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diff src/cpu/sparc/vm/vm_version_sparc.cpp @ 3804:faa472957b38

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7059034: Use movxtod/movdtox on T4 Summary: Use new VIS3 mov instructions on T4 for move data between general and float registers. Reviewed-by: never, twisti
author kvn
date Fri, 08 Jul 2011 09:38:48 -0700
parents c04052fd6ae1
children 3d42f82cd811
line wrap: on
line diff
--- a/src/cpu/sparc/vm/vm_version_sparc.cpp	Thu Jul 07 10:51:07 2011 -0700
+++ b/src/cpu/sparc/vm/vm_version_sparc.cpp	Fri Jul 08 09:38:48 2011 -0700
@@ -144,6 +144,18 @@
   // buf is started with ", " or is empty
   _features_str = strdup(strlen(buf) > 2 ? buf + 2 : buf);
 
+  // UseVIS is set to the smallest of what hardware supports and what
+  // the command line requires.  I.e., you cannot set UseVIS to 3 on
+  // older UltraSparc which do not support it.
+  if (UseVIS > 3) UseVIS=3;
+  if (UseVIS < 0) UseVIS=0;
+  if (!has_vis3()) // Drop to 2 if no VIS3 support
+    UseVIS = MIN2((intx)2,UseVIS);
+  if (!has_vis2()) // Drop to 1 if no VIS2 support
+    UseVIS = MIN2((intx)1,UseVIS);
+  if (!has_vis1()) // Drop to 0 if no VIS1 support
+    UseVIS = 0;
+
 #ifndef PRODUCT
   if (PrintMiscellaneous && Verbose) {
     tty->print("Allocation: ");