From a2dca87759ba81bbe8fa714e3f5f357d4d158610 Mon Sep 17 00:00:00 2001 From: iveresov Date: Thu, 31 Oct 2013 04:16:40 -0700 Subject: [PATCH] 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 --- src/cpu/x86/vm/c1_LIRGenerator_x86.cpp | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/src/cpu/x86/vm/c1_LIRGenerator_x86.cpp b/src/cpu/x86/vm/c1_LIRGenerator_x86.cpp index 308befddc..4a30d597b 100644 --- a/src/cpu/x86/vm/c1_LIRGenerator_x86.cpp +++ b/src/cpu/x86/vm/c1_LIRGenerator_x86.cpp @@ -1468,19 +1468,18 @@ void LIRGenerator::do_UnsafeGetAndSetObject(UnsafeGetAndSetObject* x) { 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); -- GitLab