Implement all MSA Intrinsics

[rbirdic]

Fixes #170

[gnzlbg]

This needs a thorough review, but two things stand out:

• the msa module should use newtype vector types instead of re-exporting the ones from the simd module
• this is not built in CI AFAICT, so this will need at least CI that builds with msa enabled (a qemu build job that runs the tests on CI can be added in a subsequent PR though)

[gnzlbg]

This is looking really good, thank you for working on this.

Do you think you would be able to add a couple of buildjobs that build the library with -C target-feature=+msa enabled ? That way we can at least ensure that this compiles and that we don't break it. Ideally, we would be able to run the tests under qemu as well, but that can be done in a follow up PR.

[rbirdic]

@gnzlbg Can I repurpose existing MIPS buildjobs for that or do I need to add new ones?

[gnzlbg]

You can repurpose them, by adding a case for mips here (https://github.com/rust-lang-nursery/stdsimd/blob/master/ci/run.sh#L64) and then enabling MSA.

I think you might want to add new build jobs for the new r6 targets though.

[rbirdic]

I think you might want to add new build jobs for the new r6 targets though.

Rustc changes which provide mips r6 support have been recently added (1.35-nightly). I don't think there is rustup target for mipsisa64r6*-unknown-linux-gnuabi64 available.

[gnzlbg]

@rbirdic rustup is not required, you can use xargo to recompile core for those targets, the thumb..., ptx, and gba build jobs do just that.

[wzssyqa]

@rbirdic in ci/run.sh, you seem not taking care about r6:
mipsisa{32,64}r6{,el}

[gnzlbg]

@wzssyqa a *mips*) case should be enough for that

[gnzlbg]

So this looks good enough to merge for me. Build jobs for the r6 targets can be added later.

[rbirdic]

@wzssyqa

@rbirdic in ci/run.sh, you seem not taking care about r6:
mipsisa{32,64}r6{,el}

You're right, I somehow missed it.

[gnzlbg]

How soon do you need these intrinsics on nightly Rust?

I would be more comfortable if we were to set up running the run-time tests on CI before landing these upstream.

[rbirdic]

I am ok with adding test first.

[gnzlbg]

@rbirdic I've opened a PR with some fixes #711 , we missed that all APIs here are private, and are not exposed by the library :D