From: Joshua Simmons <josh@nega.tv>
Date: Fri, 11 Nov 2022 21:53:38 +0000 (+0100)
Subject: Add fallback for `round_ties_to_even` SSE4.1 path
X-Git-Url: https://git.nega.tv//gitweb.cgi?a=commitdiff_plain;h=d35281efe6664fa06132fc68ba44d938a76cfac7;p=josh%2Fnarcissus

Add fallback for `round_ties_to_even` SSE4.1 path
---

diff --git a/narcissus-maths/src/lib.rs b/narcissus-maths/src/lib.rs
index 2e71ed0..e653a05 100644
--- a/narcissus-maths/src/lib.rs
+++ b/narcissus-maths/src/lib.rs
@@ -187,6 +187,10 @@ fn round_ties_to_even(x: f32) -> f32 {
         let x = _mm_round_ss::<ROUNDING>(x, x);
         std::arch::x86_64::_mm_cvtss_f32(x)
     }
+
+    // Incorrect if the rounding mode is changed.
+    #[cfg(not(target_feature = "sse4.1"))]
+    x.round()
 }
 
 #[macro_export]