tree 2775facf874762fff0d2f2fafacbbe2b70f07327
parent 5a76c7c8ee9a0afbeedb1c211db9224260404347
author Lasse Collin <lasse.collin@tukaani.org> 1407089292 +0300
committer Lasse Collin <lasse.collin@tukaani.org> 1407089292 +0300

liblzma: SHA-256: Optimize the way rotations are done.

This looks weird because the rotations become sequential,
but it helps quite a bit on both 32-bit and 64-bit x86:

  - It requires fewer instructions on two-operand
    instruction sets like x86.

  - It requires one register less which matters especially
    on 32-bit x86.

I hope this doesn't hurt other archs.

I didn't invent this idea myself, but I don't remember where
I saw it first.