[Bug 746661] audioconvert is slow on architectures without 64-bit integer divide (e.g. armv7)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746661

--- Comment #6 from Ilya Konstantinov <ilya.konstantinov at gmail.com> ---
On armv7, gst_audio_quantize_quantize_signed_tpdf_none is down to 0.5% from
23%.

I've just tested on arm64 -- gst_audio_quantize_quantize_signed_tpdf_none is
down to 0.5% from 1.0%.

I'd be surprised if shift + bitwise-and will be slower than integer division,
on any architecture.

What I'm more concerned about is correctness. Please have a look, and I'm also
waiting for Sebastian to have a look since he wrote this (back in 2007...).

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