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Re: Using a DFA for insn-recog.c

From: Andi Kleen <andi at firstfloor dot org>
To: Andrew Pinski <pinskia at gmail dot com>
Cc: gcc-patches at gcc dot gnu dot org, rsandifo at nildram dot co dot uk
Date: Fri, 02 May 2008 22:26:07 +0200
Subject: Re: Using a DFA for insn-recog.c
References: <87myn9ax46.fsf@firetop.home> <87bq3ovas5.fsf@basil.nowhere.org> <de8d50360805021242g4da9c49bsfa62f5414ae89c5a@mail.gmail.com>

Andrew Pinski wrote:
> On Fri, May 2, 2008 at 11:08 AM, Andi Kleen <andi@firstfloor.org> wrote:
>> And usually for the larger lower level caches d and i is shared anyways.
> 
> Which lower level cache are you talking about? L1? L2?

L2 and lower.

> For all the platforms (PPC) I works on, L1 caches are split between D
> and I caches while the L2 are shared.

L1 (both d and i) tends to be so small that you'll thrash it always on
compiler execution. The interesting area are the lower level caches.

-Andi

References:
- Using a DFA for insn-recog.c
  - From: Richard Sandiford
- Re: Using a DFA for insn-recog.c
  - From: Andi Kleen
- Re: Using a DFA for insn-recog.c
  - From: Andrew Pinski

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