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Re: Compile performance of Linux kernels in mainline gcc

From: Scott Robert Ladd <coyote at coyotegulch dot com>
To: Giovanni Bajo <giovannibajo at libero dot it>
Cc: Andi Kleen <ak at suse dot de>, gcc at gcc dot gnu dot org
Date: Sat, 30 Oct 2004 08:27:12 -0400
Subject: Re: Compile performance of Linux kernels in mainline gcc
References: <20041030070951.GA18074@wotan.suse.de> <10d101c4be6b$84139330$46b92997@bagio>

Giovanni Bajo wrote:

While I do not necessarily agree, there have been some statements in the past
about ignoring the compile time regression at -O2. The idea is that 4.0
optimizes code much better (or: has many more optimizers) than 3.3, so we
should not care that much if compilation time goes up a little. (of course,
this does not affect 5000% regressions which are clearly bugs, etc.).

Why can commercial compilers produce faster code in less time? If their generated code is faster than GCC's, they are likely performing more optimizations, and therefore, by your logic, they should compile SLOWER than GCC.

But they don't.

--
Scott Robert Ladd
site: http://www.coyotegulch.com
blog: http://chaoticcoyote.blogspot.com

References:
- Compile performance of Linux kernels in mainline gcc
  - From: Andi Kleen
- Re: Compile performance of Linux kernels in mainline gcc
  - From: Giovanni Bajo

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