gnupic: Error [157] Can't evaluate expression
Subject:
Error [157] Can't evaluate expression
From:
Kevin Olalde ####@####.####
Date:
27 Aug 2001 19:04:21 -0000
Message-Id: <3B8A99B0.F5218CF9@home.com>
Hi, I'm trying to compile the below macro, but get the error in the subject
line. gpasm seems to be having trouble with this line:
IF ALIGNED&&!(Base&(1<<BIT)) ; aligned ?
Is there something here that's not supported?
Thanks,
ko
;+++++
; INC_BUFFER advance buffer pointers wrap if necessary
;
; If buffer size is power of two, and buffer is aligned
; on an multiple of twice it size, this macro generates
; two instructions, Otherwise it generates six instructions.
; Originator: Eric Smith, ####@####.#### for non-comercial use.
INC_BUFFER MACRO Pointer, Base, Size
LOCAL POWER_OF2, ALIGNED,BIT,VALUE
POWER_OF2 SET !(Size&(Size-1)) ; calculate if power of 2
ALIGNED SET POWER_OF2&&((Base&(Size-1))==0) ; calculate if aligned
IF ALIGNED
VALUE SET Size
BIT SET 0
WHILE VALUE>1
BIT SET BIT+1
VALUE SET VALUE>>1
ENDW
ENDIF
INCF Pointer,F ; increase pointer
IF ALIGNED&&!(Base&(1<<BIT)) ; aligned ?
BCF Pointer,BIT ; yep clear bit
ELSE
MOVF Pointer,W ; nope
XORLW Base+Size
MOVLW Base
BTFSC STATUS,Z
MOVWF Pointer
ENDIF
ENDM
