diff --git a/src/hotspot/cpu/aarch64/aarch64.ad b/src/hotspot/cpu/aarch64/aarch64.ad
index 690210a8c40..f367362b4d8 100644
--- a/src/hotspot/cpu/aarch64/aarch64.ad
+++ b/src/hotspot/cpu/aarch64/aarch64.ad
@@ -7761,14 +7761,12 @@ instruct popCountI(iRegINoSp dst, iRegIorL2I src, vRegF tmp) %{
   effect(TEMP tmp);
   ins_cost(INSN_COST * 13);
 
-  format %{ "movw   $src, $src\n\t"
-            "mov    $tmp, $src\t# vector (1D)\n\t"
+  format %{ "fmovs  $tmp, $src\t# vector (1S)\n\t"
             "cnt    $tmp, $tmp\t# vector (8B)\n\t"
             "addv   $tmp, $tmp\t# vector (8B)\n\t"
             "mov    $dst, $tmp\t# vector (1D)" %}
   ins_encode %{
-    __ movw($src$$Register, $src$$Register); // ensure top 32 bits 0
-    __ mov($tmp$$FloatRegister, __ D, 0, $src$$Register);
+    __ fmovs($tmp$$FloatRegister, $src$$Register);
     __ cnt($tmp$$FloatRegister, __ T8B, $tmp$$FloatRegister);
     __ addv($tmp$$FloatRegister, __ T8B, $tmp$$FloatRegister);
     __ mov($dst$$Register, $tmp$$FloatRegister, __ D, 0);
diff --git a/test/hotspot/jtreg/compiler/intrinsics/BitCountIAarch64PreservesArgument.java b/test/hotspot/jtreg/compiler/intrinsics/BitCountIAarch64PreservesArgument.java
new file mode 100644
index 00000000000..eb048e0e8ca
--- /dev/null
+++ b/test/hotspot/jtreg/compiler/intrinsics/BitCountIAarch64PreservesArgument.java
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * @test
+ * @bug 8353266
+ * @summary Integer.bitCount modifies input register
+ * @library /test/lib /
+ *
+ * @run main/othervm
+ *      -Xbatch
+ *      -XX:CompileOnly=compiler.intrinsics.BitCountIAarch64PreservesArgument::test
+ *      compiler.intrinsics.BitCountIAarch64PreservesArgument
+ */
+
+/**
+ * @test
+ * @bug 8353266
+ * @library /test/lib /
+ *
+ * @run main compiler.intrinsics.BitCountIAarch64PreservesArgument
+ */
+
+package compiler.intrinsics;
+
+import static compiler.lib.generators.Generators.G;
+
+public class BitCountIAarch64PreservesArgument {
+    static long lFld;
+    static long result;
+
+    public static void main(String[] args) {
+        lFld = 0xfedc_ba98_7654_3210L;
+        for (int i = 0; i < 10_000; i++) {
+            test();
+            if (result != 0xfedc_ba98_7654_3210L) {
+                // Wrongly outputs the cut input 0x7654_3210 == 1985229328
+                throw new RuntimeException("Wrong result. Expected result = " + lFld + "; Actual result = " + result);
+            }
+        }
+
+        lFld = G.longs().next();
+        for (int i = 0; i < 10_000; i++) {
+            test();
+            if (result != lFld) {
+                throw new RuntimeException("Wrong result. Expected result = " + lFld + "; Actual result = " + result);
+            }
+        }
+    }
+
+    static void test() {
+        long x = lFld;
+        try {
+            result = Integer.bitCount((int) x); // Cut input: 0x7654_3210 == 1985229328
+            throw new RuntimeException();
+        } catch (RuntimeException _) {
+        }
+        result = x;
+    }
+}