fix(fft): restore previous PI approximation

2026-01-12 08:08:31 -05:00 · 2025-09-01 15:23:02 +02:00
1 changed files with 3 additions and 1 deletions
--- a/tfhe-fft/src/fft_simd.rs
+++ b/tfhe-fft/src/fft_simd.rs
@@ -276,7 +276,9 @@ pub fn sincospi64(mut a: f64) -> (f64, f64) {
    let s = s * t;
    r *= s;

-    let mut s = fma(t, f64::consts::PI, r);
+    // Noise analysis has been done based on this precise value
+    #[allow(clippy::approx_constant)]
+    let mut s = fma(t, 3.1415926535897931e+0, r);
    // map results according to quadrant

    if (i & 2) != 0 {