INTCONST 1 (0x1)
        I4ADD
      I4STID 0 <2,2,i> T<4, .predef_I4, 4>
        ...
        
        what is the meaning of <2,2,i>, T<4, .predef_I4, 4>, I4I4 , "LOC 1
19"?
        Although I can guess something, it is still not very clear to me.
        
        Can somebody tell me the meaning of these fields explicitly and 
the rule to diciper them? I cannot find the description of them in the
Whirl specificatoin.
        


        Thank you very much.

        BTW: It seems to me that there is a little bug in the LOC(source
position information) related
things in ir_b2a. Sometimes, the LOC appears before the other codes of the
same whirl node, but sometimes it appears behind them. It is somewhat
confusing.

                                          Peng
--
  Peng Zhao   pengzhao@xxxxxxxxxxxxxx   
  http://www.cs.ualberta.ca/~pengzhao   
  TEL (Lab): (780)492-3725                  Lab:  CSC251