X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=includes%2FCmm.h;h=715d2b2b0f915fe6dac5c2da29c7dd146f09e62f;hb=7ea43827e739555c23f2b802a6a5eaf2a65570ae;hp=cecf92640bf807cfa8b19b5273c440ee3ed664d0;hpb=6015a94f9108a502150565577b66c23650796639;p=ghc-hetmet.git

diff --git a/includes/Cmm.h b/includes/Cmm.h
index cecf926..715d2b2 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 */