From 267796532f8d0fa60207dbc3d4aabeebd3b58d0c Mon Sep 17 00:00:00 2001
From: Oscar Gustafsson <oscar.gustafsson@gmail.com>
Date: Sat, 16 May 2026 19:45:23 +0200
Subject: [PATCH] Change division to multiplication in floating-point midpoint

---
 library/core/src/num/f128.rs | 6 +++---
 library/core/src/num/f16.rs  | 6 +++---
 library/core/src/num/f32.rs  | 8 ++++----
 library/core/src/num/f64.rs  | 6 +++---
 4 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/library/core/src/num/f128.rs b/library/core/src/num/f128.rs
index c17f55a25896a..d381402b469f4 100644
--- a/library/core/src/num/f128.rs
+++ b/library/core/src/num/f128.rs
@@ -977,7 +977,7 @@ impl f128 {
     #[must_use = "this returns the result of the operation, \
                   without modifying the original"]
     pub const fn midpoint(self, other: f128) -> f128 {
-        const HI: f128 = f128::MAX / 2.;
+        const HI: f128 = f128::MAX * 0.5;
 
         let (a, b) = (self, other);
         let abs_a = a.abs();
@@ -985,9 +985,9 @@ impl f128 {
 
         if abs_a <= HI && abs_b <= HI {
             // Overflow is impossible
-            (a + b) / 2.
+            (a + b) * 0.5
         } else {
-            (a / 2.) + (b / 2.)
+            (a * 0.5) + (b * 0.5)
         }
     }
 
diff --git a/library/core/src/num/f16.rs b/library/core/src/num/f16.rs
index 110465068b8f6..c26ae17d870cc 100644
--- a/library/core/src/num/f16.rs
+++ b/library/core/src/num/f16.rs
@@ -973,7 +973,7 @@ impl f16 {
     #[must_use = "this returns the result of the operation, \
                   without modifying the original"]
     pub const fn midpoint(self, other: f16) -> f16 {
-        const HI: f16 = f16::MAX / 2.;
+        const HI: f16 = f16::MAX * 0.5;
 
         let (a, b) = (self, other);
         let abs_a = a.abs();
@@ -981,9 +981,9 @@ impl f16 {
 
         if abs_a <= HI && abs_b <= HI {
             // Overflow is impossible
-            (a + b) / 2.
+            (a + b) * 0.5
         } else {
-            (a / 2.) + (b / 2.)
+            (a * 0.5) + (b * 0.5)
         }
     }
 
diff --git a/library/core/src/num/f32.rs b/library/core/src/num/f32.rs
index f9cb7cc650f4f..24c97a6491c11 100644
--- a/library/core/src/num/f32.rs
+++ b/library/core/src/num/f32.rs
@@ -1164,10 +1164,10 @@ impl f32 {
                 target_arch = "wasm32",
                 target_arch = "wasm64",
             ) => {
-                ((self as f64 + other as f64) / 2.0) as f32
+                ((self as f64 + other as f64) * 0.5) as f32
             }
             _ => {
-                const HI: f32 = f32::MAX / 2.;
+                const HI: f32 = f32::MAX * 0.5;
 
                 let (a, b) = (self, other);
                 let abs_a = a.abs();
@@ -1175,9 +1175,9 @@ impl f32 {
 
                 if abs_a <= HI && abs_b <= HI {
                     // Overflow is impossible
-                    (a + b) / 2.
+                    (a + b) * 0.5
                 } else {
-                    (a / 2.) + (b / 2.)
+                    (a * 0.5) + (b * 0.5)
                 }
             }
         }
diff --git a/library/core/src/num/f64.rs b/library/core/src/num/f64.rs
index 87f5505ce2b33..be045033a3553 100644
--- a/library/core/src/num/f64.rs
+++ b/library/core/src/num/f64.rs
@@ -1150,7 +1150,7 @@ impl f64 {
     #[must_use = "this returns the result of the operation, \
                   without modifying the original"]
     pub const fn midpoint(self, other: f64) -> f64 {
-        const HI: f64 = f64::MAX / 2.;
+        const HI: f64 = f64::MAX * 0.5;
 
         let (a, b) = (self, other);
         let abs_a = a.abs();
@@ -1158,9 +1158,9 @@ impl f64 {
 
         if abs_a <= HI && abs_b <= HI {
             // Overflow is impossible
-            (a + b) / 2.
+            (a + b) * 0.5
         } else {
-            (a / 2.) + (b / 2.)
+            (a * 0.5) + (b * 0.5)
         }
     }