From: Josh Simmons <josh@nega.tv>
Date: Sun, 6 Apr 2025 05:11:56 +0000 (+0200)
Subject: narcissus-math: Update sin-pi error bounds
X-Git-Url: https://git.nega.tv//gitweb.cgi?a=commitdiff_plain;h=5f58e1013b42ee000b09e8119fe84491a1f1441e;p=josh%2Fnarcissus

narcissus-math: Update sin-pi error bounds
---

diff --git a/engine/narcissus-maths/src/sin_cos_pi.rs b/engine/narcissus-maths/src/sin_cos_pi.rs
index b3cc416..e28e9f8 100644
--- a/engine/narcissus-maths/src/sin_cos_pi.rs
+++ b/engine/narcissus-maths/src/sin_cos_pi.rs
@@ -25,7 +25,7 @@ const F32_COS_PI_8_K: [f32; 4] = unsafe {
 /// Simultaneously computes the sine and cosine of `a` expressed in multiples of
 /// *pi* radians, or half-turns.
 ///
-/// Sin error <= 0.96563 ulp.
+/// Sin error <= 0.96441 ulp.
 /// Cos error <= 0.96677 ulp.
 ///
 /// Returns `(sin(a * pi), cos(a * pi))`
diff --git a/engine/narcissus-maths/tests/exhaustive_f32.rs b/engine/narcissus-maths/tests/exhaustive_f32.rs
index 46e96e8..b0e3d73 100644
--- a/engine/narcissus-maths/tests/exhaustive_f32.rs
+++ b/engine/narcissus-maths/tests/exhaustive_f32.rs
@@ -438,7 +438,7 @@ pub fn exhaustive_sin_pi() {
     let errors = check_exhaustive_f32(ref_sin_pi_f32, |a| sin_cos_pi_f32(a).0, false);
     println!("SIN: {errors:?}");
     assert_eq!(errors.max_error_ulp, 1);
-    assert_eq!(errors.num_errors, 55_943_962);
+    assert_eq!(errors.num_errors, 55_931_154);
 }
 
 #[test]