[Icc-mot] Inline asm quirks

[Edward Karpicz]

> Using v7.02...
>
> Local data used in inline assembly goes wrong when address calculation is 
> required. The simplest example follows:
>
> ;       asm("   adcb   %data[3]");
>    adcb   26,S[3]

Not only with local data. I of course would prefer more intelligent % in
inline asm, but inline ICC asm was always the same, it didn't handle
anything else than just replacing %variable to variable label if global or
N,s (or N,x in V6).
However I wonder how could inline asm handle for example %var1[var2]? Should
compiler add code to compute the address of var2-th
element of var1? Bad idea because % used not in the first line of inline asm
can break our inlined code. I'm talking about this:

       asm("   ...");
       asm("   ...");
       asm("   ...");
 compiler putting here % support code can break our code.
      asm("  xx  %yy");




In your example, if data is char[] then I would write it this way

   asm("   adcb  3+%data");  // this should work and compile to

adcb  3+26,S


>
> Any pointer variable generates similar output, where the value is added to 
> the stack pointer reference rather than the offset.
>
> ;       asm("   adcb   %data_ptr->uc[1]");
>    adcb   9,S->uc[1]
>

This your code can't fit single asm line.

    "adcb  %data_ptr->uc[0]"   could be something like "adcb  [9,S]"

but there's no single line solution for

     adcb   %data_ptr->uc[1]



Edward

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