Import and extend c10/util/safe_numerics.h

[JacobSzwejbka]

🚀 The feature, motivation and pitch

Pytorch code referenced in title: https://github.com/pytorch/pytorch/blob/main/c10/util/safe_numerics.h

In #11217 we added a check for an overflow in nybtes. Rather then performing division every check itd be nicer if we had the faster checks in safe_numerics.h. There are probably other places in ET we should be checking for overflows like this.

safe_numerics.h currently only has int64 and uint64 so we'd need to extend it for size_t.

Could just write our own size_t form first and then resolve merging with pytorch/pytorch later.

cc @swolchok for suggesting it

Alternatives

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Additional context

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[Tanish2101]

I would Like to work on this @JacobSzwejbka

So where should be this feature implemented, means should I make a file inside "executorch/utils/" with the file name like "safe_numerics_extras.h" and inside this implement the feature?

As you said we should first try it in executorch and afterwards merge that feature to pytorch

Please let me know if I am heading in right direction.

[JacobSzwejbka]

Ah my bad @Tanish2101 I'll do better about monitoring issues in the future.

[Tanish2101]

Ah my bad @Tanish2101 I'll do better about monitoring issues in the future.

No problem.👍🏽 @JacobSzwejbka