src/share/vm/opto/c2compiler.cpp

@@ -57,10 +57,34 @@
     if (r->is_valid()) {
       OptoReg::vm2opto[r->value()] = i;
     }
   }
 
+#ifdef X86
+#ifdef _LP64
+  if (UseAVX < 3) {
+    int delta = XMMRegisterImpl::max_slots_per_register * XMMRegisterImpl::number_of_registers;
+    int bottom = ConcreteRegisterImpl::max_fpr;
+    int top = bottom + delta;
+    int middle = bottom + (delta / 2);
+    int xmm_slots = XMMRegisterImpl::max_slots_per_register;
+    int lower = xmm_slots / 2;
+    // mark bad every register that we cannot get to if AVX less than 3, we have all slots in the array
+    // Note: vm2opto is allocated to ConcreteRegisterImpl::number_of_registers
+    for (int i = bottom; i < middle; i+= xmm_slots) {
+      for( OptoReg::Name j=OptoReg::Name(i + lower); j<OptoReg::Name(i + xmm_slots); j = OptoReg::add(j,1) ) {
+        OptoReg::vm2opto[j] = OptoReg::Bad;
+      }
+    }
+    // mark the upper zmm bank bad and all the mask registers bad in this case
+    for( OptoReg::Name i=OptoReg::Name(middle); i<OptoReg::Name(_last_Mach_Reg-1); i = OptoReg::add(i,1) ) {
+      OptoReg::vm2opto[i] = OptoReg::Bad;
+    }
+  }
+#endif
+#endif
+
   // Check that runtime and architecture description agree on callee-saved-floats
   bool callee_saved_floats = false;
   for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) {
     // Is there a callee-saved float or double?
     if( register_save_policy[i] == 'E' /* callee-saved */ &&