[x264-devel] MSVC patch test results under MSVC 2013

[肖卫华]

 amcj

发自我的 iPad

在 2014-3-25，7:37，Steven Walters <kemuri9 at gmail.com> 写道：

> On Mon, Mar 24, 2014 at 3:37 PM, Jason Garrett-Glaser
> <darkshikari at gmail.com> wrote:
>>> As for performance, MSVC doesn't support inline assembly, so that might be
>>> one casuse for the lower performance.
>> 
>> I don't think that difference can be accounted for solely by such a
>> small factor. You could emulate it in gcc by turning
>> HAVE_X86_INLINE_ASM to 0 in osdep.h and see how it compares then.
>> 
>> Jason
> 
> Neither of the supplied patches properly account for all of MSVC
> behavior as a compiler, so there's no telling what performance is
> being lost there.
> Also, a lot of MSVC's optimization flags, that aren't controlled by
> -O2, aren't currently being set either, some is probably lost here
> too.
> 
> the MSVC version is clearly for x86, as indicated by the
> UnalignedStack flag, but what about the gcc version, is it x86 or
> x86_64?
> (Needing confirmation that similar enough things are being compared)
> 
> For the record, MSVC does support inline asm itself, but only on x86
> (not x86_64) and only in the Intel syntax.
> Since all of x264's inline asm is in the AT&T syntax, MSVC can't
> support it, even on x86.
> 
> I've been working on a patch to support MSVC better than the provided
> ones, but without seeing what the official release of update 2 has in
> store for everyone, I've not had the rush to finish it.
> 
> Steven
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