‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Monday, December 9, 2019 3:39 AM, Richard Biener <richard.guent...@gmail.com> wrote:
> > I'm modifying the code trying to get complex double accepted as a valid > > type by the vectorizer. > > This is the first time I'm dealing with GCC source so I ask for some > > patience. > > Function mode_for_vector in gcc/stor-layout.c requires a new else-if for > > complex double. I cannot > > seem to find a header file where MIN_MODE_VECTOR_FLOAT and similar macros > > are defined. I expect > > a new MIN_MODE_COMPLEX_VECTOR_FLOAT to be defined in the same file as the > > existing similar macros. > > How do I go about making this change? > > You don't want to do it this way but map _Complex double to a vector > of 2 * n doubles instead. > Look into get_related_vectype_for_scalar_type where it alreday has > code to "change" the > scalar type into something that fits what we allow for vectors. > I need more guidance on how to proceed here. Function mode_for_vector is called by build_vector_type_for_mode. The latter is called by get_related_vectype_for_scalar_type, which you suggested to study for a preferred implementation. The code in mode_for_vector relies on the relationship that vector mode E_V2DFmode is composed of E_DFmode scalars. The complex argument has mode E_DCmode. Where should I create a relationship between E_V2DFmode and E_DCmode so that mode_for_vector returns the appropriate vector mode? The solution has to be general so that single precision float complex vectorization is also supported. Bert.
