From 539451be154117ebc3850747b710ead3b5588673 Mon Sep 17 00:00:00 2001
From: xtqqczze <45661989+xtqqczze@users.noreply.github.com>
Date: Sat, 21 Feb 2026 09:56:38 +0000
Subject: [PATCH] Help JIT elide redundant CharToHexLookup range check

---
 src/libraries/Common/src/System/HexConverter.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libraries/Common/src/System/HexConverter.cs b/src/libraries/Common/src/System/HexConverter.cs
index 0ff09f1bc94fe0..362fb2d96239f8 100644
--- a/src/libraries/Common/src/System/HexConverter.cs
+++ b/src/libraries/Common/src/System/HexConverter.cs
@@ -524,13 +524,13 @@ private static bool TryDecodeFromUtf16_Scalar(ReadOnlySpan<char> source, Span<by
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static int FromChar(int c)
         {
-            return (c >= CharToHexLookup.Length) ? 0xFF : CharToHexLookup[c];
+            return (uint)c >= (uint)CharToHexLookup.Length ? 0xFF : CharToHexLookup[c];
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static int FromUpperChar(int c)
         {
-            return (c > 71) ? 0xFF : CharToHexLookup[c];
+            return (uint)c > 71 ? 0xFF : CharToHexLookup[c];
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]