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Fix conversion from simd8f to simd8i for MSVC ARM on Windows #3039

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Fix conversion from simd8f to simd8i for MSVC ARM on Windows #3039

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5 changes: 5 additions & 0 deletions dlib/simd/simd8f.h
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Original file line number Diff line number Diff line change
Expand Up @@ -106,8 +106,13 @@ namespace dlib
inline operator simd8i::rawarray() const
{
simd8i::rawarray temp;
#if defined(DLIB_HAVE_NEON)
temp.low = simd4i(vcvtq_s32_f32(_low));
temp.high = simd4i(vcvtq_s32_f32(_high));
#else
Comment on lines +109 to +112
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What happens exactly? It seems like this shouldn't be needed, since simd4f (which is what _low and _high are) has this already: inline operator int32x4_t() const { return vcvtq_s32_f32(x); }. And then simd4i has has this constructor as well inline simd4i(const int32x4_t& val):x(val) {}. So this change shouldn't be needed. But I guess visual studio is throwing some error? What's the error exactly?

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You are completely right. For whatever reason the operator inline operator int32x4_t() was missing on my side. Actually it compiled just fine, only it resulted in a crash at runtime in fhog.h. I will close this pull request.

temp.low = simd4i(_low);
temp.high = simd4i(_high);
#endif
return temp;
}

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