[sdcc-devel] [ sdcc-Bugs-1090994 ] peephole optimizer rules

[SourceForge.net <no...@so...>]

Bugs item #1090994, was opened at 2004-12-24 20:37
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=1090994&group_id=599

Category: assembler
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: peephole optimizer rules

Initial Comment:
The format of a rule file is like this :-


    replace
    {
       mov dpl,%1
       mov dph,(%1 + 1)
    }
    by
    {
       ; peephole custom rule, use DPTR as a single 
register.
       mov dptr,#%1
    }

This tells the optimizer to change all the inefficient 
mov's to the single mov. It also places the comment in 
the file so you know why it is there. There are various 
other options you can put in the file, which are all fully 
covered in the manual. Be warned You can easily wreck 
things by using custom rules which cause bugs in your 
program. The compiler doesn't check you have done 
something stupid. so...

Then how i decrement data pointer in my program?
The below one is also not available-
DEC DPTR

Then how i should manage this ,pleas help me.

with warm regards

-sun

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=1090994&group_id=599