[fpc-devel] Problems with MM types (__m128 etc).
J. Gareth Moreton
gareth at moreton-family.com
Wed Apr 6 21:24:15 CEST 2022
Pascal simply is a strongly typed language. Vector intrinsics are no
reason to weaken this. Thus you need to declare operator overloads that
hide the nitty, gritty details of assigning a TVector4 to a __m128, e.g.:
>
> type
> TVector4 = packed record
> X, Y, Z, W: Single;
> class operator := (const aArg: TVector4): __m128;
> class operator := (const aArg: __m128): TVector4;
> end;
>
> Regards,
> Sven
That's true - I'm still learning when an implicit typecast is valid and
when it isn't. In the above example, __m128(some_TVector4_type), is
usually valid because the alignments and memory are the same.
Internally though, the __m128 types are broken in a few places.
Gareth aka. Kit
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