On Thu, 27 Sep 2001, Jeethu Rao wrote:

> Hey Scott, are you doing this for SDCC,
> Since shifts are very essential in C ?
> I just got this thought now!

:).

void shift_left_var(void)
{

  achar0 <<= achar1;
}

produces:

(copious debugging junk left in...)

;_shift_left_var:
_shift_left_var ;Function start
; 1 exit point
;;ic
;;      rotate2.c 25
;; ***  resultRemat  2320
;; ***  genLeftShift  6032
;;      607
;;      630 - true symop
;; ***  aopForSym 341
;;      427 sym->rname = _achar1, size = 1
;mov    b,_achar1
;inc    b
;;      607
;;      630 - true symop
;; ***  aopForSym 341
;;      427 sym->rname = _achar0, size = 1
;;      607
;;      623
        SWAPF   _achar0,W
        ANDLW   0xf0
        BTFSS   _achar1,2
        MOVF    _achar0,W
        MOVWF   _achar0
        BTFSS   _achar1,0
        ADDWF   _achar0,F
        RLF     _achar0,W
        ANDLW   0xfe
        ADDWF   _achar0,W
        BTFSC   _achar1,1
        ADDWF   _achar0,F

Yes I'm doing this for SDCC. This code has been tested in the regression
suite as well.

I thought about posting the snippets for shifting by a constant amount
too.

Scott

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