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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.arch
Subject: Re: Short Vectors Versus Long Vectors
Date: Wed, 24 Apr 2024 02:47:59 -0000 (UTC)
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On Tue, 23 Apr 2024 19:25:22 -0600, John Savard wrote:

> After all, the reason the Cray I succeeded where the STAR-100 failed was
> that it had those big vector registers ...

Looking at an old Cray-1 manual, it mentions, among other things, sixty 
four 64-bit intermediate scalar “T” registers, and eight 64-element vector 
“V” registers of 64 bits per element. That’s a lot of registers.

RISC-V has nothing like this, as far as I can tell. Right at the top of 
the spec I linked earlier, it says:

    The vector extension adds 32 architectural vector registers,
    v0-v31 to the base scalar RISC-V ISA.

    Each vector register has a fixed VLEN bits of state.

So, no “big vector registers” that I can see? It says that VLEN must be a 
power of two no bigger than 2**16, which does sound like a lot, but then 
the example they give only has VLEN = 128.