1.1 --- a/src/cpu/sparc/vm/vm_version_sparc.cpp Thu Apr 22 13:23:15 2010 -0700
1.2 +++ b/src/cpu/sparc/vm/vm_version_sparc.cpp Mon May 03 10:24:51 2010 -0700
1.3 @@ -104,6 +104,12 @@
1.4 if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {
1.5 FLAG_SET_DEFAULT(OptoLoopAlignment, 4);
1.6 }
1.7 + // When using CMS, we cannot use memset() in BOT updates because
1.8 + // the sun4v/CMT version in libc_psr uses BIS which exposes
1.9 + // "phantom zeros" to concurrent readers. See 6948537.
1.10 + if (FLAG_IS_DEFAULT(UseMemSetInBOT) && UseConcMarkSweepGC) {
1.11 + FLAG_SET_DEFAULT(UseMemSetInBOT, false);
1.12 + }
1.13 }
1.14
1.15 // Use hardware population count instruction if available.
