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Re: gcc optimization and stack allocation.

From: Falk Hueffner <hueffner at informatik dot uni-tuebingen dot de>
To: "Yang Ye" <leafyoung at yahoo dot com>
Cc: <gcc-help at gcc dot gnu dot org>, "'wei lei'" <wrag201 at hotmail dot com>
Date: Thu, 17 Jun 2004 11:25:39 +0200
Subject: Re: gcc optimization and stack allocation.
References: <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAAebvFnS24L0iO8cmxZFTW3AKBAAAQAAAAu6Ol5DnR20m1cQ5WFOEHJQEAAAAA@yahoo.com>

"Yang Ye" <leafyoung@yahoo.com> writes:

> Do you have any idea on this scenario: When gcc(3.3.3) allocating
> space for local varibles, e.g. a statement like 'char buf[256];',
> the allocated buffers in stack always come with some space filled in
> at the end. If choose higher optimization level, let's say gcc -O6,
> the spaced filled at the end are smaller. I searched quite a lot
> documents, cannot find the official reason.

There is no "official reason". This depends on various gcc internals
in a hard to predict way. The real question is: why do you care?

-- 
	Falk

References:
- gcc optimization and stack allocation.
  - From: Yang Ye

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