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#1021 Updates FIR filter to use the java Math.fma floating point multiply and accumulate instruction for more efficient processing. (#1022)

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Co-authored-by: Denny <denny@denny-desktop>
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Denny Sheirer
2020-12-27 06:48:37 -05:00
committed by GitHub
parent f0d9ef99ea
commit 2847dff64a
1 changed files with 2 additions and 1 deletions
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src/main/java/io/github/dsheirer/dsp/filter/fir/real/RealFIRFilter2.java
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@@ -85,7 +85,8 @@ public class RealFIRFilter2 extends FIRFilter
//Use vector dot product to leverage SIMD intrinsics //Use vector dot product to leverage SIMD intrinsics
for(int x = 0; x < mCoefficients.length; x++) for(int x = 0; x < mCoefficients.length; x++)
{ {
mAccumulator += mData[x] * mCoefficients[x]; //Note: Math.fma() is 2.5x faster than explicit multiply then accumulate
Math.fma(mData[x], mCoefficients[x], mAccumulator);
} }
/* Apply gain and return the filtered value */ /* Apply gain and return the filtered value */