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Optimization: avoid cvtsd2ss instructions by using explicit floating point litterals. Spectrum histogram calculation optimization

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This commit is contained in:
f4exb
2015-10-09 03:59:28 +02:00
parent 7a798f7dbf
commit 7742c0de2d
7 changed files with 10 additions and 9 deletions
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sdrbase/dsp/spectrumvis.cpp
+2 -2
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@@ -82,7 +82,7 @@ void SpectrumVis::feed(const SampleVector::const_iterator& cbegin, const SampleV
for (std::size_t i = 0; i < samplesNeeded; ++i, ++begin)
{
*it++ = Complex(begin->real() / 32768.0, begin->imag() / 32768.0);
*it++ = Complex(begin->real() / 32768.0f, begin->imag() / 32768.0f);
}
// apply fft window (and copy from m_fftBuffer to m_fftIn)
@@ -141,7 +141,7 @@ void SpectrumVis::feed(const SampleVector::const_iterator& cbegin, const SampleV
// not enough samples for FFT - just fill in new data and return
for(std::vector<Complex>::iterator it = m_fftBuffer.begin() + m_fftBufferFill; begin < end; ++begin)
{
*it++ = Complex(begin->real() / 32768.0, begin->imag() / 32768.0);
*it++ = Complex(begin->real() / 32768.0f, begin->imag() / 32768.0f);
}
m_fftBufferFill += todo;