#define dSP register SV **sp = PL_stack_sp
#define djSP dSP
#define dMARK register SV **mark = PL_stack_base + POPMARK
-#define dORIGMARK I32 origmark = mark - PL_stack_base
-#define SETORIGMARK origmark = mark - PL_stack_base
+#define dORIGMARK const I32 origmark = mark - PL_stack_base
#define ORIGMARK (PL_stack_base + origmark)
#define SPAGAIN sp = PL_stack_sp