oops, fix more register clobberage

fixes crash with -threaded -debug for me

diff --git a/rts/PrimOps.cmm b/rts/PrimOps.cmm
index e8b216f..54c165c 100644 (file)
--- a/rts/PrimOps.cmm
+++ b/rts/PrimOps.cmm
@@ -1740,7 +1740,7 @@ putMVarzh_fast
 
        /* actually perform the takeMVar */
        tso = StgMVar_head(mvar);
-       PerformTake(tso, R2);
+       PerformTake(tso, val);
         if (TO_W_(StgTSO_flags(tso)) & TSO_DIRTY == 0) {
             foreign "C" dirty_TSO(MyCapability() "ptr", tso "ptr") [];
         }
@@ -1763,7 +1763,7 @@ putMVarzh_fast
     else
     {
        /* No further takes, the MVar is now full. */
-       StgMVar_value(mvar) = R2;
+       StgMVar_value(mvar) = val;
 
 #if defined(THREADED_RTS)
        unlockClosure(mvar, stg_MVAR_DIRTY_info);