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Re: Simplifying specing/testing/implementation work

From: Raymond Toy <rtoy@google.com>
Date: Thu, 19 Jul 2012 09:44:30 -0700
Message-ID: <CAE3TgXE=rXesTavgqZzsbgmD5ZsSjFCmqz2bOMUwe4j4c6P_Vg@mail.gmail.com>
To: Jussi Kalliokoski <jussi.kalliokoski@gmail.com>
Cc: Marcus Geelnard <mage@opera.com>, public-audio@w3.org
On Thu, Jul 19, 2012 at 7:11 AM, Jussi Kalliokoski <
jussi.kalliokoski@gmail.com> wrote:

> Obviously SIMD code is faster than addition in JS now, for example. And
> yes, IIR filter is a type of a convolution, but I don't think it's possible
> to write an efficient IIR filter algorithm using a convolution engine 
> after all, a convolution engine should be designed to deal with a FIRs. Not
> to mention that common IIR filters have 4 (LP, HP, BP, N) kernels, which
> would be really inefficient for a FastConvolution algorithm, even if it
> supported FIR. And as far as IIR filter performance goes, I think SIMD
> instructions offer very little usefulness in IIR algorithms, since they're
> so linear.
 https://bugs.webkit.org/show_bug.cgi?id=75528 says that adding SIMD gives
a 45% improvement.

Received on Thursday, 19 July 2012 16:44:58 UTC

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