// 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 { 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 { 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_