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 /*

  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

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  */

 #ifndef CPU_X86_VM_C1_LINEARSCAN_X86_HPP

 #define CPU_X86_VM_C1_LINEARSCAN_X86_HPP

 inline bool LinearScan::is_processed_reg_num(int reg_num) {

 #ifndef _LP64

   // rsp and rbp (numbers 6 ancd 7) are ignored

   assert(FrameMap::rsp_opr->cpu_regnr() == 6, "wrong assumption below");

   assert(FrameMap::rbp_opr->cpu_regnr() == 7, "wrong assumption below");

   assert(reg_num >= 0, "invalid reg_num");

   return reg_num < 6 || reg_num > 7;

 #else

   // rsp and rbp, r10, r15 (numbers 6 ancd 7) are ignored

   assert(FrameMap::r10_opr->cpu_regnr() == 12, "wrong assumption below");

   assert(FrameMap::r15_opr->cpu_regnr() == 13, "wrong assumption below");

   assert(FrameMap::rsp_opr->cpu_regnrLo() == 14, "wrong assumption below");

   assert(FrameMap::rbp_opr->cpu_regnrLo() == 15, "wrong assumption below");

   assert(reg_num >= 0, "invalid reg_num");

   return reg_num < 12 || reg_num > 15;

 #endif // _LP64

 }

 inline int LinearScan::num_physical_regs(BasicType type) {

   // Intel requires two cpu registers for long,

   // but requires only one fpu register for double

   if (LP64_ONLY(false &&) type == T_LONG) {

     return 2;

   }

   return 1;

 }

 inline bool LinearScan::requires_adjacent_regs(BasicType type) {

   return false;

 }

 inline bool LinearScan::is_caller_save(int assigned_reg) {

   assert(assigned_reg >= 0 && assigned_reg < nof_regs, "should call this only for registers");

   return true; // no callee-saved registers on Intel

 }

 inline void LinearScan::pd_add_temps(LIR_Op* op) {

   switch (op->code()) {

     case lir_tan:

     case lir_sin:

     case lir_cos: {

       // The slow path for these functions may need to save and

       // restore all live registers but we don't want to save and

       // restore everything all the time, so mark the xmms as being

       // killed.  If the slow path were explicit or we could propagate

       // live register masks down to the assembly we could do better

       // but we don't have any easy way to do that right now.  We

       // could also consider not killing all xmm registers if we

       // assume that slow paths are uncommon but it's not clear that

       // would be a good idea.

       if (UseSSE > 0) {

 #ifndef PRODUCT

         if (TraceLinearScanLevel >= 2) {

           tty->print_cr("killing XMMs for trig");

         }

 #endif

         int op_id = op->id();

         for (int xmm = 0; xmm < FrameMap::nof_caller_save_xmm_regs; xmm++) {

           LIR_Opr opr = FrameMap::caller_save_xmm_reg_at(xmm);

           add_temp(reg_num(opr), op_id, noUse, T_ILLEGAL);

         }

       }

       break;

     }

   }

 }

 // Implementation of LinearScanWalker

 inline bool LinearScanWalker::pd_init_regs_for_alloc(Interval* cur) {

   if (allocator()->gen()->is_vreg_flag_set(cur->reg_num(), LIRGenerator::byte_reg)) {

     assert(cur->type() != T_FLOAT && cur->type() != T_DOUBLE, "cpu regs only");

     _first_reg = pd_first_byte_reg;

     _last_reg = pd_last_byte_reg;

     return true;

   } else if ((UseSSE >= 1 && cur->type() == T_FLOAT) || (UseSSE >= 2 && cur->type() == T_DOUBLE)) {

     _first_reg = pd_first_xmm_reg;

     _last_reg = pd_last_xmm_reg;

     return true;

   }

   return false;

 }

 class FpuStackAllocator VALUE_OBJ_CLASS_SPEC {

  private:

   Compilation* _compilation;

   LinearScan* _allocator;

   LIR_OpVisitState visitor;

   LIR_List* _lir;

   int _pos;

   FpuStackSim _sim;

   FpuStackSim _temp_sim;

   bool _debug_information_computed;

   LinearScan*   allocator()                      { return _allocator; }

   Compilation*  compilation() const              { return _compilation; }

   // unified bailout support

   void          bailout(const char* msg) const   { compilation()->bailout(msg); }

   bool          bailed_out() const               { return compilation()->bailed_out(); }

   int pos() { return _pos; }

   void set_pos(int pos) { _pos = pos; }

   LIR_Op* cur_op() { return lir()->instructions_list()->at(pos()); }

   LIR_List* lir() { return _lir; }

   void set_lir(LIR_List* lir) { _lir = lir; }

   FpuStackSim* sim() { return &_sim; }

   FpuStackSim* temp_sim() { return &_temp_sim; }

   int fpu_num(LIR_Opr opr);

   int tos_offset(LIR_Opr opr);

   LIR_Opr to_fpu_stack_top(LIR_Opr opr, bool dont_check_offset = false);

   // Helper functions for handling operations

   void insert_op(LIR_Op* op);

   void insert_exchange(int offset);

   void insert_exchange(LIR_Opr opr);

   void insert_free(int offset);

   void insert_free_if_dead(LIR_Opr opr);

   void insert_free_if_dead(LIR_Opr opr, LIR_Opr ignore);

   void insert_copy(LIR_Opr from, LIR_Opr to);

   void do_rename(LIR_Opr from, LIR_Opr to);

   void do_push(LIR_Opr opr);

   void pop_if_last_use(LIR_Op* op, LIR_Opr opr);

   void pop_always(LIR_Op* op, LIR_Opr opr);

   void clear_fpu_stack(LIR_Opr preserve);

   void handle_op1(LIR_Op1* op1);

   void handle_op2(LIR_Op2* op2);

   void handle_opCall(LIR_OpCall* opCall);

   void compute_debug_information(LIR_Op* op);

   void allocate_exception_handler(XHandler* xhandler);

   void allocate_block(BlockBegin* block);

 #ifndef PRODUCT

   void check_invalid_lir_op(LIR_Op* op);

 #endif

   // Helper functions for merging of fpu stacks

   void merge_insert_add(LIR_List* instrs, FpuStackSim* cur_sim, int reg);

   void merge_insert_xchg(LIR_List* instrs, FpuStackSim* cur_sim, int slot);

   void merge_insert_pop(LIR_List* instrs, FpuStackSim* cur_sim);

   bool merge_rename(FpuStackSim* cur_sim, FpuStackSim* sux_sim, int start_slot, int change_slot);

   void merge_fpu_stack(LIR_List* instrs, FpuStackSim* cur_sim, FpuStackSim* sux_sim);

   void merge_cleanup_fpu_stack(LIR_List* instrs, FpuStackSim* cur_sim, BitMap& live_fpu_regs);

   bool merge_fpu_stack_with_successors(BlockBegin* block);

  public:

   LIR_Opr to_fpu_stack(LIR_Opr opr); // used by LinearScan for creation of debug information

   FpuStackAllocator(Compilation* compilation, LinearScan* allocator);

   void allocate();

 };

 #endif // CPU_X86_VM_C1_LINEARSCAN_X86_HPP