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https://opencores.org/ocsvn/dblclockfft/dblclockfft/trunk
[/] [dblclockfft/] [trunk/] [sw/] [fftgen.cpp] - Diff between revs 19 and 20
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| Rev 19 |
Rev 20 |
| Line 1042... |
Line 1042... |
double W = ((inv)?1:-1)*2.0*M_PI*k/(double)(2*stage);
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double W = ((inv)?1:-1)*2.0*M_PI*k/(double)(2*stage);
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double c, s;
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double c, s;
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long long ic, is, vl;
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long long ic, is, vl;
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c = cos(W); s = sin(W);
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c = cos(W); s = sin(W);
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ic = (long long)((double)((1ll<<(cbits-2)) * c + 0.5));
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ic = (long long)round((1ll<<(cbits-2)) * c);
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is = (long long)((double)((1ll<<(cbits-2)) * s + 0.5));
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is = (long long)round((1ll<<(cbits-2)) * s);
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vl = (ic & (~(-1ll << (cbits))));
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vl = (ic & (~(-1ll << (cbits))));
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vl <<= (cbits);
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vl <<= (cbits);
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vl |= (is & (~(-1ll << (cbits))));
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vl |= (is & (~(-1ll << (cbits))));
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fprintf(cmem, "%0*llx\n", ((cbits*2+3)/4), vl);
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fprintf(cmem, "%0*llx\n", ((cbits*2+3)/4), vl);
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/*
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/*
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