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changeset 5737:946a8294ab15

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8024919: G1: SPECjbb2013 crashes due to a broken object reference Summary: Pass correct new value to post_barrer() in Unsafe.getAndSetObject() C1 intrinsic Reviewed-by: kvn, roland
author iveresov
date Thu, 31 Oct 2013 04:16:40 -0700
parents 4d3575d37a07
children 2dcd0bd2920d
files src/cpu/x86/vm/c1_LIRGenerator_x86.cpp
diffstat 1 files changed, 5 insertions(+), 6 deletions(-) [+]
line wrap: on
line diff
--- a/src/cpu/x86/vm/c1_LIRGenerator_x86.cpp	Wed Oct 30 22:55:11 2013 -0700
+++ b/src/cpu/x86/vm/c1_LIRGenerator_x86.cpp	Thu Oct 31 04:16:40 2013 -0700
@@ -1468,19 +1468,18 @@
     addr = new LIR_Address(src.result(), offset, type);
   }
 
-  if (data != dst) {
-    __ move(data, dst);
-    data = dst;
-  }
+  // Because we want a 2-arg form of xchg and xadd
+  __ move(data, dst);
+
   if (x->is_add()) {
-    __ xadd(LIR_OprFact::address(addr), data, dst, LIR_OprFact::illegalOpr);
+    __ xadd(LIR_OprFact::address(addr), dst, dst, LIR_OprFact::illegalOpr);
   } else {
     if (is_obj) {
       // Do the pre-write barrier, if any.
       pre_barrier(LIR_OprFact::address(addr), LIR_OprFact::illegalOpr /* pre_val */,
                   true /* do_load */, false /* patch */, NULL);
     }
-    __ xchg(LIR_OprFact::address(addr), data, dst, LIR_OprFact::illegalOpr);
+    __ xchg(LIR_OprFact::address(addr), dst, dst, LIR_OprFact::illegalOpr);
     if (is_obj) {
       // Seems to be a precise address
       post_barrier(LIR_OprFact::address(addr), data);