From: Mark Wooding <mdw@distorted.org.uk>
Date: Sat, 3 Feb 2024 23:02:22 +0000 (+0000)
Subject: base/asm-common.h, *.S: Use consistent little-endian notation for SIMD regs.
X-Git-Url: https://git.distorted.org.uk/~mdw/catacomb/commitdiff_plain/981a9e5d5e3af6c06ad8b3f821928852068227e4?hp=981a9e5d5e3af6c06ad8b3f821928852068227e4

base/asm-common.h, *.S: Use consistent little-endian notation for SIMD regs.

This makes operations which involve changing one's perspective about the
SIMD processing elements make significantly more sense.  In particular,
I hope that this removes a layer of brain-twisting from the GCM code.

  * Adjust all of the register-contents diagrams so that less
    significant elements are on the right, rather than on the left.

  * Change the x86 `SHUF' macro so that the desired pieces are listed in
    decreasing significance order, so `SHUF(3, 2, 1, 0)' would be a
    no-op.

I would, of course, continue to use big-endian notation on a target
which actually used a big-endian ordering natively, but we don't
currently support any of them.
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