It is super weird to me that PHMINPOSUW only exists in 128-bit regs. Since AVX/AVX2 pretend 256-bit regs are 2 128-bit regs, I would have assumed that all 128-bit ops would be in there for 256-bit registers as just two copies of the 128-bit op, but I guess not??
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So what actually happens in silicon here? Did they actually remove the minpos logic from just the high 128-bit lane of the 256-bit ALU, I guess? Or is that not how these things actually work in practice anymore, and it's actually something completely different?
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