# HG changeset patch
# User tschatzl
# Date 1391703130 -3600
# Node ID 3dc1055f4e87cf3894092c6dcb5db2f740b56474
# Parent  2cff20331ca20594361c8c0d999ab3d5d9f00773
8033545: Missing volatile specifier in Bitmap::par_put_range_within_word
Summary: The method Bitmap::par_put_range_within_word reloads the original value during a CAS, which may be optimized away. Instead of reloading, use the value returned by Atomic::cmpxchg_ptr() for further processing.
Reviewed-by: tschatzl, brutisso, tonyp
Contributed-by: Matthias Braun <matthia.braun@sap.com>

diff -r 2cff20331ca2 -r 3dc1055f4e87 src/share/vm/utilities/bitMap.cpp
--- a/src/share/vm/utilities/bitMap.cpp	Thu Feb 06 14:12:43 2014 +0100
+++ b/src/share/vm/utilities/bitMap.cpp	Thu Feb 06 17:12:10 2014 +0100
@@ -107,7 +107,7 @@
     while (true) {
       intptr_t res = Atomic::cmpxchg_ptr(nw, pw, w);
       if (res == w) break;
-      w  = *pw;
+      w  = res;
       nw = value ? (w | ~mr) : (w & mr);
     }
   }