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Re: MS-Windows tester wanted for trunk

From: Eli Zaretskii
Subject: Re: MS-Windows tester wanted for trunk
Date: Tue, 16 Sep 2014 19:03:22 +0300

> Date: Tue, 16 Sep 2014 19:46:27 +0400
> From: Dmitry Antipov <address@hidden>
> CC: address@hidden
> On 09/16/2014 06:31 PM, Eli Zaretskii wrote:
> > So, as suggested by that page, I marked the callback functions in
> > w32font.c with '__attribute__((force_align_arg_pointer))', and then
> > Emacs comes up normally.  This attribute is available in GCC since
> > v4.2.
>  From GCC manual, as of 4.8:
> -mstackrealign
> Realign the stack at entry.

That's the other solution suggested by the URL I cited.  But it's too
expensive: it adds the realignment overhead to _every_ function call.
By contrast, the number of callback functions we have is quite small,
and even if we decorate all of them with force_align_arg_pointer
(which isn't strictly necessary, AFAIU, since most of them don't cons
Lisp data), that's just a handful of functions that are not

Is it possible to prevent this problem by using an intermediate local
variable with a suitable alignment (sorry if this is a silly question,
but I have only a very vague idea about alignment).

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