diff --git a/cpu_ref/rsCpuIntrinsicConvolve3x3.cpp b/cpu_ref/rsCpuIntrinsicConvolve3x3.cpp
new file mode 100644
index 0000000..18a5311
--- /dev/null
+++ b/cpu_ref/rsCpuIntrinsicConvolve3x3.cpp
@@ -0,0 +1,166 @@
+/*
+ * 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.
+ */
+
+
+#include "rsCpuIntrinsic.h"
+#include "rsCpuIntrinsicInlines.h"
+
+using namespace android;
+using namespace android::renderscript;
+
+namespace android {
+namespace renderscript {
+
+
+class RsdCpuScriptIntrinsicConvolve3x3 : public RsdCpuScriptIntrinsic {
+public:
+    virtual void populateScript(Script *);
+    virtual void invokeFreeChildren();
+
+    virtual void setGlobalVar(uint32_t slot, const void *data, size_t dataLength);
+    virtual void setGlobalObj(uint32_t slot, ObjectBase *data);
+
+    virtual ~RsdCpuScriptIntrinsicConvolve3x3();
+    RsdCpuScriptIntrinsicConvolve3x3(RsdCpuReferenceImpl *ctx, const Script *s);
+
+protected:
+    float fp[16];
+    short ip[16];
+    ObjectBaseRef<Allocation> alloc;
+
+    static void kernel(const RsForEachStubParamStruct *p,
+                       uint32_t xstart, uint32_t xend,
+                       uint32_t instep, uint32_t outstep);
+};
+
+}
+}
+
+
+void RsdCpuScriptIntrinsicConvolve3x3::setGlobalObj(uint32_t slot, ObjectBase *data) {
+    rsAssert(slot == 1);
+    alloc.set(static_cast<Allocation *>(data));
+}
+
+void RsdCpuScriptIntrinsicConvolve3x3::setGlobalVar(uint32_t slot, const void *data,
+                                                    size_t dataLength) {
+    rsAssert(slot == 0);
+    memcpy (&fp, data, dataLength);
+    for(int ct=0; ct < 9; ct++) {
+        ip[ct] = (short)(fp[ct] * 255.f + 0.5f);
+    }
+}
+
+extern "C" void rsdIntrinsicConvolve3x3_K(void *dst, const void *y0, const void *y1,
+                                          const void *y2, const short *coef, uint32_t count);
+
+
+static void ConvolveOne(const RsForEachStubParamStruct *p, uint32_t x, uchar4 *out,
+                        const uchar4 *py0, const uchar4 *py1, const uchar4 *py2,
+                        const float* coeff) {
+
+    uint32_t x1 = rsMax((int32_t)x-1, 0);
+    uint32_t x2 = rsMin((int32_t)x+1, (int32_t)p->dimX);
+
+    float4 px = convert_float4(py0[x1]) * coeff[0] +
+                convert_float4(py0[x]) * coeff[1] +
+                convert_float4(py0[x2]) * coeff[2] +
+                convert_float4(py1[x1]) * coeff[3] +
+                convert_float4(py1[x]) * coeff[4] +
+                convert_float4(py1[x2]) * coeff[5] +
+                convert_float4(py2[x1]) * coeff[6] +
+                convert_float4(py2[x]) * coeff[7] +
+                convert_float4(py2[x2]) * coeff[8];
+
+    px = clamp(px, 0.f, 255.f);
+    uchar4 o = {(uchar)px.x, (uchar)px.y, (uchar)px.z, (uchar)px.w};
+    *out = o;
+}
+
+void RsdCpuScriptIntrinsicConvolve3x3::kernel(const RsForEachStubParamStruct *p,
+                                              uint32_t xstart, uint32_t xend,
+                                              uint32_t instep, uint32_t outstep) {
+    RsdCpuScriptIntrinsicConvolve3x3 *cp = (RsdCpuScriptIntrinsicConvolve3x3 *)p->usr;
+
+    if (!cp->alloc.get()) {
+        ALOGE("Convolve3x3 executed without input, skipping");
+        return;
+    }
+    const uchar *pin = (const uchar *)cp->alloc->mHal.drvState.lod[0].mallocPtr;
+    const size_t stride = cp->alloc->mHal.drvState.lod[0].stride;
+
+    uint32_t y1 = rsMin((int32_t)p->y + 1, (int32_t)(p->dimY-1));
+    uint32_t y2 = rsMax((int32_t)p->y - 1, 0);
+    const uchar4 *py0 = (const uchar4 *)(pin + stride * y2);
+    const uchar4 *py1 = (const uchar4 *)(pin + stride * p->y);
+    const uchar4 *py2 = (const uchar4 *)(pin + stride * y1);
+
+    uchar4 *out = (uchar4 *)p->out;
+    uint32_t x1 = xstart;
+    uint32_t x2 = xend;
+    if(x1 == 0) {
+        ConvolveOne(p, 0, out, py0, py1, py2, cp->fp);
+        x1 ++;
+        out++;
+    }
+
+    if(x2 > x1) {
+#if defined(ARCH_ARM_HAVE_NEON)
+        int32_t len = (x2 - x1 - 1) >> 1;
+        if(len > 0) {
+            rsdIntrinsicConvolve3x3_K(out, &py0[x1-1], &py1[x1-1], &py2[x1-1], cp->ip, len);
+            x1 += len << 1;
+            out += len << 1;
+        }
+#endif
+
+        while(x1 != x2) {
+            ConvolveOne(p, x1, out, py0, py1, py2, cp->fp);
+            out++;
+            x1++;
+        }
+    }
+}
+
+RsdCpuScriptIntrinsicConvolve3x3::RsdCpuScriptIntrinsicConvolve3x3(
+            RsdCpuReferenceImpl *ctx, const Script *s)
+            : RsdCpuScriptIntrinsic(ctx, s, RS_SCRIPT_INTRINSIC_ID_CONVOLVE_3x3) {
+
+    mRootPtr = &kernel;
+    for(int ct=0; ct < 9; ct++) {
+        fp[ct] = 1.f / 9.f;
+        ip[ct] = (short)(fp[ct] * 255.f + 0.5f);
+    }
+}
+
+RsdCpuScriptIntrinsicConvolve3x3::~RsdCpuScriptIntrinsicConvolve3x3() {
+}
+
+void RsdCpuScriptIntrinsicConvolve3x3::populateScript(Script *s) {
+    s->mHal.info.exportedVariableCount = 2;
+}
+
+void RsdCpuScriptIntrinsicConvolve3x3::invokeFreeChildren() {
+    alloc.clear();
+}
+
+
+RsdCpuScriptImpl * rsdIntrinsic_Convolve3x3(RsdCpuReferenceImpl *ctx, const Script *s) {
+
+    return new RsdCpuScriptIntrinsicConvolve3x3(ctx, s);
+}
+
+