stdin

diff --git a/libavutil/arm/intmath.h b/libavutil/arm/intmath.h
index 65e42c5..ef0889a 100644
--- a/libavutil/arm/intmath.h
+++ b/libavutil/arm/intmath.h
@@ -73,9 +73,14 @@ static av_always_inline av_const int av_clip_intp2_arm(int a, int p)
 #define av_clip_uintp2 av_clip_uintp2_arm
 static av_always_inline av_const unsigned av_clip_uintp2_arm(int a, int p)
 {
-    unsigned x;
-    __asm__ ("usat %0, %2, %1" : "=r"(x) : "r"(a), "i"(p));
-    return x;
+    if (av_builtin_constant_p(p)) {
+        unsigned x;
+        __asm__ ("usat %0, %2, %1" : "=r"(x) : "r"(a), "i"(p));
+        return x;
+    } else {
+        if (a & ~((1<<p) - 1)) return -a >> 31 & ((1<<p) - 1);
+        else                   return  a;
+    }
 }
 
 #define av_sat_add32 av_sat_add32_arm