‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Thursday, January 9, 2020 8:42 AM, Richard Biener
<richard.guent...@gmail.com> wrote:
>
> As for the other question for testing you probably want to provide a
> OMP simd declaration
> of a function like
>
> _Complex double mycexpi (double);
>
> and make a testcase like
>
> void foo (_Complex double * __restrict out, double *in)
> {
> for (int i = 0; i < 1024; ++i)
> {
> out[i] = mycexpi (in[i]);
> }
> }
>
> or eventually with two output arrays and explicit __real/__imag
> processing. The real
> and main question is how is the OMP SIMD declaration of mycexpi looking like?
>
> So I'd completely side-step sincos() and GCCs sincos() ->
> __builtin_cepxi transform
> and concentrate on OMP SIMD of a function with the signature we need to
> handle.
>
> Richard.
I think what is required here is to attach either #pragma omp declare simd or
__attribute__ ((simd))
to the declaration of builtin cexpi. In gcc/builtins.def, some attributes are
provided during
creation of cexpi (line 656, call containing BUILT_IN_CEXPI). Attaching the
simd attributes to
function declarations is how sin, cos, and the other math functions were
handled in math-vector.h
glibc header file.
