[cc65] Macros in inline assembler

Hi!

I want to optimize some sha256 code, since I couldn't get the compiler
to generate some optmized code to speed up the hash computation.

So I'd like to unroll this loop:
=========
	/* Unpack the block into 64 32-bit words */
	for(t = 0; t < 16; ++t)	{
	  datap = &data[t<<2];
		W[t] = (((uint32)*datap) << 24) |
		       (((uint32)*++datap) << 16) |
		       (((uint32)*++datap) <<  8) |
		       ((uint32)*++datap); 
=========

and defined me a macro:

=========
#define swapCopyULong(INDEX) \
  __asm__( "lda _data+(" ## #INDEX ## "*16+3)\n" \
		 "sta _W+(" ## #INDEX ## "q*4)\n"               \
		 "lda _data+(" ## #INDEX ## "*16+2)\n"		\
		 "sta _W+"( ## #INDEX ## "*4+1)\n"		\
		 "lda _data+(" ## #INDEX ## "*16+1)\n"		\
		 "sta _W+( " ## #INDEX ## "*4+2)\n"		\
		 "lda _data+(" ## #INDEX ## "*16)\n"		\
		 "sta _W+(" ## #INDEX ## "*4+3)\n" )
=========

, that I call for each long:

=========
	swapCopyULong(0);
	swapCopyULong(1);
	...
=========

, but this doesn't work so far, because the macro parameter is
not expanded and the linker complains about unresolved externals
_data and _W .

Could I split the macro into 1 asm statement per line and pass
2 arguments to it? (data and INDEX or W and index)?
How do I access those vars? %v2, or so?

I also tried to write a ca65 macro in the inline assembly, but
I got complains, that it's not supported at this place?

Or is there a way to expand macro parameters within a string, so
I get something like sta _W+(3*4+3), which could be used as an
absolute address? (_W is a local var, but static as I understand it).

Thanks for any hint,
Andreas

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