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diff src/share/vm/runtime/globals.hpp @ 642:660978a2a31a

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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 c6c601a0f2d6
children c771b7f43bbf
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line diff
--- a/src/share/vm/runtime/globals.hpp	Wed Mar 11 14:16:13 2009 -0700
+++ b/src/share/vm/runtime/globals.hpp	Thu Mar 12 10:37:46 2009 -0700
@@ -303,11 +303,14 @@
             "Use 32-bit object references in 64-bit VM. "                   \
             "lp64_product means flag is always constant in 32 bit VM")      \
                                                                             \
-  lp64_product(bool, CheckCompressedOops, trueInDebug,                      \
-            "generate checks in encoding/decoding code")                    \
-                                                                            \
-  product(bool, UseImplicitNullCheckForNarrowOop, true,                     \
-            "generate implicit null check in indexed addressing mode.")     \
+  notproduct(bool, CheckCompressedOops, true,                               \
+            "generate checks in encoding/decoding code in debug VM")        \
+                                                                            \
+  product_pd(uintx, HeapBaseMinAddress,                                     \
+            "OS specific low limit for heap base address")                  \
+                                                                            \
+  diagnostic(bool, PrintCompressedOopsMode, false,                          \
+            "Print compressed oops base address and encoding mode")         \
                                                                             \
   /* UseMembar is theoretically a temp flag used for memory barrier         \
    * removal testing.  It was supposed to be removed before FCS but has     \