1 files changed, 3 insertions, 8 deletions

diff --git a/src/x86_64/prelude.asm b/src/x86_64/prelude.asm
index c9ef823..05762b9 100644
--- a/src/x86_64/prelude.asm
+++ b/src/x86_64/prelude.asm
@@ -108,14 +108,9 @@ not_string:
 
     ;; is fixnum?
     mov     rax, rdi
+    and     rax, FIXNUM_MASK
+    cmp     rax, FIXNUM_TAG
+    jne     display_end
     call    printdln
 display_end:
     ret
-
-global  _start
-_start:
-    ;; point `rdi` to the start of the heap.
-    mov     r15, bdl_heap
-
-    ;; make sure the last element in the stack is the nil value.
-    push    NIL_VAL