diff --git a/libs/rs/driver/rsdRuntimeMath.cpp b/libs/rs/driver/rsdRuntimeMath.cpp
index e315539..753ef73 100644
--- a/libs/rs/driver/rsdRuntimeMath.cpp
+++ b/libs/rs/driver/rsdRuntimeMath.cpp
@@ -329,6 +329,16 @@
     return prev;
 }
 
+static uint32_t SC_AtomicUMin(volatile uint32_t *ptr, uint32_t value) {
+    uint32_t prev, status;
+    do {
+        prev = *ptr;
+        uint32_t n = rsMin(value, prev);
+        status = android_atomic_release_cas((int32_t) prev, (int32_t)n, (volatile int32_t*) ptr);
+    } while (CC_UNLIKELY(status != 0));
+    return prev;
+}
+
 static int32_t SC_AtomicMin(volatile int32_t *ptr, int32_t value) {
     int32_t prev, status;
     do {
@@ -339,6 +349,16 @@
     return prev;
 }
 
+static uint32_t SC_AtomicUMax(volatile uint32_t *ptr, uint32_t value) {
+    uint32_t prev, status;
+    do {
+        prev = *ptr;
+        uint32_t n = rsMax(value, prev);
+        status = android_atomic_release_cas((int32_t) prev, (int32_t) n, (volatile int32_t*) ptr);
+    } while (CC_UNLIKELY(status != 0));
+    return prev;
+}
+
 static int32_t SC_AtomicMax(volatile int32_t *ptr, int32_t value) {
     int32_t prev, status;
     do {
@@ -524,9 +544,9 @@
     { "_Z11rsAtomicXorPVii", (void *)&SC_AtomicXor, true },
     { "_Z11rsAtomicXorPVjj", (void *)&SC_AtomicXor, true },
     { "_Z11rsAtomicMinPVii", (void *)&SC_AtomicMin, true },
-    { "_Z11rsAtomicMinPVjj", (void *)&SC_AtomicMin, true },
+    { "_Z11rsAtomicMinPVjj", (void *)&SC_AtomicUMin, true },
     { "_Z11rsAtomicMaxPVii", (void *)&SC_AtomicMax, true },
-    { "_Z11rsAtomicMaxPVjj", (void *)&SC_AtomicMax, true },
+    { "_Z11rsAtomicMaxPVjj", (void *)&SC_AtomicUMax, true },
     { "_Z11rsAtomicCasPViii", (void *)&SC_AtomicCas, true },
     { "_Z11rsAtomicCasPVjjj", (void *)&SC_AtomicCas, true },
 
diff --git a/libs/rs/scriptc/rs_atomic.rsh b/libs/rs/scriptc/rs_atomic.rsh
index 87c6c02..a455edd 100644
--- a/libs/rs/scriptc/rs_atomic.rsh
+++ b/libs/rs/scriptc/rs_atomic.rsh
@@ -242,7 +242,7 @@
  * @return old value
  */
 extern uint32_t __attribute__((overloadable))
-    rsAtomicCas(volatile uint32_t* addr, int32_t compareValue, int32_t newValue);
+    rsAtomicCas(volatile uint32_t* addr, uint32_t compareValue, uint32_t newValue);
 
 #endif //defined(RS_VERSION) && (RS_VERSION >= 14)
 
diff --git a/tests/RenderScriptTests/tests/src/com/android/rs/test/RSTestCore.java b/tests/RenderScriptTests/tests/src/com/android/rs/test/RSTestCore.java
index c038478..5ab2c58 100644
--- a/tests/RenderScriptTests/tests/src/com/android/rs/test/RSTestCore.java
+++ b/tests/RenderScriptTests/tests/src/com/android/rs/test/RSTestCore.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008-2011 The Android Open Source Project
+ * Copyright (C) 2008-2012 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -72,6 +72,7 @@
         unitTests.add(new UT_alloc(this, mRes, mCtx));
         unitTests.add(new UT_refcount(this, mRes, mCtx));
         unitTests.add(new UT_foreach(this, mRes, mCtx));
+        unitTests.add(new UT_atomic(this, mRes, mCtx));
         unitTests.add(new UT_math(this, mRes, mCtx));
         unitTests.add(new UT_fp_mad(this, mRes, mCtx));
         /*
diff --git a/tests/RenderScriptTests/tests/src/com/android/rs/test/UT_atomic.java b/tests/RenderScriptTests/tests/src/com/android/rs/test/UT_atomic.java
new file mode 100644
index 0000000..267c5b2
--- /dev/null
+++ b/tests/RenderScriptTests/tests/src/com/android/rs/test/UT_atomic.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.rs.test;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.renderscript.*;
+
+public class UT_atomic extends UnitTest {
+    private Resources mRes;
+
+    protected UT_atomic(RSTestCore rstc, Resources res, Context ctx) {
+        super(rstc, "Atomics", ctx);
+        mRes = res;
+    }
+
+    public void run() {
+        RenderScript pRS = RenderScript.create(mCtx);
+        ScriptC_atomic s = new ScriptC_atomic(pRS, mRes, R.raw.atomic);
+        pRS.setMessageHandler(mRsMessage);
+        s.invoke_atomic_test();
+        pRS.finish();
+        waitForMessage();
+        pRS.destroy();
+    }
+}
diff --git a/tests/RenderScriptTests/tests/src/com/android/rs/test/atomic.rs b/tests/RenderScriptTests/tests/src/com/android/rs/test/atomic.rs
new file mode 100644
index 0000000..f0a5041
--- /dev/null
+++ b/tests/RenderScriptTests/tests/src/com/android/rs/test/atomic.rs
@@ -0,0 +1,77 @@
+#include "shared.rsh"
+
+// Testing atomic operations
+static bool testUMax(uint32_t dst, uint32_t src) {
+    bool failed = false;
+    uint32_t old = dst;
+    uint32_t expect = (dst > src ? dst : src);
+    uint32_t ret = rsAtomicMax(&dst, src);
+    _RS_ASSERT(old == ret);
+    _RS_ASSERT(dst == expect);
+    return failed;
+}
+
+static bool testUMin(uint32_t dst, uint32_t src) {
+    bool failed = false;
+    uint32_t old = dst;
+    uint32_t expect = (dst < src ? dst : src);
+    uint32_t ret = rsAtomicMin(&dst, src);
+    _RS_ASSERT(old == ret);
+    _RS_ASSERT(dst == expect);
+    return failed;
+}
+
+static bool testUCas(uint32_t dst, uint32_t cmp, uint32_t swp) {
+    bool failed = false;
+    uint32_t old = dst;
+    uint32_t expect = (dst == cmp ? swp : dst);
+    uint32_t ret = rsAtomicCas(&dst, cmp, swp);
+    _RS_ASSERT(old == ret);
+    _RS_ASSERT(dst == expect);
+    return failed;
+}
+
+static bool test_atomics() {
+    bool failed = false;
+
+    failed |= testUMax(5, 6);
+    failed |= testUMax(6, 5);
+    failed |= testUMax(5, 0xf0000006);
+    failed |= testUMax(0xf0000006, 5);
+
+    failed |= testUMin(5, 6);
+    failed |= testUMin(6, 5);
+    failed |= testUMin(5, 0xf0000006);
+    failed |= testUMin(0xf0000006, 5);
+
+    failed |= testUCas(4, 4, 5);
+    failed |= testUCas(4, 5, 5);
+    failed |= testUCas(5, 5, 4);
+    failed |= testUCas(5, 4, 4);
+    failed |= testUCas(0xf0000004, 0xf0000004, 0xf0000005);
+    failed |= testUCas(0xf0000004, 0xf0000005, 0xf0000005);
+    failed |= testUCas(0xf0000005, 0xf0000005, 0xf0000004);
+    failed |= testUCas(0xf0000005, 0xf0000004, 0xf0000004);
+
+    if (failed) {
+        rsDebug("test_atomics FAILED", 0);
+    }
+    else {
+        rsDebug("test_atomics PASSED", 0);
+    }
+
+    return failed;
+}
+
+void atomic_test() {
+    bool failed = false;
+    failed |= test_atomics();
+
+    if (failed) {
+        rsSendToClientBlocking(RS_MSG_TEST_FAILED);
+    }
+    else {
+        rsSendToClientBlocking(RS_MSG_TEST_PASSED);
+    }
+}
+