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Mail Archives: cygwin-developers/2001/10/22/23:12:15

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From: "Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
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Subject: Re: 1.3.4 status?
Date: Tue, 23 Oct 2001 13:15:25 +1000
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----- Original Message -----
From: "Christopher Faylor" <cgf AT redhat DOT com>
To: <cygwin-developers AT cygwin DOT com>
Sent: Tuesday, October 23, 2001 12:23 PM
Subject: Re: 1.3.4 status?


>
> It is possible that a function would call __chkstk when it needed to
> allocate space beyond a certain limit.  Not every function begins with
a
> call to __chkstk/alloca, though.

objdump shows a large number of calls to __chkstk - particularly in
functions using inline variables that are large. My 2c is that somewhere
in gcc there is a heuristic that says "over size x variables get
alloca'd". Now, AFAIK for i386 - win32 that doesn't make much sense -
with the exception of variables nested deep into a if/case statement
which are large && only one path is ever traversed per function call. In
that scenario it will save stack space. It'd be neat to test with it
turned off though. I wonder if there is a gcc option to do that?

Rob

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