jdk8-mips64-public/hotspot: src/cpu/x86/vm/assembler

src/cpu/x86/vm/assembler_x86.hpp@7bb995fbd3c0 (annotated)

src/cpu/x86/vm/assembler_x86.hpp

Thu, 12 Mar 2009 18:16:36 -0700

author: trims
date: Thu, 12 Mar 2009 18:16:36 -0700
changeset 1063: 7bb995fbd3c0
parent 1059: 337400e7a5dd
child 1077: 660978a2a31a
permissions: -rw-r--r--

Merge

 /*
  * Copyright 1997-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 class BiasedLockingCounters;
 // Contains all the definitions needed for x86 assembly code generation.
 // Calling convention
 class Argument VALUE_OBJ_CLASS_SPEC {
  public:
   enum {
 #ifdef _LP64
 #ifdef _WIN64
     n_int_register_parameters_c   = 4, // rcx, rdx, r8, r9 (c_rarg0, c_rarg1, ...)
     n_float_register_parameters_c = 4,  // xmm0 - xmm3 (c_farg0, c_farg1, ... )
 #else
     n_int_register_parameters_c   = 6, // rdi, rsi, rdx, rcx, r8, r9 (c_rarg0, c_rarg1, ...)
     n_float_register_parameters_c = 8,  // xmm0 - xmm7 (c_farg0, c_farg1, ... )
 #endif // _WIN64
     n_int_register_parameters_j   = 6, // j_rarg0, j_rarg1, ...
     n_float_register_parameters_j = 8  // j_farg0, j_farg1, ...
 #else
     n_register_parameters = 0   // 0 registers used to pass arguments
 #endif // _LP64
   };
 };
 #ifdef _LP64
 // Symbolically name the register arguments used by the c calling convention.
 // Windows is different from linux/solaris. So much for standards...
 #ifdef _WIN64
 REGISTER_DECLARATION(Register, c_rarg0, rcx);
 REGISTER_DECLARATION(Register, c_rarg1, rdx);
 REGISTER_DECLARATION(Register, c_rarg2, r8);
 REGISTER_DECLARATION(Register, c_rarg3, r9);
 REGISTER_DECLARATION(XMMRegister, c_farg0, xmm0);
 REGISTER_DECLARATION(XMMRegister, c_farg1, xmm1);
 REGISTER_DECLARATION(XMMRegister, c_farg2, xmm2);
 REGISTER_DECLARATION(XMMRegister, c_farg3, xmm3);
 #else
 REGISTER_DECLARATION(Register, c_rarg0, rdi);
 REGISTER_DECLARATION(Register, c_rarg1, rsi);
 REGISTER_DECLARATION(Register, c_rarg2, rdx);
 REGISTER_DECLARATION(Register, c_rarg3, rcx);
 REGISTER_DECLARATION(Register, c_rarg4, r8);
 REGISTER_DECLARATION(Register, c_rarg5, r9);
 REGISTER_DECLARATION(XMMRegister, c_farg0, xmm0);
 REGISTER_DECLARATION(XMMRegister, c_farg1, xmm1);
 REGISTER_DECLARATION(XMMRegister, c_farg2, xmm2);
 REGISTER_DECLARATION(XMMRegister, c_farg3, xmm3);
 REGISTER_DECLARATION(XMMRegister, c_farg4, xmm4);
 REGISTER_DECLARATION(XMMRegister, c_farg5, xmm5);
 REGISTER_DECLARATION(XMMRegister, c_farg6, xmm6);
 REGISTER_DECLARATION(XMMRegister, c_farg7, xmm7);
 #endif // _WIN64
 // Symbolically name the register arguments used by the Java calling convention.
 // We have control over the convention for java so we can do what we please.
 // What pleases us is to offset the java calling convention so that when
 // we call a suitable jni method the arguments are lined up and we don't
 // have to do little shuffling. A suitable jni method is non-static and a
 // small number of arguments (two fewer args on windows)
 //
 //        |-------------------------------------------------------|
 //        | c_rarg0   c_rarg1  c_rarg2 c_rarg3 c_rarg4 c_rarg5    |
 //        |-------------------------------------------------------|
 //        | rcx       rdx      r8      r9      rdi*    rsi*       | windows (* not a c_rarg)
 //        | rdi       rsi      rdx     rcx     r8      r9         | solaris/linux
 //        |-------------------------------------------------------|
 //        | j_rarg5   j_rarg0  j_rarg1 j_rarg2 j_rarg3 j_rarg4    |
 //        |-------------------------------------------------------|
 REGISTER_DECLARATION(Register, j_rarg0, c_rarg1);
 REGISTER_DECLARATION(Register, j_rarg1, c_rarg2);
 REGISTER_DECLARATION(Register, j_rarg2, c_rarg3);
 // Windows runs out of register args here
 #ifdef _WIN64
 REGISTER_DECLARATION(Register, j_rarg3, rdi);
 REGISTER_DECLARATION(Register, j_rarg4, rsi);
 #else
 REGISTER_DECLARATION(Register, j_rarg3, c_rarg4);
 REGISTER_DECLARATION(Register, j_rarg4, c_rarg5);
 #endif /* _WIN64 */
 REGISTER_DECLARATION(Register, j_rarg5, c_rarg0);
 REGISTER_DECLARATION(XMMRegister, j_farg0, xmm0);
 REGISTER_DECLARATION(XMMRegister, j_farg1, xmm1);
 REGISTER_DECLARATION(XMMRegister, j_farg2, xmm2);
 REGISTER_DECLARATION(XMMRegister, j_farg3, xmm3);
 REGISTER_DECLARATION(XMMRegister, j_farg4, xmm4);
 REGISTER_DECLARATION(XMMRegister, j_farg5, xmm5);
 REGISTER_DECLARATION(XMMRegister, j_farg6, xmm6);
 REGISTER_DECLARATION(XMMRegister, j_farg7, xmm7);
 REGISTER_DECLARATION(Register, rscratch1, r10);  // volatile
 REGISTER_DECLARATION(Register, rscratch2, r11);  // volatile
 REGISTER_DECLARATION(Register, r12_heapbase, r12); // callee-saved
 REGISTER_DECLARATION(Register, r15_thread, r15); // callee-saved
 #else
 // rscratch1 will apear in 32bit code that is dead but of course must compile
 // Using noreg ensures if the dead code is incorrectly live and executed it
 // will cause an assertion failure
 #define rscratch1 noreg
 #endif // _LP64
 // Address is an abstraction used to represent a memory location
 // using any of the amd64 addressing modes with one object.
 //
 // Note: A register location is represented via a Register, not
 //       via an address for efficiency & simplicity reasons.
 class ArrayAddress;
 class Address VALUE_OBJ_CLASS_SPEC {
  public:
   enum ScaleFactor {
     no_scale = -1,
     times_1  =  0,
     times_2  =  1,
     times_4  =  2,
     times_8  =  3,
     times_ptr = LP64_ONLY(times_8) NOT_LP64(times_4)
   };
   static ScaleFactor times(int size) {
     assert(size >= 1 && size <= 8 && is_power_of_2(size), "bad scale size");
     if (size == 8)  return times_8;
     if (size == 4)  return times_4;
     if (size == 2)  return times_2;
     return times_1;
   }
   static int scale_size(ScaleFactor scale) {
     assert(scale != no_scale, "");
     assert(((1 << (int)times_1) == 1 &&
             (1 << (int)times_2) == 2 &&
             (1 << (int)times_4) == 4 &&
             (1 << (int)times_8) == 8), "");
     return (1 << (int)scale);
   }
  private:
   Register         _base;
   Register         _index;
   ScaleFactor      _scale;
   int              _disp;
   RelocationHolder _rspec;
   // Easily misused constructors make them private
   // %%% can we make these go away?
   NOT_LP64(Address(address loc, RelocationHolder spec);)
   Address(int disp, address loc, relocInfo::relocType rtype);
   Address(int disp, address loc, RelocationHolder spec);
  public:
  int disp() { return _disp; }
   // creation
   Address()
     : _base(noreg),
       _index(noreg),
       _scale(no_scale),
       _disp(0) {
   }
   // No default displacement otherwise Register can be implicitly
   // converted to 0(Register) which is quite a different animal.
   Address(Register base, int disp)
     : _base(base),
       _index(noreg),
       _scale(no_scale),
       _disp(disp) {
   }
   Address(Register base, Register index, ScaleFactor scale, int disp = 0)
     : _base (base),
       _index(index),
       _scale(scale),
       _disp (disp) {
     assert(!index->is_valid() == (scale == Address::no_scale),
            "inconsistent address");
   }
   Address(Register base, RegisterConstant index, ScaleFactor scale = times_1, int disp = 0)
     : _base (base),
       _index(index.register_or_noreg()),
       _scale(scale),
       _disp (disp + (index.constant_or_zero() * scale_size(scale))) {
     if (!index.is_register())  scale = Address::no_scale;
     assert(!_index->is_valid() == (scale == Address::no_scale),
            "inconsistent address");
   }
   Address plus_disp(int disp) const {
     Address a = (*this);
     a._disp += disp;
     return a;
   }
   // The following two overloads are used in connection with the
   // ByteSize type (see sizes.hpp).  They simplify the use of
   // ByteSize'd arguments in assembly code. Note that their equivalent
   // for the optimized build are the member functions with int disp
   // argument since ByteSize is mapped to an int type in that case.
   //
   // Note: DO NOT introduce similar overloaded functions for WordSize
   // arguments as in the optimized mode, both ByteSize and WordSize
   // are mapped to the same type and thus the compiler cannot make a
   // distinction anymore (=> compiler errors).
 #ifdef ASSERT
   Address(Register base, ByteSize disp)
     : _base(base),
       _index(noreg),
       _scale(no_scale),
       _disp(in_bytes(disp)) {
   }
   Address(Register base, Register index, ScaleFactor scale, ByteSize disp)
     : _base(base),
       _index(index),
       _scale(scale),
       _disp(in_bytes(disp)) {
     assert(!index->is_valid() == (scale == Address::no_scale),
            "inconsistent address");
   }
   Address(Register base, RegisterConstant index, ScaleFactor scale, ByteSize disp)
     : _base (base),
       _index(index.register_or_noreg()),
       _scale(scale),
       _disp (in_bytes(disp) + (index.constant_or_zero() * scale_size(scale))) {
     if (!index.is_register())  scale = Address::no_scale;
     assert(!_index->is_valid() == (scale == Address::no_scale),
            "inconsistent address");
   }
 #endif // ASSERT
   // accessors
   bool        uses(Register reg) const { return _base == reg || _index == reg; }
   Register    base()             const { return _base;  }
   Register    index()            const { return _index; }
   ScaleFactor scale()            const { return _scale; }
   int         disp()             const { return _disp;  }
   // Convert the raw encoding form into the form expected by the constructor for
   // Address.  An index of 4 (rsp) corresponds to having no index, so convert
   // that to noreg for the Address constructor.
   static Address make_raw(int base, int index, int scale, int disp, bool disp_is_oop);
   static Address make_array(ArrayAddress);
  private:
   bool base_needs_rex() const {
     return _base != noreg && _base->encoding() >= 8;
   }
   bool index_needs_rex() const {
     return _index != noreg &&_index->encoding() >= 8;
   }
   relocInfo::relocType reloc() const { return _rspec.type(); }
   friend class Assembler;
   friend class MacroAssembler;
   friend class LIR_Assembler; // base/index/scale/disp
 };
 //
 // AddressLiteral has been split out from Address because operands of this type
 // need to be treated specially on 32bit vs. 64bit platforms. By splitting it out
 // the few instructions that need to deal with address literals are unique and the
 // MacroAssembler does not have to implement every instruction in the Assembler
 // in order to search for address literals that may need special handling depending
 // on the instruction and the platform. As small step on the way to merging i486/amd64
 // directories.
 //
 class AddressLiteral VALUE_OBJ_CLASS_SPEC {
   friend class ArrayAddress;
   RelocationHolder _rspec;
   // Typically we use AddressLiterals we want to use their rval
   // However in some situations we want the lval (effect address) of the item.
   // We provide a special factory for making those lvals.
   bool _is_lval;
   // If the target is far we'll need to load the ea of this to
   // a register to reach it. Otherwise if near we can do rip
   // relative addressing.
   address          _target;
  protected:
   // creation
   AddressLiteral()
     : _is_lval(false),
       _target(NULL)
   {}
   public:
   AddressLiteral(address target, relocInfo::relocType rtype);
   AddressLiteral(address target, RelocationHolder const& rspec)
     : _rspec(rspec),
       _is_lval(false),
       _target(target)
   {}
   AddressLiteral addr() {
     AddressLiteral ret = *this;
     ret._is_lval = true;
     return ret;
   }
  private:
   address target() { return _target; }
   bool is_lval() { return _is_lval; }
   relocInfo::relocType reloc() const { return _rspec.type(); }
   const RelocationHolder& rspec() const { return _rspec; }
   friend class Assembler;
   friend class MacroAssembler;
   friend class Address;
   friend class LIR_Assembler;
 };
 // Convience classes
 class RuntimeAddress: public AddressLiteral {
   public:
   RuntimeAddress(address target) : AddressLiteral(target, relocInfo::runtime_call_type) {}
 };
 class OopAddress: public AddressLiteral {
   public:
   OopAddress(address target) : AddressLiteral(target, relocInfo::oop_type){}
 };
 class ExternalAddress: public AddressLiteral {
   public:
   ExternalAddress(address target) : AddressLiteral(target, relocInfo::external_word_type){}
 };
 class InternalAddress: public AddressLiteral {
   public:
   InternalAddress(address target) : AddressLiteral(target, relocInfo::internal_word_type) {}
 };
 // x86 can do array addressing as a single operation since disp can be an absolute
 // address amd64 can't. We create a class that expresses the concept but does extra
 // magic on amd64 to get the final result
 class ArrayAddress VALUE_OBJ_CLASS_SPEC {
   private:
   AddressLiteral _base;
   Address        _index;
   public:
   ArrayAddress() {};
   ArrayAddress(AddressLiteral base, Address index): _base(base), _index(index) {};
   AddressLiteral base() { return _base; }
   Address index() { return _index; }
 };
 const int FPUStateSizeInWords = NOT_LP64(27) LP64_ONLY( 512 / wordSize);
 // The Intel x86/Amd64 Assembler: Pure assembler doing NO optimizations on the instruction
 // level (e.g. mov rax, 0 is not translated into xor rax, rax!); i.e., what you write
 // is what you get. The Assembler is generating code into a CodeBuffer.
 class Assembler : public AbstractAssembler  {
   friend class AbstractAssembler; // for the non-virtual hack
   friend class LIR_Assembler; // as_Address()
   friend class StubGenerator;
  public:
   enum Condition {                     // The x86 condition codes used for conditional jumps/moves.
     zero          = 0x4,
     notZero       = 0x5,
     equal         = 0x4,
     notEqual      = 0x5,
     less          = 0xc,
     lessEqual     = 0xe,
     greater       = 0xf,
     greaterEqual  = 0xd,
     below         = 0x2,
     belowEqual    = 0x6,
     above         = 0x7,
     aboveEqual    = 0x3,
     overflow      = 0x0,
     noOverflow    = 0x1,
     carrySet      = 0x2,
     carryClear    = 0x3,
     negative      = 0x8,
     positive      = 0x9,
     parity        = 0xa,
     noParity      = 0xb
   };
   enum Prefix {
     // segment overrides
     CS_segment = 0x2e,
     SS_segment = 0x36,
     DS_segment = 0x3e,
     ES_segment = 0x26,
     FS_segment = 0x64,
     GS_segment = 0x65,
     REX        = 0x40,
     REX_B      = 0x41,
     REX_X      = 0x42,
     REX_XB     = 0x43,
     REX_R      = 0x44,
     REX_RB     = 0x45,
     REX_RX     = 0x46,
     REX_RXB    = 0x47,
     REX_W      = 0x48,
     REX_WB     = 0x49,
     REX_WX     = 0x4A,
     REX_WXB    = 0x4B,
     REX_WR     = 0x4C,
     REX_WRB    = 0x4D,
     REX_WRX    = 0x4E,
     REX_WRXB   = 0x4F
   };
   enum WhichOperand {
     // input to locate_operand, and format code for relocations
     imm_operand  = 0,            // embedded 32-bit|64-bit immediate operand
     disp32_operand = 1,          // embedded 32-bit displacement or address
     call32_operand = 2,          // embedded 32-bit self-relative displacement
 #ifndef _LP64
     _WhichOperand_limit = 3
 #else
      narrow_oop_operand = 3,     // embedded 32-bit immediate narrow oop
     _WhichOperand_limit = 4
 #endif
   };
   // NOTE: The general philopsophy of the declarations here is that 64bit versions
   // of instructions are freely declared without the need for wrapping them an ifdef.
   // (Some dangerous instructions are ifdef's out of inappropriate jvm's.)
   // In the .cpp file the implementations are wrapped so that they are dropped out
   // of the resulting jvm. This is done mostly to keep the footprint of KERNEL
   // to the size it was prior to merging up the 32bit and 64bit assemblers.
   //
   // This does mean you'll get a linker/runtime error if you use a 64bit only instruction
   // in a 32bit vm. This is somewhat unfortunate but keeps the ifdef noise down.
 private:
   // 64bit prefixes
   int prefix_and_encode(int reg_enc, bool byteinst = false);
   int prefixq_and_encode(int reg_enc);
   int prefix_and_encode(int dst_enc, int src_enc, bool byteinst = false);
   int prefixq_and_encode(int dst_enc, int src_enc);
   void prefix(Register reg);
   void prefix(Address adr);
   void prefixq(Address adr);
   void prefix(Address adr, Register reg,  bool byteinst = false);
   void prefixq(Address adr, Register reg);
   void prefix(Address adr, XMMRegister reg);
   void prefetch_prefix(Address src);
   // Helper functions for groups of instructions
   void emit_arith_b(int op1, int op2, Register dst, int imm8);
   void emit_arith(int op1, int op2, Register dst, int32_t imm32);
   // only 32bit??
   void emit_arith(int op1, int op2, Register dst, jobject obj);
   void emit_arith(int op1, int op2, Register dst, Register src);
   void emit_operand(Register reg,
                     Register base, Register index, Address::ScaleFactor scale,
                     int disp,
                     RelocationHolder const& rspec,
                     int rip_relative_correction = 0);
   void emit_operand(Register reg, Address adr, int rip_relative_correction = 0);
   // operands that only take the original 32bit registers
   void emit_operand32(Register reg, Address adr);
   void emit_operand(XMMRegister reg,
                     Register base, Register index, Address::ScaleFactor scale,
                     int disp,
                     RelocationHolder const& rspec);
   void emit_operand(XMMRegister reg, Address adr);
   void emit_operand(MMXRegister reg, Address adr);
   // workaround gcc (3.2.1-7) bug
   void emit_operand(Address adr, MMXRegister reg);
   // Immediate-to-memory forms
   void emit_arith_operand(int op1, Register rm, Address adr, int32_t imm32);
   void emit_farith(int b1, int b2, int i);
  protected:
   #ifdef ASSERT
   void check_relocation(RelocationHolder const& rspec, int format);
   #endif
   inline void emit_long64(jlong x);
   void emit_data(jint data, relocInfo::relocType    rtype, int format);
   void emit_data(jint data, RelocationHolder const& rspec, int format);
   void emit_data64(jlong data, relocInfo::relocType rtype, int format = 0);
   void emit_data64(jlong data, RelocationHolder const& rspec, int format = 0);
   bool reachable(AddressLiteral adr) NOT_LP64({ return true;});
   // These are all easily abused and hence protected
   void mov_literal32(Register dst, int32_t imm32, RelocationHolder const& rspec, int format = 0);
   // 32BIT ONLY SECTION
 #ifndef _LP64
   // Make these disappear in 64bit mode since they would never be correct
   void cmp_literal32(Register src1, int32_t imm32, RelocationHolder const& rspec);   // 32BIT ONLY
   void cmp_literal32(Address src1, int32_t imm32, RelocationHolder const& rspec);    // 32BIT ONLY
   void mov_literal32(Address dst, int32_t imm32, RelocationHolder const& rspec);     // 32BIT ONLY
   void push_literal32(int32_t imm32, RelocationHolder const& rspec);                 // 32BIT ONLY
 #else
   // 64BIT ONLY SECTION
   void mov_literal64(Register dst, intptr_t imm64, RelocationHolder const& rspec);   // 64BIT ONLY
 #endif // _LP64
   // These are unique in that we are ensured by the caller that the 32bit
   // relative in these instructions will always be able to reach the potentially
   // 64bit address described by entry. Since they can take a 64bit address they
   // don't have the 32 suffix like the other instructions in this class.
   void call_literal(address entry, RelocationHolder const& rspec);
   void jmp_literal(address entry, RelocationHolder const& rspec);
   // Avoid using directly section
   // Instructions in this section are actually usable by anyone without danger
   // of failure but have performance issues that are addressed my enhanced
   // instructions which will do the proper thing base on the particular cpu.
   // We protect them because we don't trust you...
   // Don't use next inc() and dec() methods directly. INC & DEC instructions
   // could cause a partial flag stall since they don't set CF flag.
   // Use MacroAssembler::decrement() & MacroAssembler::increment() methods
   // which call inc() & dec() or add() & sub() in accordance with
   // the product flag UseIncDec value.
   void decl(Register dst);
   void decl(Address dst);
   void decq(Register dst);
   void decq(Address dst);
   void incl(Register dst);
   void incl(Address dst);
   void incq(Register dst);
   void incq(Address dst);
   // New cpus require use of movsd and movss to avoid partial register stall
   // when loading from memory. But for old Opteron use movlpd instead of movsd.
   // The selection is done in MacroAssembler::movdbl() and movflt().
   // Move Scalar Single-Precision Floating-Point Values
   void movss(XMMRegister dst, Address src);
   void movss(XMMRegister dst, XMMRegister src);
   void movss(Address dst, XMMRegister src);
   // Move Scalar Double-Precision Floating-Point Values
   void movsd(XMMRegister dst, Address src);
   void movsd(XMMRegister dst, XMMRegister src);
   void movsd(Address dst, XMMRegister src);
   void movlpd(XMMRegister dst, Address src);
   // New cpus require use of movaps and movapd to avoid partial register stall
   // when moving between registers.
   void movaps(XMMRegister dst, XMMRegister src);
   void movapd(XMMRegister dst, XMMRegister src);
   // End avoid using directly
   // Instruction prefixes
   void prefix(Prefix p);
   public:
   // Creation
   Assembler(CodeBuffer* code) : AbstractAssembler(code) {}
   // Decoding
   static address locate_operand(address inst, WhichOperand which);
   static address locate_next_instruction(address inst);
   // Utilities
 #ifdef _LP64
  static bool is_simm(int64_t x, int nbits) { return -( CONST64(1) << (nbits-1) )  <= x   &&   x  <  ( CONST64(1) << (nbits-1) ); }
  static bool is_simm32(int64_t x) { return x == (int64_t)(int32_t)x; }
 #else
  static bool is_simm(int32_t x, int nbits) { return -( 1 << (nbits-1) )  <= x   &&   x  <  ( 1 << (nbits-1) ); }
  static bool is_simm32(int32_t x) { return true; }
 #endif // LP64
   // Generic instructions
   // Does 32bit or 64bit as needed for the platform. In some sense these
   // belong in macro assembler but there is no need for both varieties to exist
   void lea(Register dst, Address src);
   void mov(Register dst, Register src);
   void pusha();
   void popa();
   void pushf();
   void popf();
   void push(int32_t imm32);
   void push(Register src);
   void pop(Register dst);
   // These are dummies to prevent surprise implicit conversions to Register
   void push(void* v);
   void pop(void* v);
   // These do register sized moves/scans
   void rep_mov();
   void rep_set();
   void repne_scan();
 #ifdef _LP64
   void repne_scanl();
 #endif
   // Vanilla instructions in lexical order
   void adcl(Register dst, int32_t imm32);
   void adcl(Register dst, Address src);
   void adcl(Register dst, Register src);
   void adcq(Register dst, int32_t imm32);
   void adcq(Register dst, Address src);
   void adcq(Register dst, Register src);
   void addl(Address dst, int32_t imm32);
   void addl(Address dst, Register src);
   void addl(Register dst, int32_t imm32);
   void addl(Register dst, Address src);
   void addl(Register dst, Register src);
   void addq(Address dst, int32_t imm32);
   void addq(Address dst, Register src);
   void addq(Register dst, int32_t imm32);
   void addq(Register dst, Address src);
   void addq(Register dst, Register src);
   void addr_nop_4();
   void addr_nop_5();
   void addr_nop_7();
   void addr_nop_8();
   // Add Scalar Double-Precision Floating-Point Values
   void addsd(XMMRegister dst, Address src);
   void addsd(XMMRegister dst, XMMRegister src);
   // Add Scalar Single-Precision Floating-Point Values
   void addss(XMMRegister dst, Address src);
   void addss(XMMRegister dst, XMMRegister src);
   void andl(Register dst, int32_t imm32);
   void andl(Register dst, Address src);
   void andl(Register dst, Register src);
   void andq(Register dst, int32_t imm32);
   void andq(Register dst, Address src);
   void andq(Register dst, Register src);
   // Bitwise Logical AND of Packed Double-Precision Floating-Point Values
   void andpd(XMMRegister dst, Address src);
   void andpd(XMMRegister dst, XMMRegister src);
   void bswapl(Register reg);
   void bswapq(Register reg);
   void call(Label& L, relocInfo::relocType rtype);
   void call(Register reg);  // push pc; pc <- reg
   void call(Address adr);   // push pc; pc <- adr
   void cdql();
   void cdqq();
   void cld() { emit_byte(0xfc); }
   void clflush(Address adr);
   void cmovl(Condition cc, Register dst, Register src);
   void cmovl(Condition cc, Register dst, Address src);
   void cmovq(Condition cc, Register dst, Register src);
   void cmovq(Condition cc, Register dst, Address src);
   void cmpb(Address dst, int imm8);
   void cmpl(Address dst, int32_t imm32);
   void cmpl(Register dst, int32_t imm32);
   void cmpl(Register dst, Register src);
   void cmpl(Register dst, Address src);
   void cmpq(Address dst, int32_t imm32);
   void cmpq(Address dst, Register src);
   void cmpq(Register dst, int32_t imm32);
   void cmpq(Register dst, Register src);
   void cmpq(Register dst, Address src);
   // these are dummies used to catch attempting to convert NULL to Register
   void cmpl(Register dst, void* junk); // dummy
   void cmpq(Register dst, void* junk); // dummy
   void cmpw(Address dst, int imm16);
   void cmpxchg8 (Address adr);
   void cmpxchgl(Register reg, Address adr);
   void cmpxchgq(Register reg, Address adr);
   // Ordered Compare Scalar Double-Precision Floating-Point Values and set EFLAGS
   void comisd(XMMRegister dst, Address src);
   // Ordered Compare Scalar Single-Precision Floating-Point Values and set EFLAGS
   void comiss(XMMRegister dst, Address src);
   // Identify processor type and features
   void cpuid() {
     emit_byte(0x0F);
     emit_byte(0xA2);
   }
   // Convert Scalar Double-Precision Floating-Point Value to Scalar Single-Precision Floating-Point Value
   void cvtsd2ss(XMMRegister dst, XMMRegister src);
   // Convert Doubleword Integer to Scalar Double-Precision Floating-Point Value
   void cvtsi2sdl(XMMRegister dst, Register src);
   void cvtsi2sdq(XMMRegister dst, Register src);
   // Convert Doubleword Integer to Scalar Single-Precision Floating-Point Value
   void cvtsi2ssl(XMMRegister dst, Register src);
   void cvtsi2ssq(XMMRegister dst, Register src);
   // Convert Packed Signed Doubleword Integers to Packed Double-Precision Floating-Point Value
   void cvtdq2pd(XMMRegister dst, XMMRegister src);
   // Convert Packed Signed Doubleword Integers to Packed Single-Precision Floating-Point Value
   void cvtdq2ps(XMMRegister dst, XMMRegister src);
   // Convert Scalar Single-Precision Floating-Point Value to Scalar Double-Precision Floating-Point Value
   void cvtss2sd(XMMRegister dst, XMMRegister src);
   // Convert with Truncation Scalar Double-Precision Floating-Point Value to Doubleword Integer
   void cvttsd2sil(Register dst, Address src);
   void cvttsd2sil(Register dst, XMMRegister src);
   void cvttsd2siq(Register dst, XMMRegister src);
   // Convert with Truncation Scalar Single-Precision Floating-Point Value to Doubleword Integer
   void cvttss2sil(Register dst, XMMRegister src);
   void cvttss2siq(Register dst, XMMRegister src);
   // Divide Scalar Double-Precision Floating-Point Values
   void divsd(XMMRegister dst, Address src);
   void divsd(XMMRegister dst, XMMRegister src);
   // Divide Scalar Single-Precision Floating-Point Values
   void divss(XMMRegister dst, Address src);
   void divss(XMMRegister dst, XMMRegister src);
   void emms();
   void fabs();
   void fadd(int i);
   void fadd_d(Address src);
   void fadd_s(Address src);
   // "Alternate" versions of x87 instructions place result down in FPU
   // stack instead of on TOS
   void fadda(int i); // "alternate" fadd
   void faddp(int i = 1);
   void fchs();
   void fcom(int i);
   void fcomp(int i = 1);
   void fcomp_d(Address src);
   void fcomp_s(Address src);
   void fcompp();
   void fcos();
   void fdecstp();
   void fdiv(int i);
   void fdiv_d(Address src);
   void fdivr_s(Address src);
   void fdiva(int i);  // "alternate" fdiv
   void fdivp(int i = 1);
   void fdivr(int i);
   void fdivr_d(Address src);
   void fdiv_s(Address src);
   void fdivra(int i); // "alternate" reversed fdiv
   void fdivrp(int i = 1);
   void ffree(int i = 0);
   void fild_d(Address adr);
   void fild_s(Address adr);
   void fincstp();
   void finit();
   void fist_s (Address adr);
   void fistp_d(Address adr);
   void fistp_s(Address adr);
   void fld1();
   void fld_d(Address adr);
   void fld_s(Address adr);
   void fld_s(int index);
   void fld_x(Address adr);  // extended-precision (80-bit) format
   void fldcw(Address src);
   void fldenv(Address src);
   void fldlg2();
   void fldln2();
   void fldz();
   void flog();
   void flog10();
   void fmul(int i);
   void fmul_d(Address src);
   void fmul_s(Address src);
   void fmula(int i);  // "alternate" fmul
   void fmulp(int i = 1);
   void fnsave(Address dst);
   void fnstcw(Address src);
   void fnstsw_ax();
   void fprem();
   void fprem1();
   void frstor(Address src);
   void fsin();
   void fsqrt();
   void fst_d(Address adr);
   void fst_s(Address adr);
   void fstp_d(Address adr);
   void fstp_d(int index);
   void fstp_s(Address adr);
   void fstp_x(Address adr); // extended-precision (80-bit) format
   void fsub(int i);
   void fsub_d(Address src);
   void fsub_s(Address src);
   void fsuba(int i);  // "alternate" fsub
   void fsubp(int i = 1);
   void fsubr(int i);
   void fsubr_d(Address src);
   void fsubr_s(Address src);
   void fsubra(int i); // "alternate" reversed fsub
   void fsubrp(int i = 1);
   void ftan();
   void ftst();
   void fucomi(int i = 1);
   void fucomip(int i = 1);
   void fwait();
   void fxch(int i = 1);
   void fxrstor(Address src);
   void fxsave(Address dst);
   void fyl2x();
   void hlt();
   void idivl(Register src);
   void idivq(Register src);
   void imull(Register dst, Register src);
   void imull(Register dst, Register src, int value);
   void imulq(Register dst, Register src);
   void imulq(Register dst, Register src, int value);
   // jcc is the generic conditional branch generator to run-
   // time routines, jcc is used for branches to labels. jcc
   // takes a branch opcode (cc) and a label (L) and generates
   // either a backward branch or a forward branch and links it
   // to the label fixup chain. Usage:
   //
   // Label L;      // unbound label
   // jcc(cc, L);   // forward branch to unbound label
   // bind(L);      // bind label to the current pc
   // jcc(cc, L);   // backward branch to bound label
   // bind(L);      // illegal: a label may be bound only once
   //
   // Note: The same Label can be used for forward and backward branches
   // but it may be bound only once.
   void jcc(Condition cc, Label& L,
            relocInfo::relocType rtype = relocInfo::none);
   // Conditional jump to a 8-bit offset to L.
   // WARNING: be very careful using this for forward jumps.  If the label is
   // not bound within an 8-bit offset of this instruction, a run-time error
   // will occur.
   void jccb(Condition cc, Label& L);
   void jmp(Address entry);    // pc <- entry
   // Label operations & relative jumps (PPUM Appendix D)
   void jmp(Label& L, relocInfo::relocType rtype = relocInfo::none);   // unconditional jump to L
   void jmp(Register entry); // pc <- entry
   // Unconditional 8-bit offset jump to L.
   // WARNING: be very careful using this for forward jumps.  If the label is
   // not bound within an 8-bit offset of this instruction, a run-time error
   // will occur.
   void jmpb(Label& L);
   void ldmxcsr( Address src );
   void leal(Register dst, Address src);
   void leaq(Register dst, Address src);
   void lfence() {
     emit_byte(0x0F);
     emit_byte(0xAE);
     emit_byte(0xE8);
   }
   void lock();
   enum Membar_mask_bits {
     StoreStore = 1 << 3,
     LoadStore  = 1 << 2,
     StoreLoad  = 1 << 1,
     LoadLoad   = 1 << 0
   };
   // Serializes memory.
   void membar(Membar_mask_bits order_constraint) {
     // We only have to handle StoreLoad and LoadLoad
     if (order_constraint & StoreLoad) {
       // MFENCE subsumes LFENCE
       mfence();
     } /* [jk] not needed currently: else if (order_constraint & LoadLoad) {
          lfence();
     } */
   }
   void mfence();
   // Moves
   void mov64(Register dst, int64_t imm64);
   void movb(Address dst, Register src);
   void movb(Address dst, int imm8);
   void movb(Register dst, Address src);
   void movdl(XMMRegister dst, Register src);
   void movdl(Register dst, XMMRegister src);
   // Move Double Quadword
   void movdq(XMMRegister dst, Register src);
   void movdq(Register dst, XMMRegister src);
   // Move Aligned Double Quadword
   void movdqa(Address     dst, XMMRegister src);
   void movdqa(XMMRegister dst, Address src);
   void movdqa(XMMRegister dst, XMMRegister src);
   // Move Unaligned Double Quadword
   void movdqu(Address     dst, XMMRegister src);
   void movdqu(XMMRegister dst, Address src);
   void movdqu(XMMRegister dst, XMMRegister src);
   void movl(Register dst, int32_t imm32);
   void movl(Address dst, int32_t imm32);
   void movl(Register dst, Register src);
   void movl(Register dst, Address src);
   void movl(Address dst, Register src);
   // These dummies prevent using movl from converting a zero (like NULL) into Register
   // by giving the compiler two choices it can't resolve
   void movl(Address  dst, void* junk);
   void movl(Register dst, void* junk);
 #ifdef _LP64
   void movq(Register dst, Register src);
   void movq(Register dst, Address src);
   void movq(Address dst, Register src);
 #endif
   void movq(Address     dst, MMXRegister src );
   void movq(MMXRegister dst, Address src );
 #ifdef _LP64
   // These dummies prevent using movq from converting a zero (like NULL) into Register
   // by giving the compiler two choices it can't resolve
   void movq(Address  dst, void* dummy);
   void movq(Register dst, void* dummy);
 #endif
   // Move Quadword
   void movq(Address     dst, XMMRegister src);
   void movq(XMMRegister dst, Address src);
   void movsbl(Register dst, Address src);
   void movsbl(Register dst, Register src);
 #ifdef _LP64
   void movsbq(Register dst, Address src);
   void movsbq(Register dst, Register src);
   // Move signed 32bit immediate to 64bit extending sign
   void movslq(Address dst, int32_t imm64);
   void movslq(Register dst, int32_t imm64);
   void movslq(Register dst, Address src);
   void movslq(Register dst, Register src);
   void movslq(Register dst, void* src); // Dummy declaration to cause NULL to be ambiguous
 #endif
   void movswl(Register dst, Address src);
   void movswl(Register dst, Register src);
 #ifdef _LP64
   void movswq(Register dst, Address src);
   void movswq(Register dst, Register src);
 #endif
   void movw(Address dst, int imm16);
   void movw(Register dst, Address src);
   void movw(Address dst, Register src);
   void movzbl(Register dst, Address src);
   void movzbl(Register dst, Register src);
 #ifdef _LP64
   void movzbq(Register dst, Address src);
   void movzbq(Register dst, Register src);
 #endif
   void movzwl(Register dst, Address src);
   void movzwl(Register dst, Register src);
 #ifdef _LP64
   void movzwq(Register dst, Address src);
   void movzwq(Register dst, Register src);
 #endif
   void mull(Address src);
   void mull(Register src);
   // Multiply Scalar Double-Precision Floating-Point Values
   void mulsd(XMMRegister dst, Address src);
   void mulsd(XMMRegister dst, XMMRegister src);
   // Multiply Scalar Single-Precision Floating-Point Values
   void mulss(XMMRegister dst, Address src);
   void mulss(XMMRegister dst, XMMRegister src);
   void negl(Register dst);
 #ifdef _LP64
   void negq(Register dst);
 #endif
   void nop(int i = 1);
   void notl(Register dst);
 #ifdef _LP64
   void notq(Register dst);
 #endif
   void orl(Address dst, int32_t imm32);
   void orl(Register dst, int32_t imm32);
   void orl(Register dst, Address src);
   void orl(Register dst, Register src);
   void orq(Address dst, int32_t imm32);
   void orq(Register dst, int32_t imm32);
   void orq(Register dst, Address src);
   void orq(Register dst, Register src);
   void popl(Address dst);
 #ifdef _LP64
   void popq(Address dst);
 #endif
   // Prefetches (SSE, SSE2, 3DNOW only)
   void prefetchnta(Address src);
   void prefetchr(Address src);
   void prefetcht0(Address src);
   void prefetcht1(Address src);
   void prefetcht2(Address src);
   void prefetchw(Address src);
   // Shuffle Packed Doublewords
   void pshufd(XMMRegister dst, XMMRegister src, int mode);
   void pshufd(XMMRegister dst, Address src,     int mode);
   // Shuffle Packed Low Words
   void pshuflw(XMMRegister dst, XMMRegister src, int mode);
   void pshuflw(XMMRegister dst, Address src,     int mode);
   // Shift Right Logical Quadword Immediate
   void psrlq(XMMRegister dst, int shift);
   // Interleave Low Bytes
   void punpcklbw(XMMRegister dst, XMMRegister src);
   void pushl(Address src);
   void pushq(Address src);
   // Xor Packed Byte Integer Values
   void pxor(XMMRegister dst, Address src);
   void pxor(XMMRegister dst, XMMRegister src);
   void rcll(Register dst, int imm8);
   void rclq(Register dst, int imm8);
   void ret(int imm16);
   void sahf();
   void sarl(Register dst, int imm8);
   void sarl(Register dst);
   void sarq(Register dst, int imm8);
   void sarq(Register dst);
   void sbbl(Address dst, int32_t imm32);
   void sbbl(Register dst, int32_t imm32);
   void sbbl(Register dst, Address src);
   void sbbl(Register dst, Register src);
   void sbbq(Address dst, int32_t imm32);
   void sbbq(Register dst, int32_t imm32);
   void sbbq(Register dst, Address src);
   void sbbq(Register dst, Register src);
   void setb(Condition cc, Register dst);
   void shldl(Register dst, Register src);
   void shll(Register dst, int imm8);
   void shll(Register dst);
   void shlq(Register dst, int imm8);
   void shlq(Register dst);
   void shrdl(Register dst, Register src);
   void shrl(Register dst, int imm8);
   void shrl(Register dst);
   void shrq(Register dst, int imm8);
   void shrq(Register dst);
   void smovl(); // QQQ generic?
   // Compute Square Root of Scalar Double-Precision Floating-Point Value
   void sqrtsd(XMMRegister dst, Address src);
   void sqrtsd(XMMRegister dst, XMMRegister src);
   void std() { emit_byte(0xfd); }
   void stmxcsr( Address dst );
   void subl(Address dst, int32_t imm32);
   void subl(Address dst, Register src);
   void subl(Register dst, int32_t imm32);
   void subl(Register dst, Address src);
   void subl(Register dst, Register src);
   void subq(Address dst, int32_t imm32);
   void subq(Address dst, Register src);
   void subq(Register dst, int32_t imm32);
   void subq(Register dst, Address src);
   void subq(Register dst, Register src);
   // Subtract Scalar Double-Precision Floating-Point Values
   void subsd(XMMRegister dst, Address src);
   void subsd(XMMRegister dst, XMMRegister src);
   // Subtract Scalar Single-Precision Floating-Point Values
   void subss(XMMRegister dst, Address src);
   void subss(XMMRegister dst, XMMRegister src);
   void testb(Register dst, int imm8);
   void testl(Register dst, int32_t imm32);
   void testl(Register dst, Register src);
   void testl(Register dst, Address src);
   void testq(Register dst, int32_t imm32);
   void testq(Register dst, Register src);
   // Unordered Compare Scalar Double-Precision Floating-Point Values and set EFLAGS
   void ucomisd(XMMRegister dst, Address src);
   void ucomisd(XMMRegister dst, XMMRegister src);
   // Unordered Compare Scalar Single-Precision Floating-Point Values and set EFLAGS
   void ucomiss(XMMRegister dst, Address src);
   void ucomiss(XMMRegister dst, XMMRegister src);
   void xaddl(Address dst, Register src);
   void xaddq(Address dst, Register src);
   void xchgl(Register reg, Address adr);
   void xchgl(Register dst, Register src);
   void xchgq(Register reg, Address adr);
   void xchgq(Register dst, Register src);
   void xorl(Register dst, int32_t imm32);
   void xorl(Register dst, Address src);
   void xorl(Register dst, Register src);
   void xorq(Register dst, Address src);
   void xorq(Register dst, Register src);
   // Bitwise Logical XOR of Packed Double-Precision Floating-Point Values
   void xorpd(XMMRegister dst, Address src);
   void xorpd(XMMRegister dst, XMMRegister src);
   // Bitwise Logical XOR of Packed Single-Precision Floating-Point Values
   void xorps(XMMRegister dst, Address src);
   void xorps(XMMRegister dst, XMMRegister src);
   void set_byte_if_not_zero(Register dst); // sets reg to 1 if not zero, otherwise 0
 };
 // MacroAssembler extends Assembler by frequently used macros.
 //
 // Instructions for which a 'better' code sequence exists depending
 // on arguments should also go in here.
 class MacroAssembler: public Assembler {
   friend class LIR_Assembler;
   friend class Runtime1;      // as_Address()
  protected:
   Address as_Address(AddressLiteral adr);
   Address as_Address(ArrayAddress adr);
   // Support for VM calls
   //
   // This is the base routine called by the different versions of call_VM_leaf. The interpreter
   // may customize this version by overriding it for its purposes (e.g., to save/restore
   // additional registers when doing a VM call).
 #ifdef CC_INTERP
   // c++ interpreter never wants to use interp_masm version of call_VM
   #define VIRTUAL
 #else
   #define VIRTUAL virtual
 #endif
   VIRTUAL void call_VM_leaf_base(
     address entry_point,               // the entry point
     int     number_of_arguments        // the number of arguments to pop after the call
   );
   // This is the base routine called by the different versions of call_VM. The interpreter
   // may customize this version by overriding it for its purposes (e.g., to save/restore
   // additional registers when doing a VM call).
   //
   // If no java_thread register is specified (noreg) than rdi will be used instead. call_VM_base
   // returns the register which contains the thread upon return. If a thread register has been
   // specified, the return value will correspond to that register. If no last_java_sp is specified
   // (noreg) than rsp will be used instead.
   VIRTUAL void call_VM_base(           // returns the register containing the thread upon return
     Register oop_result,               // where an oop-result ends up if any; use noreg otherwise
     Register java_thread,              // the thread if computed before     ; use noreg otherwise
     Register last_java_sp,             // to set up last_Java_frame in stubs; use noreg otherwise
     address  entry_point,              // the entry point
     int      number_of_arguments,      // the number of arguments (w/o thread) to pop after the call
     bool     check_exceptions          // whether to check for pending exceptions after return
   );
   // These routines should emit JVMTI PopFrame and ForceEarlyReturn handling code.
   // The implementation is only non-empty for the InterpreterMacroAssembler,
   // as only the interpreter handles PopFrame and ForceEarlyReturn requests.
   virtual void check_and_handle_popframe(Register java_thread);
   virtual void check_and_handle_earlyret(Register java_thread);
   void call_VM_helper(Register oop_result, address entry_point, int number_of_arguments, bool check_exceptions = true);
   // helpers for FPU flag access
   // tmp is a temporary register, if none is available use noreg
   void save_rax   (Register tmp);
   void restore_rax(Register tmp);
  public:
   MacroAssembler(CodeBuffer* code) : Assembler(code) {}
   // Support for NULL-checks
   //
   // Generates code that causes a NULL OS exception if the content of reg is NULL.
   // If the accessed location is M[reg + offset] and the offset is known, provide the
   // offset. No explicit code generation is needed if the offset is within a certain
   // range (0 <= offset <= page_size).
   void null_check(Register reg, int offset = -1);
   static bool needs_explicit_null_check(intptr_t offset);
   // Required platform-specific helpers for Label::patch_instructions.
   // They _shadow_ the declarations in AbstractAssembler, which are undefined.
   void pd_patch_instruction(address branch, address target);
 #ifndef PRODUCT
   static void pd_print_patched_instruction(address branch);
 #endif
   // The following 4 methods return the offset of the appropriate move instruction
   // Support for fast byte/short loading with zero extension (depending on particular CPU)
   int load_unsigned_byte(Register dst, Address src);
   int load_unsigned_short(Register dst, Address src);
   // Support for fast byte/short loading with sign extension (depending on particular CPU)
   int load_signed_byte(Register dst, Address src);
   int load_signed_short(Register dst, Address src);
   // Support for sign-extension (hi:lo = extend_sign(lo))
   void extend_sign(Register hi, Register lo);
   // Loading values by size and signed-ness
   void load_sized_value(Register dst, Address src, int size_in_bytes, bool is_signed);
   // Support for inc/dec with optimal instruction selection depending on value
   void increment(Register reg, int value = 1) { LP64_ONLY(incrementq(reg, value)) NOT_LP64(incrementl(reg, value)) ; }
   void decrement(Register reg, int value = 1) { LP64_ONLY(decrementq(reg, value)) NOT_LP64(decrementl(reg, value)) ; }
   void decrementl(Address dst, int value = 1);
   void decrementl(Register reg, int value = 1);
   void decrementq(Register reg, int value = 1);
   void decrementq(Address dst, int value = 1);
   void incrementl(Address dst, int value = 1);
   void incrementl(Register reg, int value = 1);
   void incrementq(Register reg, int value = 1);
   void incrementq(Address dst, int value = 1);
   // Support optimal SSE move instructions.
   void movflt(XMMRegister dst, XMMRegister src) {
     if (UseXmmRegToRegMoveAll) { movaps(dst, src); return; }
     else                       { movss (dst, src); return; }
   }
   void movflt(XMMRegister dst, Address src) { movss(dst, src); }
   void movflt(XMMRegister dst, AddressLiteral src);
   void movflt(Address dst, XMMRegister src) { movss(dst, src); }
   void movdbl(XMMRegister dst, XMMRegister src) {
     if (UseXmmRegToRegMoveAll) { movapd(dst, src); return; }
     else                       { movsd (dst, src); return; }
   }
   void movdbl(XMMRegister dst, AddressLiteral src);
   void movdbl(XMMRegister dst, Address src) {
     if (UseXmmLoadAndClearUpper) { movsd (dst, src); return; }
     else                         { movlpd(dst, src); return; }
   }
   void movdbl(Address dst, XMMRegister src) { movsd(dst, src); }
   void incrementl(AddressLiteral dst);
   void incrementl(ArrayAddress dst);
   // Alignment
   void align(int modulus);
   // Misc
   void fat_nop(); // 5 byte nop
   // Stack frame creation/removal
   void enter();
   void leave();
   // Support for getting the JavaThread pointer (i.e.; a reference to thread-local information)
   // The pointer will be loaded into the thread register.
   void get_thread(Register thread);
   // Support for VM calls
   //
   // It is imperative that all calls into the VM are handled via the call_VM macros.
   // They make sure that the stack linkage is setup correctly. call_VM's correspond
   // to ENTRY/ENTRY_X entry points while call_VM_leaf's correspond to LEAF entry points.
   void call_VM(Register oop_result,
                address entry_point,
                bool check_exceptions = true);
   void call_VM(Register oop_result,
                address entry_point,
                Register arg_1,
                bool check_exceptions = true);
   void call_VM(Register oop_result,
                address entry_point,
                Register arg_1, Register arg_2,
                bool check_exceptions = true);
   void call_VM(Register oop_result,
                address entry_point,
                Register arg_1, Register arg_2, Register arg_3,
                bool check_exceptions = true);
   // Overloadings with last_Java_sp
   void call_VM(Register oop_result,
                Register last_java_sp,
                address entry_point,
                int number_of_arguments = 0,
                bool check_exceptions = true);
   void call_VM(Register oop_result,
                Register last_java_sp,
                address entry_point,
                Register arg_1, bool
                check_exceptions = true);
   void call_VM(Register oop_result,
                Register last_java_sp,
                address entry_point,
                Register arg_1, Register arg_2,
                bool check_exceptions = true);
   void call_VM(Register oop_result,
                Register last_java_sp,
                address entry_point,
                Register arg_1, Register arg_2, Register arg_3,
                bool check_exceptions = true);
   void call_VM_leaf(address entry_point,
                     int number_of_arguments = 0);
   void call_VM_leaf(address entry_point,
                     Register arg_1);
   void call_VM_leaf(address entry_point,
                     Register arg_1, Register arg_2);
   void call_VM_leaf(address entry_point,
                     Register arg_1, Register arg_2, Register arg_3);
   // last Java Frame (fills frame anchor)
   void set_last_Java_frame(Register thread,
                            Register last_java_sp,
                            Register last_java_fp,
                            address last_java_pc);
   // thread in the default location (r15_thread on 64bit)
   void set_last_Java_frame(Register last_java_sp,
                            Register last_java_fp,
                            address last_java_pc);
   void reset_last_Java_frame(Register thread, bool clear_fp, bool clear_pc);
   // thread in the default location (r15_thread on 64bit)
   void reset_last_Java_frame(bool clear_fp, bool clear_pc);
   // Stores
   void store_check(Register obj);                // store check for obj - register is destroyed afterwards
   void store_check(Register obj, Address dst);   // same as above, dst is exact store location (reg. is destroyed)
   void g1_write_barrier_pre(Register obj,
 #ifndef _LP64
                             Register thread,
 #endif
                             Register tmp,
                             Register tmp2,
                             bool     tosca_live);
   void g1_write_barrier_post(Register store_addr,
                              Register new_val,
 #ifndef _LP64
                              Register thread,
 #endif
                              Register tmp,
                              Register tmp2);
   // split store_check(Register obj) to enhance instruction interleaving
   void store_check_part_1(Register obj);
   void store_check_part_2(Register obj);
   // C 'boolean' to Java boolean: x == 0 ? 0 : 1
   void c2bool(Register x);
   // C++ bool manipulation
   void movbool(Register dst, Address src);
   void movbool(Address dst, bool boolconst);
   void movbool(Address dst, Register src);
   void testbool(Register dst);
   // oop manipulations
   void load_klass(Register dst, Register src);
   void store_klass(Register dst, Register src);
   void load_prototype_header(Register dst, Register src);
 #ifdef _LP64
   void store_klass_gap(Register dst, Register src);
   void load_heap_oop(Register dst, Address src);
   void store_heap_oop(Address dst, Register src);
   void encode_heap_oop(Register r);
   void decode_heap_oop(Register r);
   void encode_heap_oop_not_null(Register r);
   void decode_heap_oop_not_null(Register r);
   void encode_heap_oop_not_null(Register dst, Register src);
   void decode_heap_oop_not_null(Register dst, Register src);
   void set_narrow_oop(Register dst, jobject obj);
   // if heap base register is used - reinit it with the correct value
   void reinit_heapbase();
 #endif // _LP64
   // Int division/remainder for Java
   // (as idivl, but checks for special case as described in JVM spec.)
   // returns idivl instruction offset for implicit exception handling
   int corrected_idivl(Register reg);
   // Long division/remainder for Java
   // (as idivq, but checks for special case as described in JVM spec.)
   // returns idivq instruction offset for implicit exception handling
   int corrected_idivq(Register reg);
   void int3();
   // Long operation macros for a 32bit cpu
   // Long negation for Java
   void lneg(Register hi, Register lo);
   // Long multiplication for Java
   // (destroys contents of eax, ebx, ecx and edx)
   void lmul(int x_rsp_offset, int y_rsp_offset); // rdx:rax = x * y
   // Long shifts for Java
   // (semantics as described in JVM spec.)
   void lshl(Register hi, Register lo);                               // hi:lo << (rcx & 0x3f)
   void lshr(Register hi, Register lo, bool sign_extension = false);  // hi:lo >> (rcx & 0x3f)
   // Long compare for Java
   // (semantics as described in JVM spec.)
   void lcmp2int(Register x_hi, Register x_lo, Register y_hi, Register y_lo); // x_hi = lcmp(x, y)
   // misc
   // Sign extension
   void sign_extend_short(Register reg);
   void sign_extend_byte(Register reg);
   // Division by power of 2, rounding towards 0
   void division_with_shift(Register reg, int shift_value);
   // Compares the top-most stack entries on the FPU stack and sets the eflags as follows:
   //
   // CF (corresponds to C0) if x < y
   // PF (corresponds to C2) if unordered
   // ZF (corresponds to C3) if x = y
   //
   // The arguments are in reversed order on the stack (i.e., top of stack is first argument).
   // tmp is a temporary register, if none is available use noreg (only matters for non-P6 code)
   void fcmp(Register tmp);
   // Variant of the above which allows y to be further down the stack
   // and which only pops x and y if specified. If pop_right is
   // specified then pop_left must also be specified.
   void fcmp(Register tmp, int index, bool pop_left, bool pop_right);
   // Floating-point comparison for Java
   // Compares the top-most stack entries on the FPU stack and stores the result in dst.
   // The arguments are in reversed order on the stack (i.e., top of stack is first argument).
   // (semantics as described in JVM spec.)
   void fcmp2int(Register dst, bool unordered_is_less);
   // Variant of the above which allows y to be further down the stack
   // and which only pops x and y if specified. If pop_right is
   // specified then pop_left must also be specified.
   void fcmp2int(Register dst, bool unordered_is_less, int index, bool pop_left, bool pop_right);
   // Floating-point remainder for Java (ST0 = ST0 fremr ST1, ST1 is empty afterwards)
   // tmp is a temporary register, if none is available use noreg
   void fremr(Register tmp);
   // same as fcmp2int, but using SSE2
   void cmpss2int(XMMRegister opr1, XMMRegister opr2, Register dst, bool unordered_is_less);
   void cmpsd2int(XMMRegister opr1, XMMRegister opr2, Register dst, bool unordered_is_less);
   // Inlined sin/cos generator for Java; must not use CPU instruction
   // directly on Intel as it does not have high enough precision
   // outside of the range [-pi/4, pi/4]. Extra argument indicate the
   // number of FPU stack slots in use; all but the topmost will
   // require saving if a slow case is necessary. Assumes argument is
   // on FP TOS; result is on FP TOS.  No cpu registers are changed by
   // this code.
   void trigfunc(char trig, int num_fpu_regs_in_use = 1);
   // branch to L if FPU flag C2 is set/not set
   // tmp is a temporary register, if none is available use noreg
   void jC2 (Register tmp, Label& L);
   void jnC2(Register tmp, Label& L);
   // Pop ST (ffree & fincstp combined)
   void fpop();
   // pushes double TOS element of FPU stack on CPU stack; pops from FPU stack
   void push_fTOS();
   // pops double TOS element from CPU stack and pushes on FPU stack
   void pop_fTOS();
   void empty_FPU_stack();
   void push_IU_state();
   void pop_IU_state();
   void push_FPU_state();
   void pop_FPU_state();
   void push_CPU_state();
   void pop_CPU_state();
   // Round up to a power of two
   void round_to(Register reg, int modulus);
   // Callee saved registers handling
   void push_callee_saved_registers();
   void pop_callee_saved_registers();
   // allocation
   void eden_allocate(
     Register obj,                      // result: pointer to object after successful allocation
     Register var_size_in_bytes,        // object size in bytes if unknown at compile time; invalid otherwise
     int      con_size_in_bytes,        // object size in bytes if   known at compile time
     Register t1,                       // temp register
     Label&   slow_case                 // continuation point if fast allocation fails
   );
   void tlab_allocate(
     Register obj,                      // result: pointer to object after successful allocation
     Register var_size_in_bytes,        // object size in bytes if unknown at compile time; invalid otherwise
     int      con_size_in_bytes,        // object size in bytes if   known at compile time
     Register t1,                       // temp register
     Register t2,                       // temp register
     Label&   slow_case                 // continuation point if fast allocation fails
   );
   void tlab_refill(Label& retry_tlab, Label& try_eden, Label& slow_case);
   // interface method calling
   void lookup_interface_method(Register recv_klass,
                                Register intf_klass,
                                RegisterConstant itable_index,
                                Register method_result,
                                Register scan_temp,
                                Label& no_such_interface);
   //----
   void set_word_if_not_zero(Register reg); // sets reg to 1 if not zero, otherwise 0
   // Debugging
   // only if +VerifyOops
   void verify_oop(Register reg, const char* s = "broken oop");
   void verify_oop_addr(Address addr, const char * s = "broken oop addr");
   // only if +VerifyFPU
   void verify_FPU(int stack_depth, const char* s = "illegal FPU state");
   // prints msg, dumps registers and stops execution
   void stop(const char* msg);
   // prints msg and continues
   void warn(const char* msg);
   static void debug32(int rdi, int rsi, int rbp, int rsp, int rbx, int rdx, int rcx, int rax, int eip, char* msg);
   static void debug64(char* msg, int64_t pc, int64_t regs[]);
   void os_breakpoint();
   void untested()                                { stop("untested"); }
   void unimplemented(const char* what = "")      { char* b = new char[1024];  jio_snprintf(b, sizeof(b), "unimplemented: %s", what);  stop(b); }
   void should_not_reach_here()                   { stop("should not reach here"); }
   void print_CPU_state();
   // Stack overflow checking
   void bang_stack_with_offset(int offset) {
     // stack grows down, caller passes positive offset
     assert(offset > 0, "must bang with negative offset");
     movl(Address(rsp, (-offset)), rax);
   }
   // Writes to stack successive pages until offset reached to check for
   // stack overflow + shadow pages.  Also, clobbers tmp
   void bang_stack_size(Register size, Register tmp);
   virtual RegisterConstant delayed_value(intptr_t* delayed_value_addr,
                                          Register tmp,
                                          int offset);
   // Support for serializing memory accesses between threads
   void serialize_memory(Register thread, Register tmp);
   void verify_tlab();
   // Biased locking support
   // lock_reg and obj_reg must be loaded up with the appropriate values.
   // swap_reg must be rax, and is killed.
   // tmp_reg is optional. If it is supplied (i.e., != noreg) it will
   // be killed; if not supplied, push/pop will be used internally to
   // allocate a temporary (inefficient, avoid if possible).
   // Optional slow case is for implementations (interpreter and C1) which branch to
   // slow case directly. Leaves condition codes set for C2's Fast_Lock node.
   // Returns offset of first potentially-faulting instruction for null
   // check info (currently consumed only by C1). If
   // swap_reg_contains_mark is true then returns -1 as it is assumed
   // the calling code has already passed any potential faults.
   int biased_locking_enter(Register lock_reg, Register obj_reg,
                            Register swap_reg, Register tmp_reg,
                            bool swap_reg_contains_mark,
                            Label& done, Label* slow_case = NULL,
                            BiasedLockingCounters* counters = NULL);
   void biased_locking_exit (Register obj_reg, Register temp_reg, Label& done);
   Condition negate_condition(Condition cond);
   // Instructions that use AddressLiteral operands. These instruction can handle 32bit/64bit
   // operands. In general the names are modified to avoid hiding the instruction in Assembler
   // so that we don't need to implement all the varieties in the Assembler with trivial wrappers
   // here in MacroAssembler. The major exception to this rule is call
   // Arithmetics
   void addptr(Address dst, int32_t src) { LP64_ONLY(addq(dst, src)) NOT_LP64(addl(dst, src)) ; }
   void addptr(Address dst, Register src);
   void addptr(Register dst, Address src) { LP64_ONLY(addq(dst, src)) NOT_LP64(addl(dst, src)); }
   void addptr(Register dst, int32_t src);
   void addptr(Register dst, Register src);
   void andptr(Register dst, int32_t src);
   void andptr(Register src1, Register src2) { LP64_ONLY(andq(src1, src2)) NOT_LP64(andl(src1, src2)) ; }
   void cmp8(AddressLiteral src1, int imm);
   // renamed to drag out the casting of address to int32_t/intptr_t
   void cmp32(Register src1, int32_t imm);
   void cmp32(AddressLiteral src1, int32_t imm);
   // compare reg - mem, or reg - &mem
   void cmp32(Register src1, AddressLiteral src2);
   void cmp32(Register src1, Address src2);
 #ifndef _LP64
   void cmpoop(Address dst, jobject obj);
   void cmpoop(Register dst, jobject obj);
 #endif // _LP64
   // NOTE src2 must be the lval. This is NOT an mem-mem compare
   void cmpptr(Address src1, AddressLiteral src2);
   void cmpptr(Register src1, AddressLiteral src2);
   void cmpptr(Register src1, Register src2) { LP64_ONLY(cmpq(src1, src2)) NOT_LP64(cmpl(src1, src2)) ; }
   void cmpptr(Register src1, Address src2) { LP64_ONLY(cmpq(src1, src2)) NOT_LP64(cmpl(src1, src2)) ; }
   // void cmpptr(Address src1, Register src2) { LP64_ONLY(cmpq(src1, src2)) NOT_LP64(cmpl(src1, src2)) ; }
   void cmpptr(Register src1, int32_t src2) { LP64_ONLY(cmpq(src1, src2)) NOT_LP64(cmpl(src1, src2)) ; }
   void cmpptr(Address src1, int32_t src2) { LP64_ONLY(cmpq(src1, src2)) NOT_LP64(cmpl(src1, src2)) ; }
   // cmp64 to avoild hiding cmpq
   void cmp64(Register src1, AddressLiteral src);
   void cmpxchgptr(Register reg, Address adr);
   void locked_cmpxchgptr(Register reg, AddressLiteral adr);
   void imulptr(Register dst, Register src) { LP64_ONLY(imulq(dst, src)) NOT_LP64(imull(dst, src)); }
   void negptr(Register dst) { LP64_ONLY(negq(dst)) NOT_LP64(negl(dst)); }
   void notptr(Register dst) { LP64_ONLY(notq(dst)) NOT_LP64(notl(dst)); }
   void shlptr(Register dst, int32_t shift);
   void shlptr(Register dst) { LP64_ONLY(shlq(dst)) NOT_LP64(shll(dst)); }
   void shrptr(Register dst, int32_t shift);
   void shrptr(Register dst) { LP64_ONLY(shrq(dst)) NOT_LP64(shrl(dst)); }
   void sarptr(Register dst) { LP64_ONLY(sarq(dst)) NOT_LP64(sarl(dst)); }
   void sarptr(Register dst, int32_t src) { LP64_ONLY(sarq(dst, src)) NOT_LP64(sarl(dst, src)); }
   void subptr(Address dst, int32_t src) { LP64_ONLY(subq(dst, src)) NOT_LP64(subl(dst, src)); }
   void subptr(Register dst, Address src) { LP64_ONLY(subq(dst, src)) NOT_LP64(subl(dst, src)); }
   void subptr(Register dst, int32_t src);
   void subptr(Register dst, Register src);
   void sbbptr(Address dst, int32_t src) { LP64_ONLY(sbbq(dst, src)) NOT_LP64(sbbl(dst, src)); }
   void sbbptr(Register dst, int32_t src) { LP64_ONLY(sbbq(dst, src)) NOT_LP64(sbbl(dst, src)); }
   void xchgptr(Register src1, Register src2) { LP64_ONLY(xchgq(src1, src2)) NOT_LP64(xchgl(src1, src2)) ; }
   void xchgptr(Register src1, Address src2) { LP64_ONLY(xchgq(src1, src2)) NOT_LP64(xchgl(src1, src2)) ; }
   void xaddptr(Address src1, Register src2) { LP64_ONLY(xaddq(src1, src2)) NOT_LP64(xaddl(src1, src2)) ; }
   // Helper functions for statistics gathering.
   // Conditionally (atomically, on MPs) increments passed counter address, preserving condition codes.
   void cond_inc32(Condition cond, AddressLiteral counter_addr);
   // Unconditional atomic increment.
   void atomic_incl(AddressLiteral counter_addr);
   void lea(Register dst, AddressLiteral adr);
   void lea(Address dst, AddressLiteral adr);
   void lea(Register dst, Address adr) { Assembler::lea(dst, adr); }
   void leal32(Register dst, Address src) { leal(dst, src); }
   void test32(Register src1, AddressLiteral src2);
   void orptr(Register dst, Address src) { LP64_ONLY(orq(dst, src)) NOT_LP64(orl(dst, src)); }
   void orptr(Register dst, Register src) { LP64_ONLY(orq(dst, src)) NOT_LP64(orl(dst, src)); }
   void orptr(Register dst, int32_t src) { LP64_ONLY(orq(dst, src)) NOT_LP64(orl(dst, src)); }
   void testptr(Register src, int32_t imm32) {  LP64_ONLY(testq(src, imm32)) NOT_LP64(testl(src, imm32)); }
   void testptr(Register src1, Register src2);
   void xorptr(Register dst, Register src) { LP64_ONLY(xorq(dst, src)) NOT_LP64(xorl(dst, src)); }
   void xorptr(Register dst, Address src) { LP64_ONLY(xorq(dst, src)) NOT_LP64(xorl(dst, src)); }
   // Calls
   void call(Label& L, relocInfo::relocType rtype);
   void call(Register entry);
   // NOTE: this call tranfers to the effective address of entry NOT
   // the address contained by entry. This is because this is more natural
   // for jumps/calls.
   void call(AddressLiteral entry);
   // Jumps
   // NOTE: these jumps tranfer to the effective address of dst NOT
   // the address contained by dst. This is because this is more natural
   // for jumps/calls.
   void jump(AddressLiteral dst);
   void jump_cc(Condition cc, AddressLiteral dst);
   // 32bit can do a case table jump in one instruction but we no longer allow the base
   // to be installed in the Address class. This jump will tranfers to the address
   // contained in the location described by entry (not the address of entry)
   void jump(ArrayAddress entry);
   // Floating
   void andpd(XMMRegister dst, Address src) { Assembler::andpd(dst, src); }
   void andpd(XMMRegister dst, AddressLiteral src);
   void comiss(XMMRegister dst, Address src) { Assembler::comiss(dst, src); }
   void comiss(XMMRegister dst, AddressLiteral src);
   void comisd(XMMRegister dst, Address src) { Assembler::comisd(dst, src); }
   void comisd(XMMRegister dst, AddressLiteral src);
   void fldcw(Address src) { Assembler::fldcw(src); }
   void fldcw(AddressLiteral src);
   void fld_s(int index)   { Assembler::fld_s(index); }
   void fld_s(Address src) { Assembler::fld_s(src); }
   void fld_s(AddressLiteral src);
   void fld_d(Address src) { Assembler::fld_d(src); }
   void fld_d(AddressLiteral src);
   void fld_x(Address src) { Assembler::fld_x(src); }
   void fld_x(AddressLiteral src);
   void ldmxcsr(Address src) { Assembler::ldmxcsr(src); }
   void ldmxcsr(AddressLiteral src);
 private:
   // these are private because users should be doing movflt/movdbl
   void movss(Address dst, XMMRegister src)     { Assembler::movss(dst, src); }
   void movss(XMMRegister dst, XMMRegister src) { Assembler::movss(dst, src); }
   void movss(XMMRegister dst, Address src)     { Assembler::movss(dst, src); }
   void movss(XMMRegister dst, AddressLiteral src);
   void movlpd(XMMRegister dst, Address src)      {Assembler::movlpd(dst, src); }
   void movlpd(XMMRegister dst, AddressLiteral src);
 public:
   void movsd(XMMRegister dst, XMMRegister src) { Assembler::movsd(dst, src); }
   void movsd(Address dst, XMMRegister src)     { Assembler::movsd(dst, src); }
   void movsd(XMMRegister dst, Address src)     { Assembler::movsd(dst, src); }
   void movsd(XMMRegister dst, AddressLiteral src);
   void ucomiss(XMMRegister dst, XMMRegister src) { Assembler::ucomiss(dst, src); }
   void ucomiss(XMMRegister dst, Address src) { Assembler::ucomiss(dst, src); }
   void ucomiss(XMMRegister dst, AddressLiteral src);
   void ucomisd(XMMRegister dst, XMMRegister src) { Assembler::ucomisd(dst, src); }
   void ucomisd(XMMRegister dst, Address src) { Assembler::ucomisd(dst, src); }
   void ucomisd(XMMRegister dst, AddressLiteral src);
   // Bitwise Logical XOR of Packed Double-Precision Floating-Point Values
   void xorpd(XMMRegister dst, XMMRegister src) { Assembler::xorpd(dst, src); }
   void xorpd(XMMRegister dst, Address src)     { Assembler::xorpd(dst, src); }
   void xorpd(XMMRegister dst, AddressLiteral src);
   // Bitwise Logical XOR of Packed Single-Precision Floating-Point Values
   void xorps(XMMRegister dst, XMMRegister src) { Assembler::xorps(dst, src); }
   void xorps(XMMRegister dst, Address src)     { Assembler::xorps(dst, src); }
   void xorps(XMMRegister dst, AddressLiteral src);
   // Data
   void cmov(Condition cc, Register dst, Register src) { LP64_ONLY(cmovq(cc, dst, src)) NOT_LP64(cmovl(cc, dst, src)); }
   void cmovptr(Condition cc, Register dst, Address src) { LP64_ONLY(cmovq(cc, dst, src)) NOT_LP64(cmovl(cc, dst, src)); }
   void cmovptr(Condition cc, Register dst, Register src) { LP64_ONLY(cmovq(cc, dst, src)) NOT_LP64(cmovl(cc, dst, src)); }
   void movoop(Register dst, jobject obj);
   void movoop(Address dst, jobject obj);
   void movptr(ArrayAddress dst, Register src);
   // can this do an lea?
   void movptr(Register dst, ArrayAddress src);
   void movptr(Register dst, Address src);
   void movptr(Register dst, AddressLiteral src);
   void movptr(Register dst, intptr_t src);
   void movptr(Register dst, Register src);
   void movptr(Address dst, intptr_t src);
   void movptr(Address dst, Register src);
 #ifdef _LP64
   // Generally the next two are only used for moving NULL
   // Although there are situations in initializing the mark word where
   // they could be used. They are dangerous.
   // They only exist on LP64 so that int32_t and intptr_t are not the same
   // and we have ambiguous declarations.
   void movptr(Address dst, int32_t imm32);
   void movptr(Register dst, int32_t imm32);
 #endif // _LP64
   // to avoid hiding movl
   void mov32(AddressLiteral dst, Register src);
   void mov32(Register dst, AddressLiteral src);
   // to avoid hiding movb
   void movbyte(ArrayAddress dst, int src);
   // Can push value or effective address
   void pushptr(AddressLiteral src);
   void pushptr(Address src) { LP64_ONLY(pushq(src)) NOT_LP64(pushl(src)); }
   void popptr(Address src) { LP64_ONLY(popq(src)) NOT_LP64(popl(src)); }
   void pushoop(jobject obj);
   // sign extend as need a l to ptr sized element
   void movl2ptr(Register dst, Address src) { LP64_ONLY(movslq(dst, src)) NOT_LP64(movl(dst, src)); }
   void movl2ptr(Register dst, Register src) { LP64_ONLY(movslq(dst, src)) NOT_LP64(if (dst != src) movl(dst, src)); }
 #undef VIRTUAL
 };
 /**
  * class SkipIfEqual:
  *
  * Instantiating this class will result in assembly code being output that will
  * jump around any code emitted between the creation of the instance and it's
  * automatic destruction at the end of a scope block, depending on the value of
  * the flag passed to the constructor, which will be checked at run-time.
  */
 class SkipIfEqual {
  private:
   MacroAssembler* _masm;
   Label _label;
  public:
    SkipIfEqual(MacroAssembler*, const bool* flag_addr, bool value);
    ~SkipIfEqual();
 };
 #ifdef ASSERT
 inline bool AbstractAssembler::pd_check_instruction_mark() { return true; }
 #endif

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/x86/vm/assembler_x86.hpp@7bb995fbd3c0 (annotated)

src/cpu/x86/vm/assembler_x86.hpp