Warning 216

[mlanglais]

Hi

I have written an isr. All was fine, but suddently, it pops me warning 216 [@MUL1616].

This is the code

[PCM programmer]

You need to post a compilable test program, showing all variable
declarations, #include, #fuses, etc., statements.

Also post your compiler version.

[Ttelmah]

The warning, is a 'classic'. It ties up with the PIC, not allowing reentrancy to a function (you can't call a function inside itself), and so, if a function is called inside an interrupt, then interrupts are disabled around the same function used outside the interrupt, with this warning being given.
The function concerned here, is the 16*16bit multiplier routine.
Your 'alternative' line, though it appears the same, will code totally differently. The compiler is 'smart' with regards to *128 (and any binary multiplication), and knows this can be replaced, with a seven bit left shift, when dealing with a 'constant'. Hence it does so. However, when dealing with the 'array', a standardised array access routine is used, which uses the multiplication code.
In fact the replacement, will be faster/smaller, and avoid the re-entrancy problem!.

Best Wishes