Re: -O* Gives Different Results than Individual Optimizations?

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To: Mike Sullivan <mbsullivan@xxxxxxxxx>
Subject: Re: -O* Gives Different Results than Individual Optimizations?
From: Ian Lance Taylor <iant@xxxxxxxxxx>
Date: Mon, 12 Oct 2009 07:49:56 -0700
Cc: Alexey Salmin <alexey.salmin@xxxxxxxxx>, gcc-help@xxxxxxxxxxx
In-reply-to: <ca8f01c20910120054w25d64a2bp20e28e28ba7d1e5a@xxxxxxxxxxxxxx> (Mike Sullivan's message of "Mon\, 12 Oct 2009 03\:54\:14 -0400")
References: <ca8f01c20910112116l735427cak5a43aad31b8ee3fb@xxxxxxxxxxxxxx> <mcrpr8txemw.fsf@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <87a8dc10910120043ga5c1d62n9d2648c354fd2f0e@xxxxxxxxxxxxxx> <ca8f01c20910120054w25d64a2bp20e28e28ba7d1e5a@xxxxxxxxxxxxxx>
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux)

Mike Sullivan <mbsullivan@xxxxxxxxx> writes:

> There was another interesting question in that mail: is "-O1" flag
> something different from just combination of "-fsomething" flags?

Yes.

Ian

References:
- -O* Gives Different Results than Individual Optimizations?
  - From: Mike Sullivan
- Re: -O* Gives Different Results than Individual Optimizations?
  - From: Ian Lance Taylor
- Re: -O* Gives Different Results than Individual Optimizations?
  - From: Alexey Salmin

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