gcc optimization and stack allocation.

[Falk Hueffner]

"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