From: "Bonzini" <bonzini@gnu.org>
To: "Andy Walker" <ja_walker@earthlink.net>, <gcc@gcc.gnu.org>
Subject: Re: An unusual Performance approach using Synthetic registers, and a request for guidance.
Date: Sun, 29 Dec 2002 06:09:00 -0000 [thread overview]
Message-ID: <000901c2af1f$59a1d420$811b1897@bonz> (raw)
In-Reply-To: <E18SV9r-0007DL-00@grebe.mail.pas.earthlink.net>
> Orthogonality? I am sorry. I do not understand. Could you be a bit more
> descriptive?
The lack of memory-to-memory move instructions, for example. Synthetic
registers would have to be moved inside the core to do arithmetic on them.
It's already a problem not to have three-operand math, synthetic registers
would make the x86 basically an accumulator-based chip (move from reg to
accumulator, sum accumulator to reg) and also limit the ability to use LEA
to do arithmetics.
Paolo
next prev parent reply other threads:[~2002-12-29 9:57 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-27 6:48 Bonzini
2002-12-27 20:07 ` Dave Hudson
2002-12-29 2:23 ` Andy Walker
2002-12-29 1:57 ` Andy Walker
2002-12-29 6:09 ` Bonzini [this message]
2002-12-29 12:04 ` Andy Walker
-- strict thread matches above, loose matches on Subject: below --
2002-12-27 5:04 Andy Walker
2002-12-27 10:55 ` Michael S. Zick
2002-12-27 11:44 ` Michael S. Zick
2002-12-28 4:58 ` Alexandre Oliva
2002-12-28 9:43 ` Michael S. Zick
2002-12-29 5:33 ` Andy Walker
2002-12-29 4:28 ` Andy Walker
2002-12-29 2:18 ` Andy Walker
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