W_[free] = p; \
bdescr_free(__bd) = free + WDS(1);
-#define recordMutable(p, regs) \
- W_ __p; \
- __p = p; \
- recordMutableCap(__p, TO_W_(bdescr_gen_no(Bdescr(__p))), regs)
+#define recordMutable(p, regs) \
+ W_ __p; \
+ W_ __bd; \
+ W_ __gen; \
+ __p = p; \
+ __bd = Bdescr(__p); \
+ __gen = TO_W_(bdescr_gen_no(__bd)); \
+ if (__gen > 0) { recordMutableCap(__p, __gen, regs); }
#endif /* CMM_H */