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Re: Enlarge MAX_ALLOCA?

From: Dmitry Antipov
Subject: Re: Enlarge MAX_ALLOCA?
Date: Fri, 20 Jun 2014 12:38:03 +0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

On 06/19/2014 10:21 PM, Stefan Monnier wrote:

64kB feels arbitrary.  I cannot really think of an architecture where
64kB would be feasible and 128kB not.  ±32kB is a plausible offset for
some architectures.

This has nothing to do with machine architectures.
It's only related to the OS chosen size of the stack.

IIUC this means that if alloca is limited to < 32K, stack may be expanded
with just one instruction because increment fits into an immediate operand.
Otherwise there should be a few more load/store/add instructions.


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