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-rw-r--r--includes/Cmm.h12
1 files changed, 8 insertions, 4 deletions
diff --git a/includes/Cmm.h b/includes/Cmm.h
index cecf92640b..715d2b2b0f 100644
--- a/includes/Cmm.h
+++ b/includes/Cmm.h
@@ -571,9 +571,13 @@
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 */