src/x64/assembler-x64-inl.h - v8/v8 - Git at Google

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #ifndef V8_X64_ASSEMBLER_X64_INL_H_
 #define V8_X64_ASSEMBLER_X64_INL_H_

 #include "src/x64/assembler-x64.h"

 #include "src/base/cpu.h"
 #include "src/debug/debug.h"
 #include "src/objects-inl.h"
 #include "src/v8memory.h"

 namespace v8 {
 namespace internal {

 bool CpuFeatures::SupportsOptimizer() { return true; }

 bool CpuFeatures::SupportsWasmSimd128() { return IsSupported(SSE4_1); }

 // -----------------------------------------------------------------------------
 // Implementation of Assembler


 void Assembler::emitl(uint32_t x) {
   Memory<uint32_t>(pc_) = x;
   pc_ += sizeof(uint32_t);
 }

 void Assembler::emitp(Address x, RelocInfo::Mode rmode) {
   Memory<uintptr_t>(pc_) = x;
   if (!RelocInfo::IsNone(rmode)) {
     RecordRelocInfo(rmode, x);
   }
   pc_ += sizeof(uintptr_t);
 }


 void Assembler::emitq(uint64_t x) {
   Memory<uint64_t>(pc_) = x;
   pc_ += sizeof(uint64_t);
 }


 void Assembler::emitw(uint16_t x) {
   Memory<uint16_t>(pc_) = x;
   pc_ += sizeof(uint16_t);
 }

 void Assembler::emit_runtime_entry(Address entry, RelocInfo::Mode rmode) {
   DCHECK(RelocInfo::IsRuntimeEntry(rmode));
   RecordRelocInfo(rmode);
   emitl(static_cast<uint32_t>(entry - options().code_range_start));
 }

 void Assembler::emit(Immediate x) {
   if (!RelocInfo::IsNone(x.rmode_)) {
     RecordRelocInfo(x.rmode_);
   }
   emitl(x.value_);
 }

 void Assembler::emit_rex_64(Register reg, Register rm_reg) {
   emit(0x48 | reg.high_bit() << 2 | rm_reg.high_bit());
 }


 void Assembler::emit_rex_64(XMMRegister reg, Register rm_reg) {
   emit(0x48 | (reg.code() & 0x8) >> 1 | rm_reg.code() >> 3);
 }


 void Assembler::emit_rex_64(Register reg, XMMRegister rm_reg) {
   emit(0x48 | (reg.code() & 0x8) >> 1 | rm_reg.code() >> 3);
 }

 void Assembler::emit_rex_64(XMMRegister reg, XMMRegister rm_reg) {
   emit(0x48 | (reg.code() & 0x8) >> 1 | rm_reg.code() >> 3);
 }

 void Assembler::emit_rex_64(Register reg, Operand op) {
   emit(0x48 | reg.high_bit() << 2 | op.data().rex);
 }

 void Assembler::emit_rex_64(XMMRegister reg, Operand op) {
   emit(0x48 | (reg.code() & 0x8) >> 1 | op.data().rex);
 }


 void Assembler::emit_rex_64(Register rm_reg) {
   DCHECK_EQ(rm_reg.code() & 0xf, rm_reg.code());
   emit(0x48 | rm_reg.high_bit());
 }

 void Assembler::emit_rex_64(Operand op) { emit(0x48 | op.data().rex); }

 void Assembler::emit_rex_32(Register reg, Register rm_reg) {
   emit(0x40 | reg.high_bit() << 2 | rm_reg.high_bit());
 }

 void Assembler::emit_rex_32(Register reg, Operand op) {
   emit(0x40 | reg.high_bit() << 2 | op.data().rex);
 }


 void Assembler::emit_rex_32(Register rm_reg) {
   emit(0x40 | rm_reg.high_bit());
 }

 void Assembler::emit_rex_32(Operand op) { emit(0x40 | op.data().rex); }

 void Assembler::emit_optional_rex_32(Register reg, Register rm_reg) {
   byte rex_bits = reg.high_bit() << 2 | rm_reg.high_bit();
   if (rex_bits != 0) emit(0x40 | rex_bits);
 }

 void Assembler::emit_optional_rex_32(Register reg, Operand op) {
   byte rex_bits = reg.high_bit() << 2 | op.data().rex;
   if (rex_bits != 0) emit(0x40 | rex_bits);
 }

 void Assembler::emit_optional_rex_32(XMMRegister reg, Operand op) {
   byte rex_bits = (reg.code() & 0x8) >> 1 | op.data().rex;
   if (rex_bits != 0) emit(0x40 | rex_bits);
 }


 void Assembler::emit_optional_rex_32(XMMRegister reg, XMMRegister base) {
   byte rex_bits =  (reg.code() & 0x8) >> 1 | (base.code() & 0x8) >> 3;
   if (rex_bits != 0) emit(0x40 | rex_bits);
 }


 void Assembler::emit_optional_rex_32(XMMRegister reg, Register base) {
   byte rex_bits =  (reg.code() & 0x8) >> 1 | (base.code() & 0x8) >> 3;
   if (rex_bits != 0) emit(0x40 | rex_bits);
 }


 void Assembler::emit_optional_rex_32(Register reg, XMMRegister base) {
   byte rex_bits =  (reg.code() & 0x8) >> 1 | (base.code() & 0x8) >> 3;
   if (rex_bits != 0) emit(0x40 | rex_bits);
 }


 void Assembler::emit_optional_rex_32(Register rm_reg) {
   if (rm_reg.high_bit()) emit(0x41);
 }

 void Assembler::emit_optional_rex_32(XMMRegister rm_reg) {
   if (rm_reg.high_bit()) emit(0x41);
 }

 void Assembler::emit_optional_rex_32(Operand op) {
   if (op.data().rex != 0) emit(0x40 | op.data().rex);
 }


 // byte 1 of 3-byte VEX
 void Assembler::emit_vex3_byte1(XMMRegister reg, XMMRegister rm,
                                 LeadingOpcode m) {
   byte rxb = ~((reg.high_bit() << 2) | rm.high_bit()) << 5;
   emit(rxb | m);
 }


 // byte 1 of 3-byte VEX
 void Assembler::emit_vex3_byte1(XMMRegister reg, Operand rm, LeadingOpcode m) {
   byte rxb = ~((reg.high_bit() << 2) | rm.data().rex) << 5;
   emit(rxb | m);
 }


 // byte 1 of 2-byte VEX
 void Assembler::emit_vex2_byte1(XMMRegister reg, XMMRegister v, VectorLength l,
                                 SIMDPrefix pp) {
   byte rv = ~((reg.high_bit() << 4) | v.code()) << 3;
   emit(rv | l | pp);
 }


 // byte 2 of 3-byte VEX
 void Assembler::emit_vex3_byte2(VexW w, XMMRegister v, VectorLength l,
                                 SIMDPrefix pp) {
   emit(w | ((~v.code() & 0xf) << 3) | l | pp);
 }


 void Assembler::emit_vex_prefix(XMMRegister reg, XMMRegister vreg,
                                 XMMRegister rm, VectorLength l, SIMDPrefix pp,
                                 LeadingOpcode mm, VexW w) {
   if (rm.high_bit() || mm != k0F || w != kW0) {
     emit_vex3_byte0();
     emit_vex3_byte1(reg, rm, mm);
     emit_vex3_byte2(w, vreg, l, pp);
   } else {
     emit_vex2_byte0();
     emit_vex2_byte1(reg, vreg, l, pp);
   }
 }


 void Assembler::emit_vex_prefix(Register reg, Register vreg, Register rm,
                                 VectorLength l, SIMDPrefix pp, LeadingOpcode mm,
                                 VexW w) {
   XMMRegister ireg = XMMRegister::from_code(reg.code());
   XMMRegister ivreg = XMMRegister::from_code(vreg.code());
   XMMRegister irm = XMMRegister::from_code(rm.code());
   emit_vex_prefix(ireg, ivreg, irm, l, pp, mm, w);
 }

 void Assembler::emit_vex_prefix(XMMRegister reg, XMMRegister vreg, Operand rm,
                                 VectorLength l, SIMDPrefix pp, LeadingOpcode mm,
                                 VexW w) {
   if (rm.data().rex || mm != k0F || w != kW0) {
     emit_vex3_byte0();
     emit_vex3_byte1(reg, rm, mm);
     emit_vex3_byte2(w, vreg, l, pp);
   } else {
     emit_vex2_byte0();
     emit_vex2_byte1(reg, vreg, l, pp);
   }
 }

 void Assembler::emit_vex_prefix(Register reg, Register vreg, Operand rm,
                                 VectorLength l, SIMDPrefix pp, LeadingOpcode mm,
                                 VexW w) {
   XMMRegister ireg = XMMRegister::from_code(reg.code());
   XMMRegister ivreg = XMMRegister::from_code(vreg.code());
   emit_vex_prefix(ireg, ivreg, rm, l, pp, mm, w);
 }


 Address Assembler::target_address_at(Address pc, Address constant_pool) {
   return Memory<int32_t>(pc) + pc + 4;
 }

 void Assembler::set_target_address_at(Address pc, Address constant_pool,
                                       Address target,
                                       ICacheFlushMode icache_flush_mode) {
   Memory<int32_t>(pc) = static_cast<int32_t>(target - pc - 4);
   if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
     Assembler::FlushICache(pc, sizeof(int32_t));
   }
 }

 void Assembler::deserialization_set_target_internal_reference_at(
     Address pc, Address target, RelocInfo::Mode mode) {
   Memory<Address>(pc) = target;
 }


 Address Assembler::target_address_from_return_address(Address pc) {
   return pc - kCallTargetAddressOffset;
 }

 void Assembler::deserialization_set_special_target_at(
     Address instruction_payload, Code code, Address target) {
   set_target_address_at(instruction_payload,
                         !code.is_null() ? code->constant_pool() : kNullAddress,
                         target);
 }

 int Assembler::deserialization_special_target_size(
     Address instruction_payload) {
   return kSpecialTargetSize;
 }

 Handle<Code> Assembler::code_target_object_handle_at(Address pc) {
   return GetCodeTarget(Memory<int32_t>(pc));
 }

 Address Assembler::runtime_entry_at(Address pc) {
   return Memory<int32_t>(pc) + options().code_range_start;
 }

 // -----------------------------------------------------------------------------
 // Implementation of RelocInfo

 // The modes possibly affected by apply must be in kApplyMask.
 void RelocInfo::apply(intptr_t delta) {
   if (IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)) {
     Memory<int32_t>(pc_) -= static_cast<int32_t>(delta);
   } else if (IsInternalReference(rmode_)) {
     // absolute code pointer inside code object moves with the code object.
     Memory<Address>(pc_) += delta;
   }
 }


 Address RelocInfo::target_address() {
   DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_) || IsWasmCall(rmode_));
   return Assembler::target_address_at(pc_, constant_pool_);
 }

 Address RelocInfo::target_address_address() {
   DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_) || IsWasmCall(rmode_) ||
          IsWasmStubCall(rmode_) || IsEmbeddedObject(rmode_) ||
          IsExternalReference(rmode_) || IsOffHeapTarget(rmode_));
   return pc_;
 }


 Address RelocInfo::constant_pool_entry_address() {
   UNREACHABLE();
 }


 int RelocInfo::target_address_size() {
   if (IsCodedSpecially()) {
     return Assembler::kSpecialTargetSize;
   } else {
     return kPointerSize;
   }
 }

 HeapObject* RelocInfo::target_object() {
   DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   return HeapObject::cast(Memory<Object*>(pc_));
 }

 Handle<HeapObject> RelocInfo::target_object_handle(Assembler* origin) {
   DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   if (rmode_ == EMBEDDED_OBJECT) {
     return Handle<HeapObject>::cast(Memory<Handle<Object>>(pc_));
   } else {
     return origin->code_target_object_handle_at(pc_);
   }
 }

 Address RelocInfo::target_external_reference() {
   DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
   return Memory<Address>(pc_);
 }

 void RelocInfo::set_target_external_reference(
     Address target, ICacheFlushMode icache_flush_mode) {
   DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
   Memory<Address>(pc_) = target;
   if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
     Assembler::FlushICache(pc_, sizeof(Address));
   }
 }

 Address RelocInfo::target_internal_reference() {
   DCHECK(rmode_ == INTERNAL_REFERENCE);
   return Memory<Address>(pc_);
 }


 Address RelocInfo::target_internal_reference_address() {
   DCHECK(rmode_ == INTERNAL_REFERENCE);
   return pc_;
 }

 void RelocInfo::set_target_object(Heap* heap, HeapObject* target,
                                   WriteBarrierMode write_barrier_mode,
                                   ICacheFlushMode icache_flush_mode) {
   DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   Memory<Object*>(pc_) = target;
   if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
     Assembler::FlushICache(pc_, sizeof(Address));
   }
   if (write_barrier_mode == UPDATE_WRITE_BARRIER && !host().is_null()) {
     WriteBarrierForCode(host(), this, target);
   }
 }


 Address RelocInfo::target_runtime_entry(Assembler* origin) {
   DCHECK(IsRuntimeEntry(rmode_));
   return origin->runtime_entry_at(pc_);
 }

 void RelocInfo::set_target_runtime_entry(Address target,
                                          WriteBarrierMode write_barrier_mode,
                                          ICacheFlushMode icache_flush_mode) {
   DCHECK(IsRuntimeEntry(rmode_));
   if (target_address() != target) {
     set_target_address(target, write_barrier_mode, icache_flush_mode);
   }
 }

 Address RelocInfo::target_off_heap_target() {
   DCHECK(IsOffHeapTarget(rmode_));
   return Memory<Address>(pc_);
 }

 void RelocInfo::WipeOut() {
   if (IsEmbeddedObject(rmode_) || IsExternalReference(rmode_) ||
       IsInternalReference(rmode_) || IsOffHeapTarget(rmode_)) {
     Memory<Address>(pc_) = kNullAddress;
   } else if (IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)) {
     // Effectively write zero into the relocation.
     Assembler::set_target_address_at(pc_, constant_pool_,
                                      pc_ + sizeof(int32_t));
   } else {
     UNREACHABLE();
   }
 }

 template <typename ObjectVisitor>
 void RelocInfo::Visit(ObjectVisitor* visitor) {
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {
     visitor->VisitEmbeddedPointer(host(), this);
     Assembler::FlushICache(pc_, sizeof(Address));
   } else if (RelocInfo::IsCodeTargetMode(mode)) {
     visitor->VisitCodeTarget(host(), this);
   } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
     visitor->VisitExternalReference(host(), this);
   } else if (mode == RelocInfo::INTERNAL_REFERENCE) {
     visitor->VisitInternalReference(host(), this);
   } else if (RelocInfo::IsRuntimeEntry(mode)) {
     visitor->VisitRuntimeEntry(host(), this);
   } else if (RelocInfo::IsOffHeapTarget(mode)) {
     visitor->VisitOffHeapTarget(host(), this);
   }
 }

 }  // namespace internal
 }  // namespace v8

 #endif  // V8_X64_ASSEMBLER_X64_INL_H_
	// Copyright 2012 the V8 project authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#ifndef V8_X64_ASSEMBLER_X64_INL_H_
	#define V8_X64_ASSEMBLER_X64_INL_H_

	#include "src/x64/assembler-x64.h"

	#include "src/base/cpu.h"
	#include "src/debug/debug.h"
	#include "src/objects-inl.h"
	#include "src/v8memory.h"

	namespace v8 {
	namespace internal {

	bool CpuFeatures::SupportsOptimizer() { return true; }

	bool CpuFeatures::SupportsWasmSimd128() { return IsSupported(SSE4_1); }

	// -----------------------------------------------------------------------------
	// Implementation of Assembler


	void Assembler::emitl(uint32_t x) {
	Memory<uint32_t>(pc_) = x;
	pc_ += sizeof(uint32_t);
	}

	void Assembler::emitp(Address x, RelocInfo::Mode rmode) {
	Memory<uintptr_t>(pc_) = x;
	if (!RelocInfo::IsNone(rmode)) {
	RecordRelocInfo(rmode, x);
	}
	pc_ += sizeof(uintptr_t);
	}


	void Assembler::emitq(uint64_t x) {
	Memory<uint64_t>(pc_) = x;
	pc_ += sizeof(uint64_t);
	}


	void Assembler::emitw(uint16_t x) {
	Memory<uint16_t>(pc_) = x;
	pc_ += sizeof(uint16_t);
	}

	void Assembler::emit_runtime_entry(Address entry, RelocInfo::Mode rmode) {
	DCHECK(RelocInfo::IsRuntimeEntry(rmode));
	RecordRelocInfo(rmode);
	emitl(static_cast<uint32_t>(entry - options().code_range_start));
	}

	void Assembler::emit(Immediate x) {
	if (!RelocInfo::IsNone(x.rmode_)) {
	RecordRelocInfo(x.rmode_);
	}
	emitl(x.value_);
	}

	void Assembler::emit_rex_64(Register reg, Register rm_reg) {
	emit(0x48 \| reg.high_bit() << 2 \| rm_reg.high_bit());
	}


	void Assembler::emit_rex_64(XMMRegister reg, Register rm_reg) {
	emit(0x48 \| (reg.code() & 0x8) >> 1 \| rm_reg.code() >> 3);
	}


	void Assembler::emit_rex_64(Register reg, XMMRegister rm_reg) {
	emit(0x48 \| (reg.code() & 0x8) >> 1 \| rm_reg.code() >> 3);
	}

	void Assembler::emit_rex_64(XMMRegister reg, XMMRegister rm_reg) {
	emit(0x48 \| (reg.code() & 0x8) >> 1 \| rm_reg.code() >> 3);
	}

	void Assembler::emit_rex_64(Register reg, Operand op) {
	emit(0x48 \| reg.high_bit() << 2 \| op.data().rex);
	}

	void Assembler::emit_rex_64(XMMRegister reg, Operand op) {
	emit(0x48 \| (reg.code() & 0x8) >> 1 \| op.data().rex);
	}


	void Assembler::emit_rex_64(Register rm_reg) {
	DCHECK_EQ(rm_reg.code() & 0xf, rm_reg.code());
	emit(0x48 \| rm_reg.high_bit());
	}

	void Assembler::emit_rex_64(Operand op) { emit(0x48 \| op.data().rex); }

	void Assembler::emit_rex_32(Register reg, Register rm_reg) {
	emit(0x40 \| reg.high_bit() << 2 \| rm_reg.high_bit());
	}

	void Assembler::emit_rex_32(Register reg, Operand op) {
	emit(0x40 \| reg.high_bit() << 2 \| op.data().rex);
	}


	void Assembler::emit_rex_32(Register rm_reg) {
	emit(0x40 \| rm_reg.high_bit());
	}

	void Assembler::emit_rex_32(Operand op) { emit(0x40 \| op.data().rex); }

	void Assembler::emit_optional_rex_32(Register reg, Register rm_reg) {
	byte rex_bits = reg.high_bit() << 2 \| rm_reg.high_bit();
	if (rex_bits != 0) emit(0x40 \| rex_bits);
	}

	void Assembler::emit_optional_rex_32(Register reg, Operand op) {
	byte rex_bits = reg.high_bit() << 2 \| op.data().rex;
	if (rex_bits != 0) emit(0x40 \| rex_bits);
	}

	void Assembler::emit_optional_rex_32(XMMRegister reg, Operand op) {
	byte rex_bits = (reg.code() & 0x8) >> 1 \| op.data().rex;
	if (rex_bits != 0) emit(0x40 \| rex_bits);
	}


	void Assembler::emit_optional_rex_32(XMMRegister reg, XMMRegister base) {
	byte rex_bits = (reg.code() & 0x8) >> 1 \| (base.code() & 0x8) >> 3;
	if (rex_bits != 0) emit(0x40 \| rex_bits);
	}


	void Assembler::emit_optional_rex_32(XMMRegister reg, Register base) {
	byte rex_bits = (reg.code() & 0x8) >> 1 \| (base.code() & 0x8) >> 3;
	if (rex_bits != 0) emit(0x40 \| rex_bits);
	}


	void Assembler::emit_optional_rex_32(Register reg, XMMRegister base) {
	byte rex_bits = (reg.code() & 0x8) >> 1 \| (base.code() & 0x8) >> 3;
	if (rex_bits != 0) emit(0x40 \| rex_bits);
	}


	void Assembler::emit_optional_rex_32(Register rm_reg) {
	if (rm_reg.high_bit()) emit(0x41);
	}

	void Assembler::emit_optional_rex_32(XMMRegister rm_reg) {
	if (rm_reg.high_bit()) emit(0x41);
	}

	void Assembler::emit_optional_rex_32(Operand op) {
	if (op.data().rex != 0) emit(0x40 \| op.data().rex);
	}


	// byte 1 of 3-byte VEX
	void Assembler::emit_vex3_byte1(XMMRegister reg, XMMRegister rm,
	LeadingOpcode m) {
	byte rxb = ~((reg.high_bit() << 2) \| rm.high_bit()) << 5;
	emit(rxb \| m);
	}


	// byte 1 of 3-byte VEX
	void Assembler::emit_vex3_byte1(XMMRegister reg, Operand rm, LeadingOpcode m) {
	byte rxb = ~((reg.high_bit() << 2) \| rm.data().rex) << 5;
	emit(rxb \| m);
	}


	// byte 1 of 2-byte VEX
	void Assembler::emit_vex2_byte1(XMMRegister reg, XMMRegister v, VectorLength l,
	SIMDPrefix pp) {
	byte rv = ~((reg.high_bit() << 4) \| v.code()) << 3;
	emit(rv \| l \| pp);
	}


	// byte 2 of 3-byte VEX
	void Assembler::emit_vex3_byte2(VexW w, XMMRegister v, VectorLength l,
	SIMDPrefix pp) {
	emit(w \| ((~v.code() & 0xf) << 3) \| l \| pp);
	}


	void Assembler::emit_vex_prefix(XMMRegister reg, XMMRegister vreg,
	XMMRegister rm, VectorLength l, SIMDPrefix pp,
	LeadingOpcode mm, VexW w) {
	if (rm.high_bit() \|\| mm != k0F \|\| w != kW0) {
	emit_vex3_byte0();
	emit_vex3_byte1(reg, rm, mm);
	emit_vex3_byte2(w, vreg, l, pp);
	} else {
	emit_vex2_byte0();
	emit_vex2_byte1(reg, vreg, l, pp);
	}
	}


	void Assembler::emit_vex_prefix(Register reg, Register vreg, Register rm,
	VectorLength l, SIMDPrefix pp, LeadingOpcode mm,
	VexW w) {
	XMMRegister ireg = XMMRegister::from_code(reg.code());
	XMMRegister ivreg = XMMRegister::from_code(vreg.code());
	XMMRegister irm = XMMRegister::from_code(rm.code());
	emit_vex_prefix(ireg, ivreg, irm, l, pp, mm, w);
	}

	void Assembler::emit_vex_prefix(XMMRegister reg, XMMRegister vreg, Operand rm,
	VectorLength l, SIMDPrefix pp, LeadingOpcode mm,
	VexW w) {
	if (rm.data().rex \|\| mm != k0F \|\| w != kW0) {
	emit_vex3_byte0();
	emit_vex3_byte1(reg, rm, mm);
	emit_vex3_byte2(w, vreg, l, pp);
	} else {
	emit_vex2_byte0();
	emit_vex2_byte1(reg, vreg, l, pp);
	}
	}

	void Assembler::emit_vex_prefix(Register reg, Register vreg, Operand rm,
	VectorLength l, SIMDPrefix pp, LeadingOpcode mm,
	VexW w) {
	XMMRegister ireg = XMMRegister::from_code(reg.code());
	XMMRegister ivreg = XMMRegister::from_code(vreg.code());
	emit_vex_prefix(ireg, ivreg, rm, l, pp, mm, w);
	}


	Address Assembler::target_address_at(Address pc, Address constant_pool) {
	return Memory<int32_t>(pc) + pc + 4;
	}

	void Assembler::set_target_address_at(Address pc, Address constant_pool,
	Address target,
	ICacheFlushMode icache_flush_mode) {
	Memory<int32_t>(pc) = static_cast<int32_t>(target - pc - 4);
	if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
	Assembler::FlushICache(pc, sizeof(int32_t));
	}
	}

	void Assembler::deserialization_set_target_internal_reference_at(
	Address pc, Address target, RelocInfo::Mode mode) {
	Memory<Address>(pc) = target;
	}


	Address Assembler::target_address_from_return_address(Address pc) {
	return pc - kCallTargetAddressOffset;
	}

	void Assembler::deserialization_set_special_target_at(
	Address instruction_payload, Code code, Address target) {
	set_target_address_at(instruction_payload,
	!code.is_null() ? code->constant_pool() : kNullAddress,
	target);
	}

	int Assembler::deserialization_special_target_size(
	Address instruction_payload) {
	return kSpecialTargetSize;
	}

	Handle<Code> Assembler::code_target_object_handle_at(Address pc) {
	return GetCodeTarget(Memory<int32_t>(pc));
	}

	Address Assembler::runtime_entry_at(Address pc) {
	return Memory<int32_t>(pc) + options().code_range_start;
	}

	// -----------------------------------------------------------------------------
	// Implementation of RelocInfo

	// The modes possibly affected by apply must be in kApplyMask.
	void RelocInfo::apply(intptr_t delta) {
	if (IsCodeTarget(rmode_) \|\| IsRuntimeEntry(rmode_)) {
	Memory<int32_t>(pc_) -= static_cast<int32_t>(delta);
	} else if (IsInternalReference(rmode_)) {
	// absolute code pointer inside code object moves with the code object.
	Memory<Address>(pc_) += delta;
	}
	}


	Address RelocInfo::target_address() {
	DCHECK(IsCodeTarget(rmode_) \|\| IsRuntimeEntry(rmode_) \|\| IsWasmCall(rmode_));
	return Assembler::target_address_at(pc_, constant_pool_);
	}

	Address RelocInfo::target_address_address() {
	DCHECK(IsCodeTarget(rmode_) \|\| IsRuntimeEntry(rmode_) \|\| IsWasmCall(rmode_) \|\|
	IsWasmStubCall(rmode_) \|\| IsEmbeddedObject(rmode_) \|\|
	IsExternalReference(rmode_) \|\| IsOffHeapTarget(rmode_));
	return pc_;
	}


	Address RelocInfo::constant_pool_entry_address() {
	UNREACHABLE();
	}


	int RelocInfo::target_address_size() {
	if (IsCodedSpecially()) {
	return Assembler::kSpecialTargetSize;
	} else {
	return kPointerSize;
	}
	}

	HeapObject* RelocInfo::target_object() {
	DCHECK(IsCodeTarget(rmode_) \|\| rmode_ == EMBEDDED_OBJECT);
	return HeapObject::cast(Memory<Object*>(pc_));
	}

	Handle<HeapObject> RelocInfo::target_object_handle(Assembler* origin) {
	DCHECK(IsCodeTarget(rmode_) \|\| rmode_ == EMBEDDED_OBJECT);
	if (rmode_ == EMBEDDED_OBJECT) {
	return Handle<HeapObject>::cast(Memory<Handle<Object>>(pc_));
	} else {
	return origin->code_target_object_handle_at(pc_);
	}
	}

	Address RelocInfo::target_external_reference() {
	DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
	return Memory<Address>(pc_);
	}

	void RelocInfo::set_target_external_reference(
	Address target, ICacheFlushMode icache_flush_mode) {
	DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
	Memory<Address>(pc_) = target;
	if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
	Assembler::FlushICache(pc_, sizeof(Address));
	}
	}

	Address RelocInfo::target_internal_reference() {
	DCHECK(rmode_ == INTERNAL_REFERENCE);
	return Memory<Address>(pc_);
	}


	Address RelocInfo::target_internal_reference_address() {
	DCHECK(rmode_ == INTERNAL_REFERENCE);
	return pc_;
	}

	void RelocInfo::set_target_object(Heap* heap, HeapObject* target,
	WriteBarrierMode write_barrier_mode,
	ICacheFlushMode icache_flush_mode) {
	DCHECK(IsCodeTarget(rmode_) \|\| rmode_ == EMBEDDED_OBJECT);
	Memory<Object*>(pc_) = target;
	if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
	Assembler::FlushICache(pc_, sizeof(Address));
	}
	if (write_barrier_mode == UPDATE_WRITE_BARRIER && !host().is_null()) {
	WriteBarrierForCode(host(), this, target);
	}
	}


	Address RelocInfo::target_runtime_entry(Assembler* origin) {
	DCHECK(IsRuntimeEntry(rmode_));
	return origin->runtime_entry_at(pc_);
	}

	void RelocInfo::set_target_runtime_entry(Address target,
	WriteBarrierMode write_barrier_mode,
	ICacheFlushMode icache_flush_mode) {
	DCHECK(IsRuntimeEntry(rmode_));
	if (target_address() != target) {
	set_target_address(target, write_barrier_mode, icache_flush_mode);
	}
	}

	Address RelocInfo::target_off_heap_target() {
	DCHECK(IsOffHeapTarget(rmode_));
	return Memory<Address>(pc_);
	}

	void RelocInfo::WipeOut() {
	if (IsEmbeddedObject(rmode_) \|\| IsExternalReference(rmode_) \|\|
	IsInternalReference(rmode_) \|\| IsOffHeapTarget(rmode_)) {
	Memory<Address>(pc_) = kNullAddress;
	} else if (IsCodeTarget(rmode_) \|\| IsRuntimeEntry(rmode_)) {
	// Effectively write zero into the relocation.
	Assembler::set_target_address_at(pc_, constant_pool_,
	pc_ + sizeof(int32_t));
	} else {
	UNREACHABLE();
	}
	}

	template <typename ObjectVisitor>
	void RelocInfo::Visit(ObjectVisitor* visitor) {
	RelocInfo::Mode mode = rmode();
	if (mode == RelocInfo::EMBEDDED_OBJECT) {
	visitor->VisitEmbeddedPointer(host(), this);
	Assembler::FlushICache(pc_, sizeof(Address));
	} else if (RelocInfo::IsCodeTargetMode(mode)) {
	visitor->VisitCodeTarget(host(), this);
	} else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
	visitor->VisitExternalReference(host(), this);
	} else if (mode == RelocInfo::INTERNAL_REFERENCE) {
	visitor->VisitInternalReference(host(), this);
	} else if (RelocInfo::IsRuntimeEntry(mode)) {
	visitor->VisitRuntimeEntry(host(), this);
	} else if (RelocInfo::IsOffHeapTarget(mode)) {
	visitor->VisitOffHeapTarget(host(), this);
	}
	}

	} // namespace internal
	} // namespace v8

	#endif // V8_X64_ASSEMBLER_X64_INL_H_