src/share/vm/opto/c2compiler.cpp

*** 57,66 ****
--- 57,90 ----
      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 */ &&