From 248b67076fd1d9814aa2f568dfc048456ebdcd10 Mon Sep 17 00:00:00 2001
From: Nicholas Thompson <NCGThompson@gmail.com>
Date: Mon, 20 Nov 2023 22:41:59 -0500
Subject: [PATCH] made equality tests smarter

---
 src/int.rs        |  2 +-
 src/macros/cmp.rs | 11 +++++++++++
 src/uint.rs       |  2 +-
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/int.rs b/src/int.rs
index 316e1e5..aeab02a 100644
--- a/src/int.rs
+++ b/src/int.rs
@@ -13,7 +13,7 @@ use crate::uint::U256;
 use core::num::ParseIntError;
 
 /// A 256-bit signed integer type.
-#[derive(Clone, Copy, Default, Eq, Hash, PartialEq)]
+#[derive(Clone, Copy, Default, Eq, Hash)]
 #[repr(transparent)]
 pub struct I256(pub [i128; 2]);
 
diff --git a/src/macros/cmp.rs b/src/macros/cmp.rs
index 21e2183..f9a9c0c 100644
--- a/src/macros/cmp.rs
+++ b/src/macros/cmp.rs
@@ -11,6 +11,17 @@ macro_rules! impl_cmp {
             }
         }
 
+        impl PartialEq for $int {
+            #[inline]
+            fn eq(&self, other: &Self) -> bool {
+                let (ahi, alo) = self.into_words();
+                let (bhi, blo) = other.into_words();
+                (ahi == bhi) & (alo == blo)
+                // bitwise and rather than logical and
+                // to make O0 code more effecient.
+            }
+        }
+
         impl PartialEq<$prim> for $int {
             #[inline]
             fn eq(&self, other: &$prim) -> bool {
diff --git a/src/uint.rs b/src/uint.rs
index d446b67..8b28e5b 100644
--- a/src/uint.rs
+++ b/src/uint.rs
@@ -13,7 +13,7 @@ use crate::I256;
 use core::num::ParseIntError;
 
 /// A 256-bit unsigned integer type.
-#[derive(Clone, Copy, Default, Eq, Hash, PartialEq)]
+#[derive(Clone, Copy, Default, Eq, Hash)]
 #[repr(transparent)]
 pub struct U256(pub [u128; 2]);