From: Jurij Smakov <jurij@xxxxxxxxx>
Date: Sun, 23 Oct 2011 14:47:27 +0100
> On Sat, Oct 22, 2011 at 06:54:05PM -0400, David Miller wrote:
>>
>> Just let the compiler do it for you, please... the compiler absolutely cannot
>> optimize away a function that uses a volatile asm statement. And it absolutely
>> cannot make a function that clobbers %o7 a leaf function.
>
> That's not what I see. I tried writing up a patch for Ruby using this,
> and here's what I get:
>
> 1. Preprocessed source of cont.c contains flush_register_windows
> definition:
>
> # 219 "./include/ruby/defines.h"
> static void
> flush_register_windows(void)
> {
> asm __volatile__ ("flushw" : : : "o7");
> }
You can't put it in a header file, GCC will inline it. You have to
put it in a function in a seperate C file, and this is what I said to
do the other week in my original email.
You're only other option is to explicitly mark this
__attribute__((__noinline__))
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