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// Copyright 2021 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_CODEGEN_LOONG64_REGISTER_LOONG64_H_
#define V8_CODEGEN_LOONG64_REGISTER_LOONG64_H_
#include "src/codegen/loong64/constants-loong64.h"
#include "src/codegen/register-base.h"
namespace v8 {
namespace internal {
// clang-format off
#define GENERAL_REGISTERS(V) \
V(zero_reg) V(ra) V(tp) V(sp) \
V(a0) V(a1) V(a2) V(a3) V(a4) V(a5) V(a6) V(a7) \
V(t0) V(t1) V(t2) V(t3) V(t4) V(t5) V(t6) V(t7) V(t8) \
V(x_reg) V(fp) \
V(s0) V(s1) V(s2) V(s3) V(s4) V(s5) V(s6) V(s7) V(s8) \
#define ALLOCATABLE_GENERAL_REGISTERS(V) \
V(a0) V(a1) V(a2) V(a3) V(a4) V(a5) V(a6) V(a7) \
V(t0) V(t1) V(t2) V(t3) V(t4) V(t5) \
V(s0) V(s1) V(s2) V(s3) V(s4) V(s5) V(s7) V(s8)
#define DOUBLE_REGISTERS(V) \
V(f0) V(f1) V(f2) V(f3) V(f4) V(f5) V(f6) V(f7) \
V(f8) V(f9) V(f10) V(f11) V(f12) V(f13) V(f14) V(f15) \
V(f16) V(f17) V(f18) V(f19) V(f20) V(f21) V(f22) V(f23) \
V(f24) V(f25) V(f26) V(f27) V(f28) V(f29) V(f30) V(f31)
#define FLOAT_REGISTERS DOUBLE_REGISTERS
#define SIMD128_REGISTERS(V) \
V(w0) V(w1) V(w2) V(w3) V(w4) V(w5) V(w6) V(w7) \
V(w8) V(w9) V(w10) V(w11) V(w12) V(w13) V(w14) V(w15) \
V(w16) V(w17) V(w18) V(w19) V(w20) V(w21) V(w22) V(w23) \
V(w24) V(w25) V(w26) V(w27) V(w28) V(w29) V(w30) V(w31)
#define ALLOCATABLE_DOUBLE_REGISTERS(V) \
V(f0) V(f1) V(f2) V(f3) V(f4) V(f5) V(f6) V(f7) \
V(f8) V(f9) V(f10) V(f11) V(f12) V(f13) V(f14) V(f15) V(f16) \
V(f17) V(f18) V(f19) V(f20) V(f21) V(f22) V(f23)
// clang-format on
// Note that the bit values must match those used in actual instruction
// encoding.
const int kNumRegs = 32;
// CPU Registers.
//
// 1) We would prefer to use an enum, but enum values are assignment-
// compatible with int, which has caused code-generation bugs.
//
// 2) We would prefer to use a class instead of a struct but we don't like
// the register initialization to depend on the particular initialization
// order (which appears to be different on OS X, Linux, and Windows for the
// installed versions of C++ we tried). Using a struct permits C-style
// "initialization". Also, the Register objects cannot be const as this
// forces initialization stubs in MSVC, making us dependent on initialization
// order.
//
// 3) By not using an enum, we are possibly preventing the compiler from
// doing certain constant folds, which may significantly reduce the
// code generated for some assembly instructions (because they boil down
// to a few constants). If this is a problem, we could change the code
// such that we use an enum in optimized mode, and the struct in debug
// mode. This way we get the compile-time error checking in debug mode
// and best performance in optimized code.
// -----------------------------------------------------------------------------
// Implementation of Register and FPURegister.
enum RegisterCode {
#define REGISTER_CODE(R) kRegCode_##R,
GENERAL_REGISTERS(REGISTER_CODE)
#undef REGISTER_CODE
kRegAfterLast
};
class Register : public RegisterBase<Register, kRegAfterLast> {
public:
static constexpr int kMantissaOffset = 0;
static constexpr int kExponentOffset = 4;
private:
friend class RegisterBase;
explicit constexpr Register(int code) : RegisterBase(code) {}
};
// s7: context register
// s3: scratch register
// s4: scratch register 2
#define DECLARE_REGISTER(R) \
constexpr Register R = Register::from_code(kRegCode_##R);
GENERAL_REGISTERS(DECLARE_REGISTER)
#undef DECLARE_REGISTER
constexpr Register no_reg = Register::no_reg();
int ToNumber(Register reg);
Register ToRegister(int num);
// Returns the number of padding slots needed for stack pointer alignment.
constexpr int ArgumentPaddingSlots(int argument_count) {
// No argument padding required.
return 0;
}
constexpr AliasingKind kFPAliasing = AliasingKind::kOverlap;
constexpr bool kSimdMaskRegisters = false;
enum DoubleRegisterCode {
#define REGISTER_CODE(R) kDoubleCode_##R,
DOUBLE_REGISTERS(REGISTER_CODE)
#undef REGISTER_CODE
kDoubleAfterLast
};
// FPURegister register.
class FPURegister : public RegisterBase<FPURegister, kDoubleAfterLast> {
public:
FPURegister low() const { return FPURegister::from_code(code()); }
private:
friend class RegisterBase;
explicit constexpr FPURegister(int code) : RegisterBase(code) {}
};
// Condition Flag Register
enum CFRegister { FCC0, FCC1, FCC2, FCC3, FCC4, FCC5, FCC6, FCC7 };
using FloatRegister = FPURegister;
using DoubleRegister = FPURegister;
using Simd128Register = FPURegister;
#define DECLARE_DOUBLE_REGISTER(R) \
constexpr DoubleRegister R = DoubleRegister::from_code(kDoubleCode_##R);
DOUBLE_REGISTERS(DECLARE_DOUBLE_REGISTER)
#undef DECLARE_DOUBLE_REGISTER
constexpr DoubleRegister no_dreg = DoubleRegister::no_reg();
// Register aliases.
// cp is assumed to be a callee saved register.
constexpr Register kRootRegister = s6;
constexpr Register cp = s7;
constexpr Register kScratchReg = s3;
constexpr Register kScratchReg2 = s4;
constexpr DoubleRegister kScratchDoubleReg = f30;
constexpr DoubleRegister kScratchDoubleReg1 = f30;
constexpr DoubleRegister kScratchDoubleReg2 = f31;
// FPU zero reg is often used to hold 0.0, but it's not hardwired to 0.0.
constexpr DoubleRegister kDoubleRegZero = f29;
struct FPUControlRegister {
bool is_valid() const { return (reg_code >> 2) == 0; }
bool is(FPUControlRegister creg) const { return reg_code == creg.reg_code; }
int code() const {
DCHECK(is_valid());
return reg_code;
}
int bit() const {
DCHECK(is_valid());
return 1 << reg_code;
}
void setcode(int f) {
reg_code = f;
DCHECK(is_valid());
}
// Unfortunately we can't make this private in a struct.
int reg_code;
};
constexpr FPUControlRegister no_fpucreg = {kInvalidFPUControlRegister};
constexpr FPUControlRegister FCSR = {kFCSRRegister};
constexpr FPUControlRegister FCSR0 = {kFCSRRegister};
constexpr FPUControlRegister FCSR1 = {kFCSRRegister + 1};
constexpr FPUControlRegister FCSR2 = {kFCSRRegister + 2};
constexpr FPUControlRegister FCSR3 = {kFCSRRegister + 3};
// Define {RegisterName} methods for the register types.
DEFINE_REGISTER_NAMES(Register, GENERAL_REGISTERS)
DEFINE_REGISTER_NAMES(FPURegister, DOUBLE_REGISTERS)
// Give alias names to registers for calling conventions.
constexpr Register kReturnRegister0 = a0;
constexpr Register kReturnRegister1 = a1;
constexpr Register kReturnRegister2 = a2;
constexpr Register kJSFunctionRegister = a1;
constexpr Register kContextRegister = s7;
constexpr Register kAllocateSizeRegister = a0;
constexpr Register kInterpreterAccumulatorRegister = a0;
constexpr Register kInterpreterBytecodeOffsetRegister = t0;
constexpr Register kInterpreterBytecodeArrayRegister = t1;
constexpr Register kInterpreterDispatchTableRegister = t2;
constexpr Register kJavaScriptCallArgCountRegister = a0;
constexpr Register kJavaScriptCallCodeStartRegister = a2;
constexpr Register kJavaScriptCallTargetRegister = kJSFunctionRegister;
constexpr Register kJavaScriptCallNewTargetRegister = a3;
constexpr Register kJavaScriptCallExtraArg1Register = a2;
constexpr Register kOffHeapTrampolineRegister = t7;
constexpr Register kRuntimeCallFunctionRegister = a1;
constexpr Register kRuntimeCallArgCountRegister = a0;
constexpr Register kRuntimeCallArgvRegister = a2;
constexpr Register kWasmInstanceRegister = a0;
constexpr Register kWasmCompileLazyFuncIndexRegister = t0;
constexpr DoubleRegister kFPReturnRegister0 = f0;
} // namespace internal
} // namespace v8
#endif // V8_CODEGEN_LOONG64_REGISTER_LOONG64_H_
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