1 files changed, 10 insertions, 0 deletions
diff --git a/target-m68k/op.c b/target-m68k/op.c
index 69d1fde9a7..d483488be8 100644
--- a/target-m68k/op.c
+++ b/target-m68k/op.c
@@ -170,6 +170,16 @@ OP(btest)
     FORCE_RET();
 }
 
+OP(ff1)
+{
+    uint32_t arg = get_op(PARAM2);
+    int n;
+    for (n = 32; arg; n--)
+        arg >>= 1;
+    set_op(PARAM1, n);
+    FORCE_RET();
+}
+
 OP(subx_cc)
 {
     uint32_t op1 = get_op(PARAM1);