Bulldozer?

By: Linus Torvalds (torvalds.delete@this.linux-foundation.org), June 21, 2008 12:23 pm
Room: Moderated Discussions
S. Rao (sonny@burdell.org) on 6/21/08 wrote:
>
>(Maybe I'm way off here, but here goes)
>
>Remember that thing called register renaming ?
>
>Why does the architected register File have anything to
>do with it?

You want to rename into a larger set of physical
registers, not into a smaller one. The latter is possible
but very very inconvenient (it is what you effectively
have to do if you are emulating a large register file
architecture on a CPU with a smaller register file: you
map the large register file into cache or some other
"secondary" register file, and then rename it all into the
smaller actual register file).

So even with renaming, you do care about the size of the
architected register file. A smaller architected register
file allows you more flexibility in choosing the size of
the actual hardware register file.

Linus
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