From 47edde1086412b36e9efd6098b191ec15a2a760a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Beno=C3=AEt=20du=20Garreau?= <bdgdlm@outlook.com>
Date: Mon, 4 Oct 2021 18:52:17 +0200
Subject: [PATCH] Optimize `saturating_add_signed`

---
 library/core/src/num/uint_macros.rs | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/library/core/src/num/uint_macros.rs b/library/core/src/num/uint_macros.rs
index 5a65f77a87993..96375b82582ed 100644
--- a/library/core/src/num/uint_macros.rs
+++ b/library/core/src/num/uint_macros.rs
@@ -1037,10 +1037,13 @@ macro_rules! uint_impl {
                       without modifying the original"]
         #[inline]
         pub const fn saturating_add_signed(self, rhs: $SignedT) -> Self {
-            if rhs >= 0 {
-                self.saturating_add(rhs as Self)
+            let (res, overflow) = self.overflowing_add(rhs as Self);
+            if overflow == (rhs < 0) {
+                res
+            } else if overflow {
+                Self::MAX
             } else {
-                self.saturating_sub(rhs.unsigned_abs())
+                0
             }
         }