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Re: The speed of the compiler, was: Re: Combine four insns

From: Diego Novillo <dnovillo at google dot com>
To: Toon Moene <toon at moene dot org>
Cc: Steven Bosscher <stevenb dot gcc at gmail dot com>, Bernd Schmidt <bernds at codesourcery dot com>, Eric Botcazou <ebotcazou at adacore dot com>, Richard Guenther <richard dot guenther at gmail dot com>, gcc-patches at gcc dot gnu dot org
Date: Mon, 09 Aug 2010 13:14:51 -0400
Subject: Re: The speed of the compiler, was: Re: Combine four insns
References: <4C5C20D0.5020105@codesourcery.com> <4C5C8F7C.6010509@codesourcery.com> <AANLkTi=tnhXOPPaG8JM_TNFScoPPefY0aWi_Zjth5Y46@mail.gmail.com> <201008071010.53419.ebotcazou@adacore.com> <4C5FEF18.7010504@codesourcery.com> <4C6011F7.5040904@moene.org> <AANLkTikmGYsk4DbTugpiKvJM+CNr3=2nzCj7RUG7dO7y@mail.gmail.com> <4C601691.1000303@moene.org> <4C601E08.4020303@google.com> <4C6035C2.9020505@moene.org>

On 10-08-09 13:07 , Toon Moene wrote:

Is this also true for C++ ? In that case it might be useful to curb
Front End optimizations when -O0 is given ...

Not really, the amount of optimization is quite minimal to non-existent.

Much of the slowness is due to the inherent nature of C++ parsing. There is some performance to be gained by tweaking the various data structures and algorithms, but no order-of-magnitude opportunities seem to exist.

Diego.

Follow-Ups:
- Re: The speed of the compiler, was: Re: Combine four insns
  - From: Toon Moene

References:
- Combine four insns
  - From: Bernd Schmidt
- Re: Combine four insns
  - From: Bernd Schmidt
- Re: Combine four insns
  - From: Richard Guenther
- Re: Combine four insns
  - From: Eric Botcazou
- Re: Combine four insns
  - From: Bernd Schmidt
- Re: Combine four insns
  - From: Toon Moene
- Re: Combine four insns
  - From: Steven Bosscher
- The speed of the compiler, was: Re: Combine four insns
  - From: Toon Moene
- Re: The speed of the compiler, was: Re: Combine four insns
  - From: Diego Novillo
- Re: The speed of the compiler, was: Re: Combine four insns
  - From: Toon Moene

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