[cfe-dev] The intrinsics headers (especially avx512) are too big. What to do about it?

[Demikhovsky, Elena via cfe-dev]

   >Indeed. It is not clear to me, however, that this situation is desirable. We
   >had a general policy that our intrinsics headers should generate generic IR
   >whenever possible, and if we've strayed from that, we should discuss that
   >first.

Let's take a look at this intrinsic:

static __inline__ __m512i __DEFAULT_FN_ATTRS
_mm512_mask_add_epi64 (__m512i __W, __mmask8 __U, __m512i __A, __m512i __B)
{
  return (__m512i) __builtin_ia32_paddq512_mask ((__v8di) __A,
             (__v8di) __B,
             (__v8di) __W,
             (__mmask8) __U);
}

The IR that should be generated:
%C = add <8 x double> %B, %A
%res = select <8 x i1> %mask, <8 x double> %C, %W

If we parse __builtin_ia32_paddq512_mask in CGBuiltin.cpp and generate IR there, will it help?

(Please do not consider my question as a general Intel solution. I just want to understand the problem.)

Thanks.

-  Elena

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