Re: [MiNT] libgem16: vs_color

["Helmut Karlowski" <helmut.karlowski@ish.de>]

Am 18.01.2010, 20:01 Uhr, schrieb Eero Tamminen <oak@helsinkinet.fi>:

> Is  VDI_PARAMS() some kind of an inline assembly macro, and what it does?

It is a simple macro:


#define VDI_PARAMS(a,b,c,d,e) \
  VDIPB vdi_params;         \
  vdi_params.control = a;   \
  vdi_params.intin   = b;   \
  vdi_params.ptsin   = c;   \
  vdi_params.intout  = d;   \
  vdi_params.ptsout  = e;


> I've seen a bug (on ARM) where (JIT-generated) assembly code violated

ARM is quite far away ...

> the ABI stack alignment constraints which broke the assumption gcc

What is ABI stack alignment?

> alignment on further function calls.  (gcc optimized alignment operation
> on stack buffer away because it "knew" stack to be aligned)

I had a similar thought, so I added a char onto the stack, but of course  
this doesn't change anything.

It is all gcc here! I simply included the vs_color from gemlib into the  
XaAES-source, so there is no magic of any kind.

--
Helmut Karlowski