From a02481a5d941b22041796e6ebdf2565319c48508 Mon Sep 17 00:00:00 2001
From: Beinsezii <beinsezii@gmail.com>
Date: Wed, 26 Jun 2024 15:29:59 -0700
Subject: [PATCH] cielab_to_xyz 70% perf improvement

yay fma
---
 src/lib.rs | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 02c629b..f9eb28f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1329,10 +1329,11 @@ pub fn cielab_to_xyz<T: DType, const N: usize>(pixel: &mut [T; N])
 where
     Channels<N>: ValidChannels,
 {
+    pixel[0] = pixel[0].fma((1.0 / 116.0).to_dt(), (16.0 / 116.0).to_dt());
     [pixel[0], pixel[1], pixel[2]] = [
-        (pixel[0] + 16.0.to_dt()) / 116.0.to_dt() + pixel[1] / 500.0.to_dt(),
-        (pixel[0] + 16.0.to_dt()) / 116.0.to_dt(),
-        (pixel[0] + 16.0.to_dt()) / 116.0.to_dt() - pixel[2] / 200.0.to_dt(),
+        pixel[0] + pixel[1] / 500.0.to_dt(),
+        pixel[0],
+        pixel[0] - pixel[2] / 200.0.to_dt(),
     ];
 
     pixel.iter_mut().take(3).for_each(|c| {