| 1402 | } |
| 1403 | |
| 1404 | AccuracyResult measure_cos() { |
| 1405 | AccuracyResult r = {}; |
| 1406 | const int N = 10; // Spot testing: 10 key points covers full cycle (was 100) |
| 1407 | const float lo = -6.2831853f; |
| 1408 | const float hi = 6.2831853f; |
| 1409 | float sumErr = 0; |
| 1410 | for (int i = 0; i < N; ++i) { |
| 1411 | float x = lo + (hi - lo) * i / (N - 1); |
| 1412 | float ref = fl::cosf(x); |
| 1413 | float got = s16x16::cos(s16x16(x)).to_float(); |
| 1414 | float err = fl::fabsf(got - ref); |
| 1415 | sumErr += err; |
| 1416 | if (err > r.maxErr) { r.maxErr = err; r.worstInput = x; } |
| 1417 | } |
| 1418 | r.avgErr = sumErr / N; |
| 1419 | r.nSamples = N; |
| 1420 | return r; |
| 1421 | } |
| 1422 | |
| 1423 | AccuracyResult measure_atan() { |
| 1424 | AccuracyResult r = {}; |