Is this what you want ?

        movlw   amount_to_shift
        movwf   y
shiftit
        rlf x, f
        decfsz y, f
        goto shiftit

nextcode


Bye.

-----Original Message-----
From: Scott Dattalo [mailto:scott@DATTALO.COM]
Sent: Wednesday, 26 September 2001 16:01
To: PICLIST@MITVMA.MIT.EDU
Subject: Challenge: Shifting by a variable amount


In C:

  unsigned  char x;
  unsigned  char y;

 ...

  x <<= y;

How would you do this in PIC assembly?

This has been discussed here before (but I couldn't find it in the
archives) and IIRC a 12 cycle solution was found (by Dmitry?). I've got a
12-cycle solution, but thought it would be interesting to propose this as
a challenge. (The winner may simply find the answer in the archives :).

Scott

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.