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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_COMPILER_OPTIMIZING_COMMON_ARM64_H_
#define ART_COMPILER_OPTIMIZING_COMMON_ARM64_H_
#include "code_generator.h"
#include "instruction_simplifier_shared.h"
#include "locations.h"
#include "nodes.h"
#include "utils/arm64/assembler_arm64.h"
// TODO(VIXL): Make VIXL compile with -Wshadow.
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wshadow"
#include "aarch64/disasm-aarch64.h"
#include "aarch64/macro-assembler-aarch64.h"
#include "aarch64/simulator-aarch64.h"
#pragma GCC diagnostic pop
namespace art {
using helpers::CanFitInShifterOperand;
using helpers::HasShifterOperand;
namespace arm64 {
namespace helpers {
// Convenience helpers to ease conversion to and from VIXL operands.
static_assert((SP == 31) && (WSP == 31) && (XZR == 32) && (WZR == 32),
"Unexpected values for register codes.");
inline int VIXLRegCodeFromART(int code) {
if (code == SP) {
return vixl::aarch64::kSPRegInternalCode;
}
if (code == XZR) {
return vixl::aarch64::kZeroRegCode;
}
return code;
}
inline int ARTRegCodeFromVIXL(int code) {
if (code == vixl::aarch64::kSPRegInternalCode) {
return SP;
}
if (code == vixl::aarch64::kZeroRegCode) {
return XZR;
}
return code;
}
inline vixl::aarch64::Register XRegisterFrom(Location location) {
DCHECK(location.IsRegister()) << location;
return vixl::aarch64::Register::GetXRegFromCode(VIXLRegCodeFromART(location.reg()));
}
inline vixl::aarch64::Register WRegisterFrom(Location location) {
DCHECK(location.IsRegister()) << location;
return vixl::aarch64::Register::GetWRegFromCode(VIXLRegCodeFromART(location.reg()));
}
inline vixl::aarch64::Register RegisterFrom(Location location, DataType::Type type) {
DCHECK(type != DataType::Type::kVoid && !DataType::IsFloatingPointType(type)) << type;
return type == DataType::Type::kInt64 ? XRegisterFrom(location) : WRegisterFrom(location);
}
inline vixl::aarch64::Register OutputRegister(HInstruction* instr) {
return RegisterFrom(instr->GetLocations()->Out(), instr->GetType());
}
inline vixl::aarch64::Register InputRegisterAt(HInstruction* instr, int input_index) {
return RegisterFrom(instr->GetLocations()->InAt(input_index),
instr->InputAt(input_index)->GetType());
}
inline vixl::aarch64::FPRegister DRegisterFrom(Location location) {
DCHECK(location.IsFpuRegister()) << location;
return vixl::aarch64::FPRegister::GetDRegFromCode(location.reg());
}
inline vixl::aarch64::FPRegister QRegisterFrom(Location location) {
DCHECK(location.IsFpuRegister()) << location;
return vixl::aarch64::FPRegister::GetQRegFromCode(location.reg());
}
inline vixl::aarch64::FPRegister VRegisterFrom(Location location) {
DCHECK(location.IsFpuRegister()) << location;
return vixl::aarch64::FPRegister::GetVRegFromCode(location.reg());
}
inline vixl::aarch64::FPRegister SRegisterFrom(Location location) {
DCHECK(location.IsFpuRegister()) << location;
return vixl::aarch64::FPRegister::GetSRegFromCode(location.reg());
}
inline vixl::aarch64::FPRegister FPRegisterFrom(Location location, DataType::Type type) {
DCHECK(DataType::IsFloatingPointType(type)) << type;
return type == DataType::Type::kFloat64 ? DRegisterFrom(location) : SRegisterFrom(location);
}
inline vixl::aarch64::FPRegister OutputFPRegister(HInstruction* instr) {
return FPRegisterFrom(instr->GetLocations()->Out(), instr->GetType());
}
inline vixl::aarch64::FPRegister InputFPRegisterAt(HInstruction* instr, int input_index) {
return FPRegisterFrom(instr->GetLocations()->InAt(input_index),
instr->InputAt(input_index)->GetType());
}
inline vixl::aarch64::CPURegister CPURegisterFrom(Location location, DataType::Type type) {
return DataType::IsFloatingPointType(type)
? vixl::aarch64::CPURegister(FPRegisterFrom(location, type))
: vixl::aarch64::CPURegister(RegisterFrom(location, type));
}
inline vixl::aarch64::CPURegister OutputCPURegister(HInstruction* instr) {
return DataType::IsFloatingPointType(instr->GetType())
? static_cast<vixl::aarch64::CPURegister>(OutputFPRegister(instr))
: static_cast<vixl::aarch64::CPURegister>(OutputRegister(instr));
}
inline vixl::aarch64::CPURegister InputCPURegisterAt(HInstruction* instr, int index) {
return DataType::IsFloatingPointType(instr->InputAt(index)->GetType())
? static_cast<vixl::aarch64::CPURegister>(InputFPRegisterAt(instr, index))
: static_cast<vixl::aarch64::CPURegister>(InputRegisterAt(instr, index));
}
inline vixl::aarch64::CPURegister InputCPURegisterOrZeroRegAt(HInstruction* instr,
int index) {
HInstruction* input = instr->InputAt(index);
DataType::Type input_type = input->GetType();
if (input->IsConstant() && input->AsConstant()->IsZeroBitPattern()) {
return (DataType::Size(input_type) >= vixl::aarch64::kXRegSizeInBytes)
? vixl::aarch64::Register(vixl::aarch64::xzr)
: vixl::aarch64::Register(vixl::aarch64::wzr);
}
return InputCPURegisterAt(instr, index);
}
inline int64_t Int64ConstantFrom(Location location) {
HConstant* instr = location.GetConstant();
if (instr->IsIntConstant()) {
return instr->AsIntConstant()->GetValue();
} else if (instr->IsNullConstant()) {
return 0;
} else {
DCHECK(instr->IsLongConstant()) << instr->DebugName();
return instr->AsLongConstant()->GetValue();
}
}
inline vixl::aarch64::Operand OperandFrom(Location location, DataType::Type type) {
if (location.IsRegister()) {
return vixl::aarch64::Operand(RegisterFrom(location, type));
} else {
return vixl::aarch64::Operand(Int64ConstantFrom(location));
}
}
inline vixl::aarch64::Operand InputOperandAt(HInstruction* instr, int input_index) {
return OperandFrom(instr->GetLocations()->InAt(input_index),
instr->InputAt(input_index)->GetType());
}
inline vixl::aarch64::MemOperand StackOperandFrom(Location location) {
return vixl::aarch64::MemOperand(vixl::aarch64::sp, location.GetStackIndex());
}
inline vixl::aarch64::MemOperand HeapOperand(const vixl::aarch64::Register& base,
size_t offset = 0) {
// A heap reference must be 32bit, so fit in a W register.
DCHECK(base.IsW());
return vixl::aarch64::MemOperand(base.X(), offset);
}
inline vixl::aarch64::MemOperand HeapOperand(const vixl::aarch64::Register& base,
const vixl::aarch64::Register& regoffset,
vixl::aarch64::Shift shift = vixl::aarch64::LSL,
unsigned shift_amount = 0) {
// A heap reference must be 32bit, so fit in a W register.
DCHECK(base.IsW());
return vixl::aarch64::MemOperand(base.X(), regoffset, shift, shift_amount);
}
inline vixl::aarch64::MemOperand HeapOperand(const vixl::aarch64::Register& base,
Offset offset) {
return HeapOperand(base, offset.SizeValue());
}
inline vixl::aarch64::MemOperand HeapOperandFrom(Location location, Offset offset) {
return HeapOperand(RegisterFrom(location, DataType::Type::kReference), offset);
}
inline Location LocationFrom(const vixl::aarch64::Register& reg) {
return Location::RegisterLocation(ARTRegCodeFromVIXL(reg.GetCode()));
}
inline Location LocationFrom(const vixl::aarch64::FPRegister& fpreg) {
return Location::FpuRegisterLocation(fpreg.GetCode());
}
inline vixl::aarch64::Operand OperandFromMemOperand(
const vixl::aarch64::MemOperand& mem_op) {
if (mem_op.IsImmediateOffset()) {
return vixl::aarch64::Operand(mem_op.GetOffset());
} else {
DCHECK(mem_op.IsRegisterOffset());
if (mem_op.GetExtend() != vixl::aarch64::NO_EXTEND) {
return vixl::aarch64::Operand(mem_op.GetRegisterOffset(),
mem_op.GetExtend(),
mem_op.GetShiftAmount());
} else if (mem_op.GetShift() != vixl::aarch64::NO_SHIFT) {
return vixl::aarch64::Operand(mem_op.GetRegisterOffset(),
mem_op.GetShift(),
mem_op.GetShiftAmount());
} else {
LOG(FATAL) << "Should not reach here";
UNREACHABLE();
}
}
}
inline bool Arm64CanEncodeConstantAsImmediate(HConstant* constant, HInstruction* instr) {
int64_t value = CodeGenerator::GetInt64ValueOf(constant);
// TODO: Improve this when IsSIMDConstantEncodable method is implemented in VIXL.
if (instr->IsVecReplicateScalar()) {
if (constant->IsLongConstant()) {
return false;
} else if (constant->IsFloatConstant()) {
return vixl::aarch64::Assembler::IsImmFP32(constant->AsFloatConstant()->GetValue());
} else if (constant->IsDoubleConstant()) {
return vixl::aarch64::Assembler::IsImmFP64(constant->AsDoubleConstant()->GetValue());
}
return IsUint<8>(value);
}
// For single uses we let VIXL handle the constant generation since it will
// use registers that are not managed by the register allocator (wip0, wip1).
if (constant->GetUses().HasExactlyOneElement()) {
return true;
}
// Our code generator ensures shift distances are within an encodable range.
if (instr->IsRor()) {
return true;
}
if (instr->IsAnd() || instr->IsOr() || instr->IsXor()) {
// Uses logical operations.
return vixl::aarch64::Assembler::IsImmLogical(value, vixl::aarch64::kXRegSize);
} else if (instr->IsNeg()) {
// Uses mov -immediate.
return vixl::aarch64::Assembler::IsImmMovn(value, vixl::aarch64::kXRegSize);
} else {
DCHECK(instr->IsAdd() ||
instr->IsIntermediateAddress() ||
instr->IsBoundsCheck() ||
instr->IsCompare() ||
instr->IsCondition() ||
instr->IsSub())
<< instr->DebugName();
// Uses aliases of ADD/SUB instructions.
// If `value` does not fit but `-value` does, VIXL will automatically use
// the 'opposite' instruction.
return vixl::aarch64::Assembler::IsImmAddSub(value)
|| vixl::aarch64::Assembler::IsImmAddSub(-value);
}
}
inline Location ARM64EncodableConstantOrRegister(HInstruction* constant,
HInstruction* instr) {
if (constant->IsConstant()
&& Arm64CanEncodeConstantAsImmediate(constant->AsConstant(), instr)) {
return Location::ConstantLocation(constant->AsConstant());
}
return Location::RequiresRegister();
}
// Check if registers in art register set have the same register code in vixl. If the register
// codes are same, we can initialize vixl register list simply by the register masks. Currently,
// only SP/WSP and ZXR/WZR codes are different between art and vixl.
// Note: This function is only used for debug checks.
inline bool ArtVixlRegCodeCoherentForRegSet(uint32_t art_core_registers,
size_t num_core,
uint32_t art_fpu_registers,
size_t num_fpu) {
// The register masks won't work if the number of register is larger than 32.
DCHECK_GE(sizeof(art_core_registers) * 8, num_core);
DCHECK_GE(sizeof(art_fpu_registers) * 8, num_fpu);
for (size_t art_reg_code = 0; art_reg_code < num_core; ++art_reg_code) {
if (RegisterSet::Contains(art_core_registers, art_reg_code)) {
if (art_reg_code != static_cast<size_t>(VIXLRegCodeFromART(art_reg_code))) {
return false;
}
}
}
// There is no register code translation for float registers.
return true;
}
inline vixl::aarch64::Shift ShiftFromOpKind(HDataProcWithShifterOp::OpKind op_kind) {
switch (op_kind) {
case HDataProcWithShifterOp::kASR: return vixl::aarch64::ASR;
case HDataProcWithShifterOp::kLSL: return vixl::aarch64::LSL;
case HDataProcWithShifterOp::kLSR: return vixl::aarch64::LSR;
default:
LOG(FATAL) << "Unexpected op kind " << op_kind;
UNREACHABLE();
return vixl::aarch64::NO_SHIFT;
}
}
inline vixl::aarch64::Extend ExtendFromOpKind(HDataProcWithShifterOp::OpKind op_kind) {
switch (op_kind) {
case HDataProcWithShifterOp::kUXTB: return vixl::aarch64::UXTB;
case HDataProcWithShifterOp::kUXTH: return vixl::aarch64::UXTH;
case HDataProcWithShifterOp::kUXTW: return vixl::aarch64::UXTW;
case HDataProcWithShifterOp::kSXTB: return vixl::aarch64::SXTB;
case HDataProcWithShifterOp::kSXTH: return vixl::aarch64::SXTH;
case HDataProcWithShifterOp::kSXTW: return vixl::aarch64::SXTW;
default:
LOG(FATAL) << "Unexpected op kind " << op_kind;
UNREACHABLE();
return vixl::aarch64::NO_EXTEND;
}
}
inline bool ShifterOperandSupportsExtension(HInstruction* instruction) {
DCHECK(HasShifterOperand(instruction, InstructionSet::kArm64));
// Although the `neg` instruction is an alias of the `sub` instruction, `HNeg`
// does *not* support extension. This is because the `extended register` form
// of the `sub` instruction interprets the left register with code 31 as the
// stack pointer and not the zero register. (So does the `immediate` form.) In
// the other form `shifted register, the register with code 31 is interpreted
// as the zero register.
return instruction->IsAdd() || instruction->IsSub();
}
inline bool IsConstantZeroBitPattern(const HInstruction* instruction) {
return instruction->IsConstant() && instruction->AsConstant()->IsZeroBitPattern();
}
} // namespace helpers
} // namespace arm64
} // namespace art
#endif // ART_COMPILER_OPTIMIZING_COMMON_ARM64_H_