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Ran 14 May 2019 03:09PM UTC

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Committed 14 May 2019 03:01PM UTC coverage: 96.546% (+32.9%) from 63.676%

Job # 976.4

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push

travis-ci

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web-flow

Commit Message

Combine FIR filtering from dspbase and DSP.jl (#297)

* Combine FIR filtering from dspbase and DSP.jl

There were two identical functions, `_tdfilt!`, and `filt!` that both accomplished
FIR filtering. It turns out that the function in dspbase, `filt!` was faster,
and also allowed you to change the filter state to achieve, e.g., a steady state
step response. I therefore removed the implementation in `_tdfilt!` in favor of
`filt!`.

The one benefit that `_tdfilt!` had over `filt!` was a set of small-kernel
filtering functions with an unrolled loop. I have combined the functionality of
these small filter functions with `filt!`, while making these small filter
functions also accept some initial state.

Finally, I have added `muladd` in the direct form filtering kernels, where
possible. This makes a big performance difference for the unrolled loop kernel,
but for the other kernels it doesn't seem to matter much. However, it should
produce more accurate filtering results on platforms that support fma
instructions.

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