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Are long doubles with different implementations supported? #3931

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AlexGuteniev opened this issue Aug 7, 2023 · 2 comments
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Are long doubles with different implementations supported? #3931

AlexGuteniev opened this issue Aug 7, 2023 · 2 comments
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@AlexGuteniev
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MSVC supports float, double and long double but long double is the same as double.

However with classic FPU instructions, x86 provides a native support for a more precise type than the usual double. Some implementations may use that as underlying implementation of long double. MSVC doesn't, but maybe Intel Compiler or Clang or CUDA has a switch for that support.

Does such a switch exist? Do we need to support that?

The question is for #3928 , where I assume that long double is the same as double. The vector algorithm may return a totally wrong pointer for array of long doubles of different implementation.
@AlexGuteniev AlexGuteniev added the question Further information is requested label Aug 7, 2023
@sylveon
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sylveon commented Aug 7, 2023

No, see #1316

@AlexGuteniev
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No, see #1316

Thanks, I forgot about that precedent

AlexGuteniev added a commit to AlexGuteniev/STL that referenced this issue Aug 7, 2023
@AlexGuteniev
Unsupport 80-bit long double
46baf22 
See microsoft#3931
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