diff --git a/tests/checkasm/cdef.c b/tests/checkasm/cdef.c
new file mode 100644
index 00000000..34b9f88e
--- /dev/null
+++ b/tests/checkasm/cdef.c
@@ -0,0 +1,69 @@
+/*
+ * Copyright © 2018, VideoLAN and dav1d authors
+ * Copyright © 2018, Two Orioles, LLC
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "tests/checkasm/checkasm.h"
+
+#include <string.h>
+
+#include "src/levels.h"
+#include "src/cdef.h"
+
+static void init_tmp(pixel *buf, const ptrdiff_t stride,
+                     const int w, const int h)
+{
+    for (int y = 0; y < h; y++) {
+        for (int x = 0; x < w; x++)
+            buf[x] = rand() & ((1 << BITDEPTH) - 1);
+        buf += PXSTRIDE(stride);
+    }
+}
+
+static void check_cdef_direction(const cdef_dir_fn fn) {
+    ALIGN_STK_32(pixel, src, 8 * 8,);
+
+    declare_func(int, pixel *src, ptrdiff_t dst_stride, unsigned *var);
+
+    init_tmp(src, 8 * sizeof(pixel), 8, 8);
+
+    if (check_func(fn, "cdef_dir_%dbpc", BITDEPTH)) {
+        unsigned c_var, a_var;
+
+        const int c_dir = call_ref(src, 8 * sizeof(pixel), &c_var);
+        const int a_dir = call_new(src, 8 * sizeof(pixel), &a_var);
+        if (c_var != a_var || c_dir != a_dir) fail();
+        bench_new(src, 8 * sizeof(pixel), &a_var);
+    }
+    report("cdef_dir");
+}
+
+void bitfn(checkasm_check_cdef)(void) {
+    Dav1dCdefDSPContext c;
+
+    bitfn(dav1d_cdef_dsp_init)(&c);
+
+    check_cdef_direction(c.dir);
+}
diff --git a/tests/checkasm/checkasm.c b/tests/checkasm/checkasm.c
index e90c155c..5d6330ba 100644
--- a/tests/checkasm/checkasm.c
+++ b/tests/checkasm/checkasm.c
@@ -62,6 +62,7 @@ static const struct {
     void (*func)(void);
 } tests[] = {
 #if CONFIG_8BPC
+    { "cdef_8bpc", checkasm_check_cdef_8bpc },
     { "ipred_8bpc", checkasm_check_ipred_8bpc },
     { "itx_8bpc", checkasm_check_itx_8bpc },
     { "loopfilter_8bpc", checkasm_check_loopfilter_8bpc },
@@ -69,6 +70,7 @@ static const struct {
     { "mc_8bpc", checkasm_check_mc_8bpc },
 #endif
 #if CONFIG_10BPC
+    { "cdef_10bpc", checkasm_check_cdef_10bpc },
     { "ipred_10bpc", checkasm_check_ipred_10bpc },
     { "itx_10bpc", checkasm_check_itx_10bpc },
     { "loopfilter_10bpc", checkasm_check_loopfilter_10bpc },
diff --git a/tests/checkasm/checkasm.h b/tests/checkasm/checkasm.h
index 19626c24..5bbbd429 100644
--- a/tests/checkasm/checkasm.h
+++ b/tests/checkasm/checkasm.h
@@ -36,6 +36,9 @@
 #include "include/common/attributes.h"
 #include "include/common/intops.h"
 
+void checkasm_check_cdef_8bpc(void);
+void checkasm_check_cdef_10bpc(void);
+
 void checkasm_check_ipred_8bpc(void);
 void checkasm_check_ipred_10bpc(void);
 
diff --git a/tests/meson.build b/tests/meson.build
index 00be051d..256e6c05 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -35,6 +35,7 @@ if is_asm_enabled
     checkasm_sources = files('checkasm/checkasm.c')
 
     checkasm_tmpl_sources = files(
+        'checkasm/cdef.c',
         'checkasm/ipred.c',
         'checkasm/itx.c',
         'checkasm/loopfilter.c',