Post by thread:Automatic register-bank handling (was: "Re: PIC St

Jason Harper <spam_OUTPICLISTTakeThisOuTMITVMA.MIT.EDU> wrote: > It appears that the PIC assembers' handling of register banks simply > sucks - the problems you're having (but not every such problem) could > have easily been detected by a simple data flow analysis pass in the > assembler. Jason: Unfortunately, an assembler that could catch SOME bank-selection problems -- or even "almost all" such problems -- would have only marginal utility. Unless the assembler were guaranteed to catch ALL bank-selection errors, users would be unable to trust that it was working and would STILL have to take manual steps to ensure that their register accesses were happening properly. I mean... I guess I can see that it might be useful to have an assembler that'd catch the really stupid mistakes like: MOVLW 00000000B MOVWF PORTA MOVWF TRISA but those can usually be found by leaving all the EXISTING assembler warnings turned on and writing macros for other-than-bank-0 register accesses. As I've said before, I don't think I'd trust an assembler to catch register-bank errors unless it could correctly flag the "CLRF TRISA" in the following (highly contrived) bit of code as an error: BCF STATUS,RP0 CLRF PORTA MOVLW PCL+1 MOVWF FSR DECF FSR DECF FSR,W ADDWF INDF NOP NOP BSF STATUS,RP0 CLRF TRISA -Andy === Andrew Warren - .....fastfwdKILLspam@spam@ix.netcom.com === Fast Forward Engineering - Vista, California === http://www.geocities.com/SiliconValley/2499