shithub: dav1d

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checkasm: Improve the cdef input randomization algorithm

Change the input buffer randomization algorithm to more readily
trigger issues with both under- and overflows in cdef_filter.

--- a/tests/checkasm/cdef.c

+++ b/tests/checkasm/cdef.c

@@ -40,8 +40,16 @@

 }

 static void init_tmp(pixel *buf, int n, const int bitdepth_max) {

-    while (n--)

-        *buf++ = rnd() & bitdepth_max;

+    const int fill_type = rnd() & 7;

+    if (fill_type == 0)

+        while (n--) /* check for cdef_filter underflows */

+            *buf++ = rnd() & 1;

+    else if (fill_type == 1)

+        while (n--) /* check for cdef_filter overflows */

+            *buf++ = bitdepth_max - (rnd() & 1);

+    else

+        while (n--)

+            *buf++ = rnd() & bitdepth_max;

 }

 static void check_cdef_filter(const cdef_fn fn, const int w, const int h) {