RFR (XS): 8133557: Missing test before a branch when checking for MethodCounters in TemplateTable::branch() on x86

[Richard Reingruber]

Hi,

this is a request for review of the following fix for bug 8133557 (https://bugs.openjdk.java.net/browse/JDK-8133557).

diff -r af60f1cb36f2 src/cpu/x86/vm/templateTable_x86.cpp
--- a/src/cpu/x86/vm/templateTable_x86.cpp	Mon Aug 10 10:39:19 2015 -0700
+++ b/src/cpu/x86/vm/templateTable_x86.cpp	Fri Aug 14 10:46:47 2015 +0200
@@ -2014,6 +2014,7 @@
      __ pop(rcx);
      __ pop(rdx);
      __ movptr(rax, Address(rcx, Method::method_counters_offset()));
+    __ testptr(rax, rax);
      __ jcc(Assembler::zero, dispatch);
      __ bind(has_counters);

Thanks,
Richard.