@gsuberland @artemist @ryanc It would have been elegant architecture to use the GPRs, but physically it would have been a bad idea - the two live in very different parts of the chip. I talk about it in my video:
https://vimeo.com/450406346
k0 is a perfectly normal register. The only special thing is that for vector instructions, that ENCODING is used to mean "no mask". This is similar to how SP/BP/R12/R13 encodings meaning special things in MOD-R/M - the registers themselves aren't special.
Tom Forsyth
@TomF@mastodon.gamedev.place
Graphics coder and HW architect, previously at Muckyfoot, RAD Game Tools, Valve, Oculus, Intel, Rec Room and Riot.
mastodon.gamedev.place
Tom Forsyth
@TomF@mastodon.gamedev.place
Graphics coder and HW architect, previously at Muckyfoot, RAD Game Tools, Valve, Oculus, Intel, Rec Room and Riot.
mastodon.gamedev.place
@TomF@mastodon.gamedev.place
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Feb 15, 2026
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