Use embedded broadcast to replicate constants for AVX512.

[Shark64]

Here is the minimal pull request. The only thing I've sneaked in this is switching `cmp reg, 0' to 'test reg, reg': while it's less important than years ago when only test/jcc was macrofused, it's still a byte shorter and looked ugly ;). Shouldn't create any problem, i think :D .

[pablodelara]

A few comments, thanks for the work!

[pablodelara]

Same as sha1_mb, these 2 need to be aligned to 64 bytes

[pablodelara]

This needs to be aligned to 64 bytes (same for MASK2 below)

[Shark64]

I didn't align PSHUFFLE_BYTE_FLIP_MASK because the 4 32bit constant above it are aligned to 64 bytes, so +4*32 bit makes it aligned to 16 bytes which is the natural size for the 128bit load. You're right about the transpose masks, better to keep them aligned to avoid a split-load.

[pablodelara]

I didn't align PSHUFFLE_BYTE_FLIP_MASK because the 4 32bit constant above it are aligned to 64 bytes, so +4*32 bit makes it aligned to 16 bytes which is the natural size for the 128bit load. You're right about the transpose masks, better to keep them aligned to avoid a split-load.

The problem is not the split-load. I got a seg fault because there are aligned load instructions that need this data to be 64-byte aligned.

[Shark64]

Oh, that's interesting, i didn't get any SEGFAULT when doing `make test'. Anyway now they should be aligned, is it working ok for you?

[pablodelara]

Now yes :) Will merge this soon, thanks!

[Shark64]

BTW, if you want i can also make a quick separate pull requests to use VPTERNLOG in SM3 for the boolean functions. It's such a nice instruction that it's a shame not to use it wherever possible ;)

[pablodelara]

If you promise it's a short one that you can send in the next few hours :P

[Shark64]

I'll give it a try :P

[pablodelara]

Code is now merged, thanks for the work @Shark64!