2 bytes to word array variable - fastest way

[scrwld]

hello, i use this and work:

read I,b1.HIGHBYTE ' read byte type var from EEprom
read I+1,b1.LOWBYTE 'read byte type var from EEprom
TEmpDs18(L) = B1 'word array

[MikeWinston]

Well it turns out the more intuitive way is also a little faster. That is if I
have done this correctly.

I used [view] [program memory] in MPLab and counted the number of
instructions between the start and end labels.

This code was 18 lines:

 
StartTest:
  adcData.lowbyte[Index] = ADRESL
  adcData.lowbyte[Index+1] = ADRESH
EndTest:

This code was 16 lines:

 
StartTest:
  tempWord.highbyte = ADRESH
  tempWord.lowbyte = ADRESL
  adcdata[index] = tempword
EndTest:

So as long as I can afford the extra word variable, I will be using the
temp variable way...... unless someone else reveals a clever trick.

thanks all for your replies,
Mike -

[mister_e]

If ADRESH & ADRESL are consecutive SFR... then you could use

    @ADRESULT = ADRESL
    ADRESULT VAR WORD EXT

    MyArray VAR WORD [8]

Start:
    MyArray[0] = ADRESULT

But I doubt ADRESL/ADRESH are consecutive in many PIC.

[MikeWinston]

mister_e,
Thats a good trick. One to remember. And it only produces 9 lines of
instruction. But your right, the PIC I'm using (16F684), ADRESH/L are not
next to each other.

Actually, ACCON0 is after ADRESH. That would give you an interesting result.

thanks,
Mike -