[opus] Patch cleaning up Opus x86 intrinsics configury

[Viswanath Puttagunta]

Hello Jonathan,

I am unable to apply your patch cleanly on tip.

Timothy/opus-dev,

This patch has some conflicts with my ARM patch that does fft optimizations
http://lists.xiph.org/pipermail/opus/2015-March/002904.html
http://lists.xiph.org/pipermail/opus/2015-March/002905.html

One of us probably has to rebase depending on which patch goes into opus first.

Regards,
Vish


On 1 March 2015 at 20:47, Jonathan Lennox <jonathan at vidyo.com> wrote:
> The attached patch cleans up Opus's x86 intrinsics configury.
>
> It:
> * Makes —enable-intrinsics work with clang and other non-GCC compilers
> * Enables RTCD for the floating-point-mode SSE code in Celt.
> * Disables use of RTCD in cases where the compiler targets an instruction
> set by default.
> * Enables the SSE4.1 Silk optimizations that apply to the common parts of
> Silk when Opus is built in floating-point mode, not just in fixed-point
> mode.
> * Enables the SSE intrinsics (with RTCD when appropriate) in the Win32
> build.
> * Fixes a case where GCC would compile SSE2 code as SSE4.1, causing a crash
> on non-SSE4.1 CPUs.
> * Allows configuration with compilers with non-GCC-flavor flags for enabling
> architecture options.
> * Hopefully makes the configuration and ifdef’s easier to follow and
> understand.
>
> This does not yet switch —enable-intrinsics to be enabled by default on
> supported architectures, but I think it’d be ready to do so.
>
> Comments are welcome!
>
>
>
> —
> Jonathan Lennox
> jonathan at vidyo.com
>
>
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