From 4981b3c6710eaac7cb4fc2eb92821b47db74f2ff Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Thu, 2 Apr 2026 13:36:48 -1000
Subject: [PATCH] [light] Use reciprocal multiply in normalize_color

Replace 3 software float divides (__divsf3) with 1 divide + 3 native
mul.s instructions. Xtensa has no FPU divide, so __divsf3 is a ~20-30
cycle software routine. This saves ~40-60 cycles per normalize_color
call for +8 bytes of flash.
---
 esphome/components/light/light_color_values.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/esphome/components/light/light_color_values.h b/esphome/components/light/light_color_values.h
index a2c2dbca46..fa286a3941 100644
--- a/esphome/components/light/light_color_values.h
+++ b/esphome/components/light/light_color_values.h
@@ -104,9 +104,10 @@ class LightColorValues {
         this->green_ = 1.0f;
         this->blue_ = 1.0f;
       } else {
-        this->red_ /= max_value;
-        this->green_ /= max_value;
-        this->blue_ /= max_value;
+        float inv = 1.0f / max_value;
+        this->red_ *= inv;
+        this->green_ *= inv;
+        this->blue_ *= inv;
       }
     }
   }