Mercurial > hg > truffle
comparison src/share/vm/runtime/arguments.cpp @ 642:660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
Summary: Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb.
Reviewed-by: never, twisti, jcoomes, coleenp
author | kvn |
---|---|
date | Thu, 12 Mar 2009 10:37:46 -0700 |
parents | dca06e7f503d |
children | bd441136a5ce |
comparison
equal
deleted
inserted
replaced
641:6af0a709d52b | 642:660978a2a31a |
---|---|
1209 } | 1209 } |
1210 #ifdef _WIN64 | 1210 #ifdef _WIN64 |
1211 if (UseLargePages && UseCompressedOops) { | 1211 if (UseLargePages && UseCompressedOops) { |
1212 // Cannot allocate guard pages for implicit checks in indexed addressing | 1212 // Cannot allocate guard pages for implicit checks in indexed addressing |
1213 // mode, when large pages are specified on windows. | 1213 // mode, when large pages are specified on windows. |
1214 FLAG_SET_DEFAULT(UseImplicitNullCheckForNarrowOop, false); | 1214 // This flag could be switched ON if narrow oop base address is set to 0, |
1215 // see code in Universe::initialize_heap(). | |
1216 Universe::set_narrow_oop_use_implicit_null_checks(false); | |
1215 } | 1217 } |
1216 #endif // _WIN64 | 1218 #endif // _WIN64 |
1217 } else { | 1219 } else { |
1218 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { | 1220 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { |
1219 warning("Max heap size too large for Compressed Oops"); | 1221 warning("Max heap size too large for Compressed Oops"); |