Ian Lance Taylor wrote: >> 1. If the functionality will be allowed in gcc at all >> >> 2. What info the target needs to be provided to make the choices it wants >> >> 3. What, if any, common code can be shared between the CPUs > > Since the ARM ABI apparently specifies something about volatile > bitfields, I think we ought to implement that.
Yes, we should. I am aware of real user demand for this feature as well. It's a competitive disadvantage for GCC not to have this feature. > I continue to think that a sane programmer would use a different > mechanism. C/C++ provides mechanisms for working with memory mapped > hardware. Bitfields are not one of those mechanisms. I think the ARM specification is pretty sensible, and would make a good cross-platform approach. Using bit-fields may not be portable at present, but it would sure be nice if it was; it maps directly onto how people think about memory-mapped peripherals. -- Mark Mitchell CodeSourcery m...@codesourcery.com (650) 331-3385 x713
