Re: Tonights Tradeoff

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 ??