[theora-dev] Issues with Win32 MMX code

Ralph Giles giles at xiph.org
Tue Feb 3 14:24:55 PST 2009

On Tue, Feb 3, 2009 at 1:07 PM, John Ridges <jridges at masque.com> wrote:
> It seems a reasonable solution for the VC compiler, but seeing as this
> code is very
> unlikely to change in the future it seems a shame to force a performance
> hit on the
> GCC version because of a Microsoft bug.

The MSVC assembly has always been separate, because the two compilers
have incompatible inline assembly syntax. As I understand the
proposal, only the dec/x86_vc files would be converted to intrinsics.
This is expected to generate slower code, but avoid the MSVC code
generation bug. GCC output would be unchanged.


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