Vec256 Test cases (#42685)
Summary:
[Tests for Vec256 classes https://github.com/pytorch/pytorch/issues/15676](https://github.com/pytorch/pytorch/issues/15676)
Testing
Current list:
- [x] Blends
- [x] Memory: UnAlignedLoadStore
- [x] Arithmetics: Plus,Minu,Multiplication,Division
- [x] Bitwise: BitAnd, BitOr, BitXor
- [x] Comparison: Equal, NotEqual, Greater, Less, GreaterEqual, LessEqual
- [x] MinMax: Minimum, Maximum, ClampMin, ClampMax, Clamp
- [x] SignManipulation: Absolute, Negate
- [x] Interleave: Interleave, DeInterleave
- [x] Rounding: Round, Ceil, Floor, Trunc
- [x] Mask: ZeroMask
- [x] SqrtAndReciprocal: Sqrt, RSqrt, Reciprocal
- [x] Trigonometric: Sin, Cos, Tan
- [x] Hyperbolic: Tanh, Sinh, Cosh
- [x] InverseTrigonometric: Asin, ACos, ATan, ATan2
- [x] Logarithm: Log, Log2, Log10, Log1p
- [x] Exponents: Exp, Expm1
- [x] ErrorFunctions: Erf, Erfc, Erfinv
- [x] Pow: Pow
- [x] LGamma: LGamma
- [x] Quantization: quantize, dequantize, requantize_from_int
- [x] Quantization: widening_subtract, relu, relu6
Missing:
- [ ] Constructors, initializations
- [ ] Conversion , Cast
- [ ] Additional: imag, conj, angle (note: imag and conj only checked for float complex)
#### Notes on tests and testing framework
- some math functions are tested within domain range
- mostly testing framework randomly tests against std implementation within the domain or within the implementation domain for some math functions.
- some functions are tested against the local version. ~~For example, std::round and vector version of round differs. so it was tested against the local version~~
- round was tested against pytorch at::native::round_impl. ~~for double type on **Vsx vec_round failed for (even)+0 .5 values**~~ . it was solved by using vec_rint
- ~~**complex types are not tested**~~ **After enabling complex testing due to precision and domain some of the complex functions failed for vsx and x86 avx as well. I will either test it against local implementation or check within the accepted domain**
- ~~quantizations are not tested~~ Added tests for quantizing, dequantize, requantize_from_int, relu, relu6, widening_subtract functions
- the testing framework should be improved further
- ~~For now `-DBUILD_MOBILE_TEST=ON `will be used for Vec256Test too~~
Vec256 Test cases will be built for each CPU_CAPABILITY
Fixes: https://github.com/pytorch/pytorch/issues/15676
Pull Request resolved: https://github.com/pytorch/pytorch/pull/42685
Reviewed By: malfet
Differential Revision: D23034406
Pulled By: glaringlee
fbshipit-source-id: d1bf03acdfa271c88744c5d0235eeb8b77288ef8
