[flac-dev] [PATCH] for configure.ac

[lvqcl]

Erik de Castro Lopo wrote:

>>> -       echo "    SSE optimizations : ................... ${sse_os}"
>>> +       echo "    SSE enabled : ......................... ${sse_enabled}"
>
> I renamed sse_os to sse_enabled :-)


But --disable-sse doesn't _fully_ disable SSE.

--enable-sse does two things: defines FLAC__SSE_OS preprocessor
variable and adds "-msse2" to the list of compiler options.

When FLAC__SSE_OS is defined: libFLAC checks CPU for SSE support.
It is assumed that OS supports SSE.
When FLAC__SSE_OS is undefined: libFLAC checks CPU for SSE support.
If SSE is supported then libFLAC checks OS for SSE support.

But in both cases libFLAC usually uses SSE-accelerated code.