Matiq
d802ee7aed
Extracted the 8x16 irrational tables + lead-in -708.4xx series from soothe_mem.bin
into exp2_tables.{hpp,cpp} (P3 bit-exact inputs). exp2_dsp = numerically-correct
double exp2 matching std::exp2 (wiring fallback; NOT bit-exact yet — the plugin
body has special subnormal/overflow branches and a vfmadd213sd poly not yet 1:1).
exp2_check: 2e6-grid PASS (0 cells >1e-13).
21 lines
694 B
C++
21 lines
694 B
C++
// exp2.cpp — numerical double exp2 (wiring fallback) + P3 asset note.
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// The plugin's table-driven path (0x18026b820: kExp2_* irr tables + vfmadd213sd +
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// Cody-Waite hi/lo) is bit-exact-remaining; this module provides the correct
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// function value for structural wiring until the 1:1 transcription lands.
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#include "exp2.hpp"
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#include <cmath>
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#include <cstdint>
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#include <cstring>
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#include <limits>
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namespace exp2d {
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double exp2_dsp(double x) {
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if (std::isnan(x)) return x;
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if (x == 0.0) return 1.0;
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if (x == -std::numeric_limits<double>::infinity()) return 0.0;
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if (x == std::numeric_limits<double>::infinity()) return x;
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return std::exp2(x);
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}
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} // namespace exp2d
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