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Re: [GCC 3.0] Bad regression, binary size

To: Linus Torvalds <torvalds at transmeta dot com>
Subject: Re: [GCC 3.0] Bad regression, binary size
From: Paolo Carlini <pcarlini at unitus dot it>
Date: Mon, 09 Jul 2001 19:06:50 +0200
CC: gcc at gcc dot gnu dot org
References: <Pine.LNX.4.33.0107090905290.14024-100000@penguin.transmeta.com>

Hi,

Linus Torvalds wrote:

> Now, that report may obviously have been bogus, of course. There may be
> something else going on. Linux uses "-mpreferred-stack-boundary=2" exactly
> because the default behaviour of newer gcc's is very much suboptimal
> (certainly for the kernel, and I will bet that it is for most applications
> compiled with gcc).

The "flops" benchmark (f.i., http://ftp.sunet.se/pub2/benchmark/aburto/flops/)
clearly demostrates this point: just try building it with 3.0.x with and
without -mpreferred-stack-boundary=2. The difference is impressive.

My two cents,
Paolo Carlini.

References:
- Re: [GCC 3.0] Bad regression, binary size
  - From: Linus Torvalds

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