diff --git a/src/libraries/System.Private.CoreLib/src/System/Text/Ascii.Utility.cs b/src/libraries/System.Private.CoreLib/src/System/Text/Ascii.Utility.cs
index 44031cc49d5874..3cfcfef7271cbf 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Text/Ascii.Utility.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Text/Ascii.Utility.cs
@@ -2228,6 +2228,7 @@ internal static unsafe nuint WidenAsciiToUtf16(byte* pAsciiBuffer, char* pUtf16B
             goto Finish;
         }
 
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         private static unsafe void WidenAsciiToUtf1_Vector<TVectorByte, TVectorUShort>(byte* pAsciiBuffer, char* pUtf16Buffer, ref nuint currentOffset, nuint elementCount)
             where TVectorByte : unmanaged, ISimdVector<TVectorByte, byte>
             where TVectorUShort : unmanaged, ISimdVector<TVectorUShort, ushort>
@@ -2238,7 +2239,7 @@ private static unsafe void WidenAsciiToUtf1_Vector<TVectorByte, TVectorUShort>(b
             // write instructions. See: https://github.com/dotnet/runtime/issues/33002
             nuint finalOffsetWhereCanRunLoop = elementCount - (nuint)TVectorByte.Count;
             TVectorByte asciiVector = TVectorByte.Load(pAsciiBuffer + currentOffset);
-            if (HasNoMatch<TVectorByte>(asciiVector))
+            if (!HasMatch<TVectorByte>(asciiVector))
             {
                 (TVectorUShort utf16LowVector, TVectorUShort utf16HighVector) = Widen<TVectorByte, TVectorUShort>(asciiVector);
                 utf16LowVector.Store(pCurrentWriteAddress);
@@ -2261,7 +2262,7 @@ private static unsafe void WidenAsciiToUtf1_Vector<TVectorByte, TVectorUShort>(b
                 while (currentOffset <= finalOffsetWhereCanRunLoop)
                 {
                     asciiVector = TVectorByte.Load(pAsciiBuffer + currentOffset);
-                    if (HasNoMatch<TVectorByte>(asciiVector))
+                    if (HasMatch<TVectorByte>(asciiVector))
                     {
                         break;
                     }
@@ -2278,14 +2279,14 @@ private static unsafe void WidenAsciiToUtf1_Vector<TVectorByte, TVectorUShort>(b
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private static unsafe bool HasNoMatch<TVectorByte>(TVectorByte vector)
+        private static unsafe bool HasMatch<TVectorByte>(TVectorByte vector)
             where TVectorByte : unmanaged, ISimdVector<TVectorByte, byte>
         {
             if (AdvSimd.IsSupported && typeof(TVectorByte) == typeof(Vector128<byte>))
             {
-                return !VectorContainsNonAsciiChar((Vector128<byte>)(object)vector);
+                return VectorContainsNonAsciiChar((Vector128<byte>)(object)vector);
             }
-            return !TVectorByte.AnyMatches(vector);
+            return TVectorByte.AnyMatches(vector);
         }