src/cpu/x86/vm/c2_init_x86.cpp

rev 8344 : 8076276: Add support for AVX512
Reviewed-by: kvn, roland
Contributed-by: michael.c.berg@intel.com

*** 23,32 ****
--- 23,33 ----
   */
  
  #include "precompiled.hpp"
  #include "opto/compile.hpp"
  #include "opto/node.hpp"
+ #include "opto/optoreg.hpp"
  
  // processor dependent initialization for i486
  
  void Compile::pd_compiler2_init() {
    guarantee(CodeEntryAlignment >= InteriorEntryAlignment, "" );
*** 35,40 ****
--- 36,61 ----
  #ifndef AMD64
    if (!VM_Version::supports_cmov()) {
      ConditionalMoveLimit = 0;
    }
  #endif // AMD64
+ 
+   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::invalidate(j);
+       }
+     }
+     // 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::invalidate(i);
+     }
+   }
  }