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Re: An unusual Performance approach using Synthetic registers, and a request for guidance.

From: "Bonzini" <bonzini at gnu dot org>
To: "Andy Walker" <ja_walker at earthlink dot net>,<gcc at gcc dot gnu dot org>
Date: Sun, 29 Dec 2002 10:47:39 +0100
Subject: Re: An unusual Performance approach using Synthetic registers, and a request for guidance.
References: <000701c2ad9e$a85adbc0$ec111897@bonz> <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

Follow-Ups:
- Re: An unusual Performance approach using Synthetic registers, and a request for guidance.
  - From: Andy Walker

References:
- Re: An unusual Performance approach using Synthetic registers, and a request for guidance.
  - From: Bonzini
- Re: An unusual Performance approach using Synthetic registers, and a request for guidance.
  - From: Andy Walker

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