diff --git a/ext/ldap/JitLdapResult.php b/ext/ldap/JitLdapResult.php
new file mode 100644
index 00000000000..55d9ebead37
--- /dev/null
+++ b/ext/ldap/JitLdapResult.php
@@ -0,0 +1,110 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PHPCompiler\ext\ldap;
+
+use PHPCompiler\ext\standard\JitGetObjectId;
+use PHPCompiler\JIT\BasicBlockHelper;
+use PHPCompiler\JIT\Builtin\LdapRuntime;
+use PHPCompiler\JIT\Builtin\TypeErrorRaise;
+use PHPCompiler\JIT\Context;
+use PHPCompiler\JIT\JitStringBuiltinArg;
+use PHPCompiler\JIT\JitValueBox;
+use PHPCompiler\JIT\Variable as JITVariable;
+use PHPLLVM\Value;
+
+/** LLVM lowering for ldap_compare() (#32121). */
+final class JitLdapResult
+{
+    /** @param list<JITVariable> $args */
+    public static function invokeCompare(Context $context, array $args): Value
+    {
+        $argc = \count($args);
+        if ($argc < 4 || $argc > 5) {
+            throw new \ArgumentCountError(\sprintf(
+                'ldap_compare() expects between 4 and 5 arguments, %d given',
+                $argc
+            ));
+        }
+
+        $handle = self::lowerConnectionHandle($context, $args[0], 'ldap_compare');
+        $dn = JitStringBuiltinArg::lower($context, $args[1], 'ldap_compare', 1, 'dn');
+        $attribute = JitStringBuiltinArg::lower($context, $args[2], 'ldap_compare', 2, 'attribute');
+        $value = JitStringBuiltinArg::lower($context, $args[3], 'ldap_compare', 3, 'value');
+
+        $savedInsert = BasicBlockHelper::tryGetInsertBlock($context);
+        LdapRuntime::ensureLinked($context);
+        if (null !== $savedInsert) {
+            BasicBlockHelper::restoreInsertBlock($context, $savedInsert);
+        }
+
+        return $context->builder->call(
+            $context->lookupFunction('__compiler_ldap_compare'),
+            $handle,
+            $dn,
+            $attribute,
+            $value
+        );
+    }
+
+    private static function lowerConnectionHandle(Context $context, JITVariable $arg, string $function): Value
+    {
+        if (JITVariable::TYPE_OBJECT === $arg->type) {
+            return JitGetObjectId::invoke($context, $arg, $function);
+        }
+        if (JITVariable::TYPE_VALUE === $arg->type) {
+            $loaded = JitValueBox::valuePtrFromVariable($context, $arg);
+            $obj = $context->builder->call(
+                $context->lookupFunction('__value__readObject'),
+                $loaded
+            );
+            $voidp = $context->getTypeFromString('void')->pointerType(0);
+            $i64 = $context->getTypeFromString('int64');
+
+            return $context->builder->ptrToInt(
+                $context->builder->pointerCast($obj, $voidp),
+                $i64
+            );
+        }
+
+        self::emitTypeErrorAndAbort($context, self::scalarTypeError($function, $arg->type));
+
+        return $context->getTypeFromString('int64')->constInt(0, false);
+    }
+
+    private static function emitTypeErrorAndAbort(Context $context, string $message): void
+    {
+        TypeErrorRaise::registerDeclarations($context);
+        TypeErrorRaise::ensureLinked($context);
+        TypeErrorRaise::emitRaise($context, $message);
+        $context->builder->call($context->lookupFunction('abort'));
+    }
+
+    private static function scalarTypeError(string $function, int $type): string
+    {
+        switch ($type) {
+            case JITVariable::TYPE_NATIVE_LONG:
+                return self::typeErrorMessage($function, 'int');
+            case JITVariable::TYPE_NATIVE_DOUBLE:
+                return self::typeErrorMessage($function, 'float');
+            case JITVariable::TYPE_NATIVE_BOOL:
+                return self::typeErrorMessage($function, 'bool');
+            case JITVariable::TYPE_STRING:
+                return self::typeErrorMessage($function, 'string');
+            case JITVariable::TYPE_NULL:
+                return self::typeErrorMessage($function, 'null');
+            default:
+                return self::typeErrorMessage($function, 'mixed');
+        }
+    }
+
+    private static function typeErrorMessage(string $function, string $given): string
+    {
+        return \sprintf(
+            '%s(): Argument #1 ($ldap) must be of type LDAP\\Connection, %s given',
+            $function,
+            $given
+        );
+    }
+}
diff --git a/ext/ldap/LdapResultJitHelper.php b/ext/ldap/LdapResultJitHelper.php
new file mode 100644
index 00000000000..a53cb23f32c
--- /dev/null
+++ b/ext/ldap/LdapResultJitHelper.php
@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PHPCompiler\ext\ldap;
+
+use PHPCompiler\VM\ObjectEntry;
+use PHPCompiler\VM\Variable;
+
+/**
+ * ldap_compare() for compiled JIT/AOT modules (#32121).
+ *
+ * SSOT: {@see VmLdapCore::compare}
+ * php-src: ext/ldap/ldap.c — PHP_FUNCTION(ldap_compare)
+ */
+final class LdapResultJitHelper
+{
+    public static function compareArgv(int $handle, string $dn, string $attribute, string $value): Variable
+    {
+        $conn = self::requireConnection($handle, 'ldap_compare');
+        $result = VmLdapCore::compare($conn, $dn, $attribute, $value);
+        $out = new Variable();
+        if (\is_bool($result)) {
+            $out->bool($result);
+        } else {
+            $out->int($result);
+        }
+
+        return $out;
+    }
+
+    private static function requireConnection(int $handle, string $function): ObjectEntry
+    {
+        if (VmLdapConnection::isClosedLookupKey($handle)) {
+            throw new \TypeError(\sprintf(
+                '%s(): supplied LDAP\\Connection is not a valid ldap link resource',
+                $function
+            ));
+        }
+        $conn = VmLdapConnection::connectionForLookupKey($handle);
+        if (null === $conn) {
+            throw new \TypeError(\sprintf(
+                '%s(): Argument #1 ($ldap) must be of type LDAP\\Connection, mixed given',
+                $function
+            ));
+        }
+
+        return $conn;
+    }
+}
diff --git a/ext/ldap/ldap_result_builtins.php b/ext/ldap/ldap_result_builtins.php
index 512dfb4e2f8..0a8ea5ce245 100644
--- a/ext/ldap/ldap_result_builtins.php
+++ b/ext/ldap/ldap_result_builtins.php
@@ -51,7 +51,7 @@ public function execute(Frame $frame): void
 
     public function call(Context $context, JITVariable ...$args): Value
     {
-        throw new \LogicException('ldap_compare() is not implemented for JIT in this compiler build (issue #22177)');
+        return JitLdapResult::invokeCompare($context, $args);
     }
 }
 
diff --git a/lib/JIT/Builtin/LdapRuntime.php b/lib/JIT/Builtin/LdapRuntime.php
index 01a8dd96349..39140ee0798 100644
--- a/lib/JIT/Builtin/LdapRuntime.php
+++ b/lib/JIT/Builtin/LdapRuntime.php
@@ -9,8 +9,8 @@
 
 /**
  * JIT/AOT link for ldap_escape / ldap_dn2ufn / ldap_explode_dn / ldap_connect /
- * ldap_connect_wallet / ldap_bind / ldap_unbind / ldap_errno / ldap_error / ldap_err2str
- * (#6352, #18173, #22212, #22276, #31984, #32000, #32001, #32002, #32106).
+ * ldap_connect_wallet / ldap_bind / ldap_unbind / ldap_errno / ldap_error / ldap_err2str /
+ * ldap_compare (#6352, #18173, #22212, #22276, #31984, #32000, #32001, #32002, #32106, #32121).
  *
  * Helper compile: {@see JitVmHelperLink::ensureBridge} (peer StringStrcoll #22256).
  * php-src: ext/ldap/ldap.c
@@ -23,6 +23,8 @@ final class LdapRuntime
 
     private const LINK_HELPER_PATH = '/ext/ldap/LdapLinkJitHelper.php';
 
+    private const RESULT_HELPER_PATH = '/ext/ldap/LdapResultJitHelper.php';
+
     private const LDAP_ESCAPE_HELPER = 'PHPCompiler\\ext\\ldap\\LdapEscapeJitHelper::ldapEscape';
 
     private const LDAP_DN2UFN_HELPER = 'PHPCompiler\\ext\\ldap\\LdapDnJitHelper::dn2ufn';
@@ -45,6 +47,8 @@ final class LdapRuntime
 
     private const LDAP_ERR2STR_HELPER = 'PHPCompiler\\ext\\ldap\\LdapLinkJitHelper::err2strArgv';
 
+    private const LDAP_COMPARE_HELPER = 'PHPCompiler\\ext\\ldap\\LdapResultJitHelper::compareArgv';
+
     /** @var list<string> */
     private const ESCAPE_HELPERS = [
         self::LDAP_ESCAPE_HELPER,
@@ -68,6 +72,11 @@ final class LdapRuntime
         self::LDAP_ERR2STR_HELPER,
     ];
 
+    /** @var list<string> */
+    private const RESULT_HELPERS = [
+        self::LDAP_COMPARE_HELPER,
+    ];
+
     public static function ensureLinked(Context $context): void
     {
         self::implement($context);
@@ -211,6 +220,17 @@ private static function implement(Context $context): void
             self::LINK_HELPERS,
             '#32106'
         );
+        JitVmHelperLink::ensureBridge(
+            $context,
+            '__compiler_ldap_compare',
+            'ldap_compare_bridge_entry',
+            [$i64, $strPtr, $strPtr, $strPtr],
+            $valuePtr,
+            self::LDAP_COMPARE_HELPER,
+            self::RESULT_HELPER_PATH,
+            self::RESULT_HELPERS,
+            '#32121'
+        );
 
         if (null !== $savedBlock) {
             $context->builder->positionAtEnd($savedBlock);
diff --git a/test/repro/issue_ldap_compare_jit.php b/test/repro/issue_ldap_compare_jit.php
new file mode 100644
index 00000000000..b849c4348ef
--- /dev/null
+++ b/test/repro/issue_ldap_compare_jit.php
@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+// Requires ext/ldap in the compile unit (peer ext/ldap_compare_parse.phpt).
+putenv('PHP_COMPILER_ENABLE_LDAP=1');
+$_ENV['PHP_COMPILER_ENABLE_LDAP'] = '1';
+$_SERVER['PHP_COMPILER_ENABLE_LDAP'] = '1';
+
+error_reporting(E_ALL);
+
+echo 'fn=', function_exists('ldap_compare') ? '1' : '0', PHP_EOL;
+
+if (!function_exists('ldap_compare')) {
+    echo "skip\n";
+    exit(0);
+}
+
+$link = @ldap_connect('ldap://127.0.0.1');
+if (!($link instanceof LDAP\Connection)) {
+    echo "connect=0\n";
+    exit(0);
+}
+
+@ldap_bind($link);
+set_error_handler(static fn (): bool => true);
+try {
+    $result = ldap_compare($link, 'cn=x', 'cn', 'x');
+} finally {
+    restore_error_handler();
+}
+
+if (\is_bool($result)) {
+    echo 'result=', $result ? 'true' : 'false', PHP_EOL;
+} else {
+    echo 'result=', $result, PHP_EOL;
+}
+echo "ok\n";
diff --git a/test/unit/LdapCompareJitHelperTest.php b/test/unit/LdapCompareJitHelperTest.php
new file mode 100644
index 00000000000..8c10dcb49b1
--- /dev/null
+++ b/test/unit/LdapCompareJitHelperTest.php
@@ -0,0 +1,76 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PHPCompiler\Test\Unit;
+
+use PHPCompiler\ext\ldap\LdapResultJitHelper;
+use PHPCompiler\ext\ldap\VmLdapCore;
+use PHPCompiler\ext\ldap\VmLdapConnection;
+use PHPCompiler\ext\ldap\VmLdapNative;
+use PHPCompiler\Runtime;
+use PHPCompiler\VM\Context;
+use PHPCompiler\VM\Variable;
+use PHPUnit\Framework\TestCase;
+
+/** ldap_compare() JIT helper SSOT (#32121). */
+final class LdapCompareJitHelperTest extends TestCase
+{
+    public function testCallDelegatesToJitLowering(): void
+    {
+        $source = (string) file_get_contents(__DIR__.'/../../ext/ldap/ldap_result_builtins.php');
+        $this->assertStringContainsString('JitLdapResult::invokeCompare', $source);
+        $this->assertStringNotContainsString('ldap_compare() is not implemented for JIT', $source);
+
+        $jit = (string) file_get_contents(__DIR__.'/../../ext/ldap/JitLdapResult.php');
+        $this->assertStringContainsString('__compiler_ldap_compare', $jit);
+
+        $runtime = (string) file_get_contents(__DIR__.'/../../lib/JIT/Builtin/LdapRuntime.php');
+        $this->assertStringContainsString('LdapResultJitHelper::compareArgv', $runtime);
+    }
+
+    public function testTypeErrorOnNonConnectionHandle(): void
+    {
+        $this->expectException(\TypeError::class);
+        $this->expectExceptionMessage('ldap_compare(): Argument #1 ($ldap) must be of type LDAP\\Connection, mixed given');
+        LdapResultJitHelper::compareArgv(888_888, 'cn=x', 'cn', 'x');
+    }
+
+    public function testCompareReturnsBoolOrIntWithoutLiveDirectory(): void
+    {
+        if (!VmLdapNative::available()) {
+            self::markTestSkipped('libldap FFI absent — compare path not exercised');
+        }
+        $ctx = self::ldapContext();
+        $linkVar = VmLdapCore::connect('ldap://127.0.0.1', null, $ctx);
+        if (false === $linkVar) {
+            self::markTestSkipped('ldap_connect failed in container');
+        }
+        $object = $linkVar->toObject();
+        VmLdapConnection::enqueuePendingJitHandle($object->id);
+        VmLdapConnection::claimPendingJitHandle(42_003);
+
+        set_error_handler(static fn (): bool => true);
+        try {
+            @VmLdapCore::bind($object, null, null);
+            $out = LdapResultJitHelper::compareArgv(42_003, 'cn=x', 'cn', 'x');
+        } finally {
+            restore_error_handler();
+            VmLdapConnection::close($object);
+        }
+
+        $this->assertContains(
+            $out->type,
+            [Variable::TYPE_BOOLEAN, Variable::TYPE_INTEGER],
+            'compare must return bool or int (-1)'
+        );
+    }
+
+    private static function ldapContext(): Context
+    {
+        $runtime = new Runtime();
+        $runtime->load(new \PHPCompiler\ext\ldap\Module());
+
+        return $runtime->vmContext;
+    }
+}
diff --git a/test/unit/LdapRuntimeShrinkTest.php b/test/unit/LdapRuntimeShrinkTest.php
index 9706158003b..5257b6db2b4 100644
--- a/test/unit/LdapRuntimeShrinkTest.php
+++ b/test/unit/LdapRuntimeShrinkTest.php
@@ -34,8 +34,9 @@ public function testLdapRuntimeUsesJitVmHelperLinkForAllBridges(): void
         $this->assertStringContainsString('__compiler_ldap_errno', $source);
         $this->assertStringContainsString('__compiler_ldap_error', $source);
         $this->assertStringContainsString('__compiler_ldap_err2str', $source);
+        $this->assertStringContainsString('__compiler_ldap_compare', $source);
         $this->assertStringContainsString('ldap_connect_bridge_entry', $source);
-        $this->assertSame(11, \preg_match_all('/JitVmHelperLink::ensureBridge\(/', $source));
+        $this->assertSame(12, \preg_match_all('/JitVmHelperLink::ensureBridge\(/', $source));
         $this->assertStringNotContainsString('NestedJitCompileScope::run', $source);
         $this->assertStringNotContainsString('parseAndCompile', $source);
         $this->assertStringNotContainsString('new JIT(', $source);
@@ -43,6 +44,6 @@ public function testLdapRuntimeUsesJitVmHelperLinkForAllBridges(): void
         $this->assertStringNotContainsString('use PHPCompiler\\JIT\\NestedJitCompileScope;', $source);
         $this->assertStringNotContainsString('ensureEscapeHelperCompiled', $source);
         $this->assertStringNotContainsString('implementEscapeBridge', $source);
-        $this->assertLessThan(240, \substr_count($source, "\n") + 1);
+        $this->assertLessThan(250, \substr_count($source, "\n") + 1);
     }
 }