[FFmpeg-devel] [PATCH] x86/synth_filter: Revert the switch to float ops with SSE2

Michael Niedermayer michaelni at gmx.at
Sun Mar 2 12:27:03 CET 2014

On Sat, Mar 01, 2014 at 11:46:27PM -0300, James Almer wrote:
> This reverts the changes 64672098361361cd15d37e36f747ab44de5b80ca
> and 68c3ed936a76c3ff7738f602fa90237ac7e3ce08 did to the SSE2 version, 
> which generated a hit of about 5 cycles.
> Signed-off-by: James Almer <jamrial at gmail.com>
> ---
> I screwed up my earlier tests and only measured the SSE performance vs the 
> SSE2 performance of the function post SSE implementation, rather than testing
> SSE2 pre vs SSE2 post to see if the switch from pxor to xorps and pshufd to 
> shufps had any negative effect.



Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Awnsering whenever a program halts or runs forever is
On a turing machine, in general impossible (turings halting problem).
On any real computer, always possible as a real computer has a finite number
of states N, and will either halt in less than N cycles or never halt.
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