feat: add math/base/special/fast/alpha-max-plus-beta-minf

[nakul-krishnakumar]

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• Adds math/base/special/fast/alpha-max-plus-beta-minf.

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Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/fast/alpha-max-plus-beta-minf	$\color{green}568/568$ $color{green}+100.00%$	$\color{green}43/43$ $color{green}+100.00%$	$\color{green}11/11$ $color{green}+100.00%$	$\color{green}568/568$ $color{green}+100.00%$

The above coverage report was generated for the changes in this PR.

[kgryte]

Hmm...I am wondering whether we would only f32 the return values. But then again, if we do that, then we run the risk of computed values potentially deviating from calling the main export. But then again, we are dealing with a "fast" API, so accuracy is traded for performance and we are not as constrained by ensuring consistent results.

In which case, because we are assuming 32-bit integer input, I suggest removing all the f32 wrappers apart from, e.g.,

return f32( x + y>>>1 );

Such that we perform a single rounding except at the very end. This applies only for these specialized APIs which assume integer inputs.

[nakul-krishnakumar]

Okay, that actually makes sense. Thank you for the review!

[kgryte]

@anandkaranubc Would you be up for giving this a review?