sse4.2: first attempt at implementing mm_cmpestra

[masterchef2209]

sse4.2: first attempt at implementing mm_cmpestra

[masterchef2209]

please tell me if I am going in right direction in implementation of the function and generating test cases.
Thank You

[nemequ]

This is a good start. A lot of the issues I see right away are relatively minor, but hopefully they'll make the code a little easier to understand, which should make it easier to optimize in the future.

[masterchef2209]

Thank You for the review, it will take some time to go through all of this :)

[mr-c]

Feedback from https://github.com/nemequ/simde/pull/280/checks?check_run_id=662415340#step:5:17

[mr-c]

Almost there! Another issue from https://github.com/nemequ/simde/pull/280/checks?check_run_id=662532291#step:5:66

[mr-c]

That is odd, Travis CI hasn't seen the latest commit ..

[nemequ]

Excellent progress! I added some more comments, but don't get discouraged. These functions are definitely a bit of a pani to implement (which is a big part of why they're not implemented yet), and you're doing really well. I just want to be a bit pedantic about this first function since it's probably going to be a model for the others.

I've tried to explain the reasons for each change, but if there is anything you're not clear on please ask.

[nemequ]

The implementation looks good to me. As soon as you have the tests done we can merge it.

[masterchef2209]

The implementation looks good to me. As soon as you have the tests done we can merge it.

I am working on it, hopefully I will be able to finish it by today.
Thanks

[nemequ]

Closing in favor of #295