diff --git a/src/corelib/text/qlatin1stringmatcher.h b/src/corelib/text/qlatin1stringmatcher.h
index a256250e9c6..3b8c24fc924 100644
--- a/src/corelib/text/qlatin1stringmatcher.h
+++ b/src/corelib/text/qlatin1stringmatcher.h
@@ -98,6 +98,18 @@ struct QCaseInsensitiveLatin1Hash
         return std::size_t(latin1Lower[uchar(c)]);
     }
 
+    static int difference(char lhs, char rhs)
+    {
+        return int(latin1Lower[uchar(lhs)]) - int(latin1Lower[uchar(rhs)]);
+    }
+
+    static auto matcher(char ch)
+    {
+        return [sought = latin1Lower[uchar(ch)]](char other) {
+            return latin1Lower[uchar(other)] == sought;
+        };
+    }
+
 private:
     static constexpr uchar latin1Lower[256] = {
         0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,
diff --git a/src/corelib/text/qstring.cpp b/src/corelib/text/qstring.cpp
index c8c7ce395a3..33a54ab2e16 100644
--- a/src/corelib/text/qstring.cpp
+++ b/src/corelib/text/qstring.cpp
@@ -1383,25 +1383,8 @@ static int ucstrcmp(const char16_t *a, size_t alen, const Char2 *b, size_t blen)
     return cmp ? cmp : lencmp(alen, blen);
 }
 
-static constexpr uchar latin1Lower[256] = {
-    0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,
-    0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,
-    0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
-    0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
-    0x40,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,
-    0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x5b,0x5c,0x5d,0x5e,0x5f,
-    0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,
-    0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f,
-    0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f,
-    0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f,
-    0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf,
-    0xb0,0xb1,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7,0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0xbe,0xbf,
-    // 0xd7 (multiplication sign) and 0xdf (sz ligature) complicate life
-    0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xeb,0xec,0xed,0xee,0xef,
-    0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xd7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xdf,
-    0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xeb,0xec,0xed,0xee,0xef,
-    0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff
-};
+using CaseInsensitiveL1 = QtPrivate::QCaseInsensitiveLatin1Hash;
+
 static int latin1nicmp(const char *lhsChar, qsizetype lSize, const char *rhsChar, qsizetype rSize)
 {
     // We're called with QLatin1StringView's .data() and .size():
@@ -1412,11 +1395,9 @@ static int latin1nicmp(const char *lhsChar, qsizetype lSize, const char *rhsChar
         return 1;
     const qsizetype size = std::min(lSize, rSize);
 
-    const uchar *lhs = reinterpret_cast<const uchar *>(lhsChar);
-    const uchar *rhs = reinterpret_cast<const uchar *>(rhsChar);
-    Q_ASSERT(lhs && rhs); // since both lSize and rSize are positive
+    Q_ASSERT(lhsChar && rhsChar); // since both lSize and rSize are positive
     for (qsizetype i = 0; i < size; i++) {
-        if (int res = latin1Lower[lhs[i]] - latin1Lower[rhs[i]])
+        if (int res = CaseInsensitiveL1::difference(lhsChar[i], rhsChar[i]))
             return res;
     }
     return lencmp(lSize, rSize);
@@ -10674,11 +10655,8 @@ qsizetype QtPrivate::count(QLatin1StringView haystack, QChar needle, Qt::CaseSen
     if (cs == Qt::CaseSensitive) {
         return std::count(haystack.cbegin(), haystack.cend(), needle.toLatin1());
     } else {
-        auto toLower = [](char ch) { return latin1Lower[uchar(ch)]; };
-        const uchar ch = toLower(needle.toLatin1());
-        return std::count_if(haystack.cbegin(), haystack.cend(), [&toLower, ch](const char c) {
-            return toLower(c) == ch;
-        });
+        return std::count_if(haystack.cbegin(), haystack.cend(),
+                             CaseInsensitiveL1::matcher(needle.toLatin1()));
     }
 }
 
@@ -10908,10 +10886,7 @@ qsizetype QtPrivate::findString(QLatin1StringView haystack, qsizetype from, QLat
     if (needle.size() <= threshold) {
         const auto begin = haystack.begin();
         const auto end = haystack.end() - needle.size() + 1;
-        const uchar needle1 = latin1Lower[uchar(needle[0].toLatin1())];
-        auto ciMatch = [needle1](const char ch) {
-            return latin1Lower[uchar(ch)] == needle1;
-        };
+        auto ciMatch = CaseInsensitiveL1::matcher(needle[0].toLatin1());
         const qsizetype nlen1 = needle.size() - 1;
         for (auto it = std::find_if(begin + from, end, ciMatch); it < end;
              it = std::find_if(it + 1, end, ciMatch)) {