[fpc-devel] CMem allocator memory alignment experiment
sergei_gorelkin at mail.ru
Wed Nov 19 14:52:44 CET 2014
19.11.2014 15:16, Marco van de Voort пишет:
> In our previous episode, Mark Morgan Lloyd said:
>>>> introduces a very significant performance overhead;
>>> Linux also does this.
>> On some but by no means all platforms. I'm specifically trying to
>> highlight the fact that on SPARC, Solaris can fix alignment issues (at a
>> price) but Linux doesn't try to. I don't know to what extent there are
>> comparable issues on other platforms (in particular x86_64) for which
>> both Solaris and Linux are implemented.
> On PPC (603), Linux did, but netbsd didn't :-) Though that is 1.9.0 times
> experience and thus slightly dated.
On mips-linux, I observe no crashes when doing unaligned access with integer instructions, but it
still crashes upon unaligned access using floating-point instructions.
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