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From: mitchalsup@aol.com (MitchAlsup1)
Newsgroups: comp.arch
Subject: Re: Tonights Tradeoff
Date: Sat, 7 Sep 2024 14:41:14 +0000
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On Sat, 7 Sep 2024 2:27:40 +0000, Robert Finch wrote:

> Making the scalar register file a subset of the vector register file.
> And renaming only vector elements.
>
> There are eight elements in a vector register and each element is
> 128-bits wide. (Corresponding to the size of a GPR). Vector register
> file elements are subject to register renaming to allow the full power
> of the OoO machine to be used to process vectors. The issue is that with
> both the vector and scalar registers present for renaming there are a
> lot of registers to rename. It is desirable to keep the number of
> renamed registers (including vector elements) <= 256 total. So, the 64
> scalar registers are aliased with the first eight vector registers.
> Leaving only 24 truly available vector registers. Hm. There are 1024
> physical registers, so maybe going up to about 300 renamable register
> would not hurt.

Why do you think a vector register file is the way to go ??