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Current File : /opt/golang/1.22.0/src/cmd/compile/internal/ssa/_gen/RISCV64Ops.go
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

import (
	"fmt"
)

// Notes:
//  - Boolean types occupy the entire register. 0=false, 1=true.

// Suffixes encode the bit width of various instructions:
//
// D (double word) = 64 bit int
// W (word)        = 32 bit int
// H (half word)   = 16 bit int
// B (byte)        = 8 bit int
// S (single)      = 32 bit float
// D (double)      = 64 bit float
// L               = 64 bit int, used when the opcode starts with F

const (
	riscv64REG_G    = 27
	riscv64REG_CTXT = 26
	riscv64REG_LR   = 1
	riscv64REG_SP   = 2
	riscv64REG_GP   = 3
	riscv64REG_TP   = 4
	riscv64REG_TMP  = 31
	riscv64REG_ZERO = 0
)

func riscv64RegName(r int) string {
	switch {
	case r == riscv64REG_G:
		return "g"
	case r == riscv64REG_SP:
		return "SP"
	case 0 <= r && r <= 31:
		return fmt.Sprintf("X%d", r)
	case 32 <= r && r <= 63:
		return fmt.Sprintf("F%d", r-32)
	default:
		panic(fmt.Sprintf("unknown register %d", r))
	}
}

func init() {
	var regNamesRISCV64 []string
	var gpMask, fpMask, gpgMask, gpspMask, gpspsbMask, gpspsbgMask regMask
	regNamed := make(map[string]regMask)

	// Build the list of register names, creating an appropriately indexed
	// regMask for the gp and fp registers as we go.
	//
	// If name is specified, use it rather than the riscv reg number.
	addreg := func(r int, name string) regMask {
		mask := regMask(1) << uint(len(regNamesRISCV64))
		if name == "" {
			name = riscv64RegName(r)
		}
		regNamesRISCV64 = append(regNamesRISCV64, name)
		regNamed[name] = mask
		return mask
	}

	// General purpose registers.
	for r := 0; r <= 31; r++ {
		if r == riscv64REG_LR {
			// LR is not used by regalloc, so we skip it to leave
			// room for pseudo-register SB.
			continue
		}

		mask := addreg(r, "")

		// Add general purpose registers to gpMask.
		switch r {
		// ZERO, GP, TP and TMP are not in any gp mask.
		case riscv64REG_ZERO, riscv64REG_GP, riscv64REG_TP, riscv64REG_TMP:
		case riscv64REG_G:
			gpgMask |= mask
			gpspsbgMask |= mask
		case riscv64REG_SP:
			gpspMask |= mask
			gpspsbMask |= mask
			gpspsbgMask |= mask
		default:
			gpMask |= mask
			gpgMask |= mask
			gpspMask |= mask
			gpspsbMask |= mask
			gpspsbgMask |= mask
		}
	}

	// Floating pointer registers.
	for r := 32; r <= 63; r++ {
		mask := addreg(r, "")
		fpMask |= mask
	}

	// Pseudo-register: SB
	mask := addreg(-1, "SB")
	gpspsbMask |= mask
	gpspsbgMask |= mask

	if len(regNamesRISCV64) > 64 {
		// regMask is only 64 bits.
		panic("Too many RISCV64 registers")
	}

	regCtxt := regNamed["X26"]
	callerSave := gpMask | fpMask | regNamed["g"]

	var (
		gpstore  = regInfo{inputs: []regMask{gpspsbMask, gpspMask, 0}} // SB in first input so we can load from a global, but not in second to avoid using SB as a temporary register
		gpstore0 = regInfo{inputs: []regMask{gpspsbMask}}
		gp01     = regInfo{outputs: []regMask{gpMask}}
		gp11     = regInfo{inputs: []regMask{gpMask}, outputs: []regMask{gpMask}}
		gp21     = regInfo{inputs: []regMask{gpMask, gpMask}, outputs: []regMask{gpMask}}
		gp22     = regInfo{inputs: []regMask{gpMask, gpMask}, outputs: []regMask{gpMask, gpMask}}
		gpload   = regInfo{inputs: []regMask{gpspsbMask, 0}, outputs: []regMask{gpMask}}
		gp11sb   = regInfo{inputs: []regMask{gpspsbMask}, outputs: []regMask{gpMask}}
		gpxchg   = regInfo{inputs: []regMask{gpspsbgMask, gpgMask}, outputs: []regMask{gpMask}}
		gpcas    = regInfo{inputs: []regMask{gpspsbgMask, gpgMask, gpgMask}, outputs: []regMask{gpMask}}
		gpatomic = regInfo{inputs: []regMask{gpspsbgMask, gpgMask}}

		fp11    = regInfo{inputs: []regMask{fpMask}, outputs: []regMask{fpMask}}
		fp21    = regInfo{inputs: []regMask{fpMask, fpMask}, outputs: []regMask{fpMask}}
		fp31    = regInfo{inputs: []regMask{fpMask, fpMask, fpMask}, outputs: []regMask{fpMask}}
		gpfp    = regInfo{inputs: []regMask{gpMask}, outputs: []regMask{fpMask}}
		fpgp    = regInfo{inputs: []regMask{fpMask}, outputs: []regMask{gpMask}}
		fpstore = regInfo{inputs: []regMask{gpspsbMask, fpMask, 0}}
		fpload  = regInfo{inputs: []regMask{gpspsbMask, 0}, outputs: []regMask{fpMask}}
		fp2gp   = regInfo{inputs: []regMask{fpMask, fpMask}, outputs: []regMask{gpMask}}

		call        = regInfo{clobbers: callerSave}
		callClosure = regInfo{inputs: []regMask{gpspMask, regCtxt, 0}, clobbers: callerSave}
		callInter   = regInfo{inputs: []regMask{gpMask}, clobbers: callerSave}
	)

	RISCV64ops := []opData{
		{name: "ADD", argLength: 2, reg: gp21, asm: "ADD", commutative: true}, // arg0 + arg1
		{name: "ADDI", argLength: 1, reg: gp11sb, asm: "ADDI", aux: "Int64"},  // arg0 + auxint
		{name: "ADDIW", argLength: 1, reg: gp11, asm: "ADDIW", aux: "Int64"},  // 32 low bits of arg0 + auxint, sign extended to 64 bits
		{name: "NEG", argLength: 1, reg: gp11, asm: "NEG"},                    // -arg0
		{name: "NEGW", argLength: 1, reg: gp11, asm: "NEGW"},                  // -arg0 of 32 bits, sign extended to 64 bits
		{name: "SUB", argLength: 2, reg: gp21, asm: "SUB"},                    // arg0 - arg1
		{name: "SUBW", argLength: 2, reg: gp21, asm: "SUBW"},                  // 32 low bits of arg 0 - 32 low bits of arg 1, sign extended to 64 bits

		// M extension. H means high (i.e., it returns the top bits of
		// the result). U means unsigned. W means word (i.e., 32-bit).
		{name: "MUL", argLength: 2, reg: gp21, asm: "MUL", commutative: true, typ: "Int64"}, // arg0 * arg1
		{name: "MULW", argLength: 2, reg: gp21, asm: "MULW", commutative: true, typ: "Int32"},
		{name: "MULH", argLength: 2, reg: gp21, asm: "MULH", commutative: true, typ: "Int64"},
		{name: "MULHU", argLength: 2, reg: gp21, asm: "MULHU", commutative: true, typ: "UInt64"},
		{name: "LoweredMuluhilo", argLength: 2, reg: gp22, resultNotInArgs: true}, // arg0 * arg1, return (hi, lo)
		{name: "LoweredMuluover", argLength: 2, reg: gp22, resultNotInArgs: true}, // arg0 * arg1, return (64 bits of arg0*arg1, overflow)

		{name: "DIV", argLength: 2, reg: gp21, asm: "DIV", typ: "Int64"}, // arg0 / arg1
		{name: "DIVU", argLength: 2, reg: gp21, asm: "DIVU", typ: "UInt64"},
		{name: "DIVW", argLength: 2, reg: gp21, asm: "DIVW", typ: "Int32"},
		{name: "DIVUW", argLength: 2, reg: gp21, asm: "DIVUW", typ: "UInt32"},
		{name: "REM", argLength: 2, reg: gp21, asm: "REM", typ: "Int64"}, // arg0 % arg1
		{name: "REMU", argLength: 2, reg: gp21, asm: "REMU", typ: "UInt64"},
		{name: "REMW", argLength: 2, reg: gp21, asm: "REMW", typ: "Int32"},
		{name: "REMUW", argLength: 2, reg: gp21, asm: "REMUW", typ: "UInt32"},

		{name: "MOVaddr", argLength: 1, reg: gp11sb, asm: "MOV", aux: "SymOff", rematerializeable: true, symEffect: "Addr"}, // arg0 + auxint + offset encoded in aux
		// auxint+aux == add auxint and the offset of the symbol in aux (if any) to the effective address

		{name: "MOVDconst", reg: gp01, asm: "MOV", typ: "UInt64", aux: "Int64", rematerializeable: true}, // auxint

		// Loads: load <size> bits from arg0+auxint+aux and extend to 64 bits; arg1=mem
		{name: "MOVBload", argLength: 2, reg: gpload, asm: "MOVB", aux: "SymOff", typ: "Int8", faultOnNilArg0: true, symEffect: "Read"},     //  8 bits, sign extend
		{name: "MOVHload", argLength: 2, reg: gpload, asm: "MOVH", aux: "SymOff", typ: "Int16", faultOnNilArg0: true, symEffect: "Read"},    // 16 bits, sign extend
		{name: "MOVWload", argLength: 2, reg: gpload, asm: "MOVW", aux: "SymOff", typ: "Int32", faultOnNilArg0: true, symEffect: "Read"},    // 32 bits, sign extend
		{name: "MOVDload", argLength: 2, reg: gpload, asm: "MOV", aux: "SymOff", typ: "Int64", faultOnNilArg0: true, symEffect: "Read"},     // 64 bits
		{name: "MOVBUload", argLength: 2, reg: gpload, asm: "MOVBU", aux: "SymOff", typ: "UInt8", faultOnNilArg0: true, symEffect: "Read"},  //  8 bits, zero extend
		{name: "MOVHUload", argLength: 2, reg: gpload, asm: "MOVHU", aux: "SymOff", typ: "UInt16", faultOnNilArg0: true, symEffect: "Read"}, // 16 bits, zero extend
		{name: "MOVWUload", argLength: 2, reg: gpload, asm: "MOVWU", aux: "SymOff", typ: "UInt32", faultOnNilArg0: true, symEffect: "Read"}, // 32 bits, zero extend

		// Stores: store <size> lowest bits in arg1 to arg0+auxint+aux; arg2=mem
		{name: "MOVBstore", argLength: 3, reg: gpstore, asm: "MOVB", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"}, //  8 bits
		{name: "MOVHstore", argLength: 3, reg: gpstore, asm: "MOVH", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"}, // 16 bits
		{name: "MOVWstore", argLength: 3, reg: gpstore, asm: "MOVW", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"}, // 32 bits
		{name: "MOVDstore", argLength: 3, reg: gpstore, asm: "MOV", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},  // 64 bits

		// Stores: store <size> of zero in arg0+auxint+aux; arg1=mem
		{name: "MOVBstorezero", argLength: 2, reg: gpstore0, aux: "SymOff", asm: "MOVB", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"}, //  8 bits
		{name: "MOVHstorezero", argLength: 2, reg: gpstore0, aux: "SymOff", asm: "MOVH", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"}, // 16 bits
		{name: "MOVWstorezero", argLength: 2, reg: gpstore0, aux: "SymOff", asm: "MOVW", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"}, // 32 bits
		{name: "MOVDstorezero", argLength: 2, reg: gpstore0, aux: "SymOff", asm: "MOV", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},  // 64 bits

		// Conversions
		{name: "MOVBreg", argLength: 1, reg: gp11, asm: "MOVB"},   // move from arg0, sign-extended from byte
		{name: "MOVHreg", argLength: 1, reg: gp11, asm: "MOVH"},   // move from arg0, sign-extended from half
		{name: "MOVWreg", argLength: 1, reg: gp11, asm: "MOVW"},   // move from arg0, sign-extended from word
		{name: "MOVDreg", argLength: 1, reg: gp11, asm: "MOV"},    // move from arg0
		{name: "MOVBUreg", argLength: 1, reg: gp11, asm: "MOVBU"}, // move from arg0, unsign-extended from byte
		{name: "MOVHUreg", argLength: 1, reg: gp11, asm: "MOVHU"}, // move from arg0, unsign-extended from half
		{name: "MOVWUreg", argLength: 1, reg: gp11, asm: "MOVWU"}, // move from arg0, unsign-extended from word

		{name: "MOVDnop", argLength: 1, reg: regInfo{inputs: []regMask{gpMask}, outputs: []regMask{gpMask}}, resultInArg0: true}, // nop, return arg0 in same register

		// Shift ops
		{name: "SLL", argLength: 2, reg: gp21, asm: "SLL"},                   // arg0 << (aux1 & 63)
		{name: "SRA", argLength: 2, reg: gp21, asm: "SRA"},                   // arg0 >> (aux1 & 63), signed
		{name: "SRAW", argLength: 2, reg: gp21, asm: "SRAW"},                 // arg0 >> (aux1 & 31), signed
		{name: "SRL", argLength: 2, reg: gp21, asm: "SRL"},                   // arg0 >> (aux1 & 63), unsigned
		{name: "SRLW", argLength: 2, reg: gp21, asm: "SRLW"},                 // arg0 >> (aux1 & 31), unsigned
		{name: "SLLI", argLength: 1, reg: gp11, asm: "SLLI", aux: "Int64"},   // arg0 << auxint, shift amount 0-63
		{name: "SRAI", argLength: 1, reg: gp11, asm: "SRAI", aux: "Int64"},   // arg0 >> auxint, signed, shift amount 0-63
		{name: "SRAIW", argLength: 1, reg: gp11, asm: "SRAIW", aux: "Int64"}, // arg0 >> auxint, signed, shift amount 0-31
		{name: "SRLI", argLength: 1, reg: gp11, asm: "SRLI", aux: "Int64"},   // arg0 >> auxint, unsigned, shift amount 0-63
		{name: "SRLIW", argLength: 1, reg: gp11, asm: "SRLIW", aux: "Int64"}, // arg0 >> auxint, unsigned, shift amount 0-31

		// Bitwise ops
		{name: "XOR", argLength: 2, reg: gp21, asm: "XOR", commutative: true}, // arg0 ^ arg1
		{name: "XORI", argLength: 1, reg: gp11, asm: "XORI", aux: "Int64"},    // arg0 ^ auxint
		{name: "OR", argLength: 2, reg: gp21, asm: "OR", commutative: true},   // arg0 | arg1
		{name: "ORI", argLength: 1, reg: gp11, asm: "ORI", aux: "Int64"},      // arg0 | auxint
		{name: "AND", argLength: 2, reg: gp21, asm: "AND", commutative: true}, // arg0 & arg1
		{name: "ANDI", argLength: 1, reg: gp11, asm: "ANDI", aux: "Int64"},    // arg0 & auxint
		{name: "NOT", argLength: 1, reg: gp11, asm: "NOT"},                    // ^arg0

		// Generate boolean values
		{name: "SEQZ", argLength: 1, reg: gp11, asm: "SEQZ"},                 // arg0 == 0, result is 0 or 1
		{name: "SNEZ", argLength: 1, reg: gp11, asm: "SNEZ"},                 // arg0 != 0, result is 0 or 1
		{name: "SLT", argLength: 2, reg: gp21, asm: "SLT"},                   // arg0 < arg1, result is 0 or 1
		{name: "SLTI", argLength: 1, reg: gp11, asm: "SLTI", aux: "Int64"},   // arg0 < auxint, result is 0 or 1
		{name: "SLTU", argLength: 2, reg: gp21, asm: "SLTU"},                 // arg0 < arg1, unsigned, result is 0 or 1
		{name: "SLTIU", argLength: 1, reg: gp11, asm: "SLTIU", aux: "Int64"}, // arg0 < auxint, unsigned, result is 0 or 1

		// Round ops to block fused-multiply-add extraction.
		{name: "LoweredRound32F", argLength: 1, reg: fp11, resultInArg0: true},
		{name: "LoweredRound64F", argLength: 1, reg: fp11, resultInArg0: true},

		// Calls
		{name: "CALLstatic", argLength: -1, reg: call, aux: "CallOff", call: true},               // call static function aux.(*gc.Sym). last arg=mem, auxint=argsize, returns mem
		{name: "CALLtail", argLength: -1, reg: call, aux: "CallOff", call: true, tailCall: true}, // tail call static function aux.(*gc.Sym). last arg=mem, auxint=argsize, returns mem
		{name: "CALLclosure", argLength: -1, reg: callClosure, aux: "CallOff", call: true},       // call function via closure. arg0=codeptr, arg1=closure, last arg=mem, auxint=argsize, returns mem
		{name: "CALLinter", argLength: -1, reg: callInter, aux: "CallOff", call: true},           // call fn by pointer. arg0=codeptr, last arg=mem, auxint=argsize, returns mem

		// duffzero
		// arg0 = address of memory to zero (in X25, changed as side effect)
		// arg1 = mem
		// auxint = offset into duffzero code to start executing
		// X1 (link register) changed because of function call
		// returns mem
		{
			name:      "DUFFZERO",
			aux:       "Int64",
			argLength: 2,
			reg: regInfo{
				inputs:   []regMask{regNamed["X25"]},
				clobbers: regNamed["X1"] | regNamed["X25"],
			},
			typ:            "Mem",
			faultOnNilArg0: true,
		},

		// duffcopy
		// arg0 = address of dst memory (in X25, changed as side effect)
		// arg1 = address of src memory (in X24, changed as side effect)
		// arg2 = mem
		// auxint = offset into duffcopy code to start executing
		// X1 (link register) changed because of function call
		// returns mem
		{
			name:      "DUFFCOPY",
			aux:       "Int64",
			argLength: 3,
			reg: regInfo{
				inputs:   []regMask{regNamed["X25"], regNamed["X24"]},
				clobbers: regNamed["X1"] | regNamed["X24"] | regNamed["X25"],
			},
			typ:            "Mem",
			faultOnNilArg0: true,
			faultOnNilArg1: true,
		},

		// Generic moves and zeros

		// general unaligned zeroing
		// arg0 = address of memory to zero (in X5, changed as side effect)
		// arg1 = address of the last element to zero (inclusive)
		// arg2 = mem
		// auxint = element size
		// returns mem
		//	mov	ZERO, (X5)
		//	ADD	$sz, X5
		//	BGEU	Rarg1, X5, -2(PC)
		{
			name:      "LoweredZero",
			aux:       "Int64",
			argLength: 3,
			reg: regInfo{
				inputs:   []regMask{regNamed["X5"], gpMask},
				clobbers: regNamed["X5"],
			},
			typ:            "Mem",
			faultOnNilArg0: true,
		},

		// general unaligned move
		// arg0 = address of dst memory (in X5, changed as side effect)
		// arg1 = address of src memory (in X6, changed as side effect)
		// arg2 = address of the last element of src (can't be X7 as we clobber it before using arg2)
		// arg3 = mem
		// auxint = alignment
		// clobbers X7 as a tmp register.
		// returns mem
		//	mov	(X6), X7
		//	mov	X7, (X5)
		//	ADD	$sz, X5
		//	ADD	$sz, X6
		//	BGEU	Rarg2, X5, -4(PC)
		{
			name:      "LoweredMove",
			aux:       "Int64",
			argLength: 4,
			reg: regInfo{
				inputs:   []regMask{regNamed["X5"], regNamed["X6"], gpMask &^ regNamed["X7"]},
				clobbers: regNamed["X5"] | regNamed["X6"] | regNamed["X7"],
			},
			typ:            "Mem",
			faultOnNilArg0: true,
			faultOnNilArg1: true,
		},

		// Atomic loads.
		// load from arg0. arg1=mem.
		// returns <value,memory> so they can be properly ordered with other loads.
		{name: "LoweredAtomicLoad8", argLength: 2, reg: gpload, faultOnNilArg0: true},
		{name: "LoweredAtomicLoad32", argLength: 2, reg: gpload, faultOnNilArg0: true},
		{name: "LoweredAtomicLoad64", argLength: 2, reg: gpload, faultOnNilArg0: true},

		// Atomic stores.
		// store arg1 to *arg0. arg2=mem. returns memory.
		{name: "LoweredAtomicStore8", argLength: 3, reg: gpstore, faultOnNilArg0: true, hasSideEffects: true},
		{name: "LoweredAtomicStore32", argLength: 3, reg: gpstore, faultOnNilArg0: true, hasSideEffects: true},
		{name: "LoweredAtomicStore64", argLength: 3, reg: gpstore, faultOnNilArg0: true, hasSideEffects: true},

		// Atomic exchange.
		// store arg1 to *arg0. arg2=mem. returns <old content of *arg0, memory>.
		{name: "LoweredAtomicExchange32", argLength: 3, reg: gpxchg, resultNotInArgs: true, faultOnNilArg0: true, hasSideEffects: true},
		{name: "LoweredAtomicExchange64", argLength: 3, reg: gpxchg, resultNotInArgs: true, faultOnNilArg0: true, hasSideEffects: true},

		// Atomic add.
		// *arg0 += arg1. arg2=mem. returns <new content of *arg0, memory>.
		{name: "LoweredAtomicAdd32", argLength: 3, reg: gpxchg, resultNotInArgs: true, faultOnNilArg0: true, hasSideEffects: true, unsafePoint: true},
		{name: "LoweredAtomicAdd64", argLength: 3, reg: gpxchg, resultNotInArgs: true, faultOnNilArg0: true, hasSideEffects: true, unsafePoint: true},

		// Atomic compare and swap.
		// arg0 = pointer, arg1 = old value, arg2 = new value, arg3 = memory.
		// if *arg0 == arg1 {
		//   *arg0 = arg2
		//   return (true, memory)
		// } else {
		//   return (false, memory)
		// }
		// MOV  $0, Rout
		// LR	(Rarg0), Rtmp
		// BNE	Rtmp, Rarg1, 3(PC)
		// SC	Rarg2, (Rarg0), Rtmp
		// BNE	Rtmp, ZERO, -3(PC)
		// MOV  $1, Rout
		{name: "LoweredAtomicCas32", argLength: 4, reg: gpcas, resultNotInArgs: true, faultOnNilArg0: true, hasSideEffects: true, unsafePoint: true},
		{name: "LoweredAtomicCas64", argLength: 4, reg: gpcas, resultNotInArgs: true, faultOnNilArg0: true, hasSideEffects: true, unsafePoint: true},

		// Atomic 32 bit AND/OR.
		// *arg0 &= (|=) arg1. arg2=mem. returns nil.
		{name: "LoweredAtomicAnd32", argLength: 3, reg: gpatomic, asm: "AMOANDW", faultOnNilArg0: true, hasSideEffects: true},
		{name: "LoweredAtomicOr32", argLength: 3, reg: gpatomic, asm: "AMOORW", faultOnNilArg0: true, hasSideEffects: true},

		// Lowering pass-throughs
		{name: "LoweredNilCheck", argLength: 2, faultOnNilArg0: true, nilCheck: true, reg: regInfo{inputs: []regMask{gpspMask}}}, // arg0=ptr,arg1=mem, returns void.  Faults if ptr is nil.
		{name: "LoweredGetClosurePtr", reg: regInfo{outputs: []regMask{regCtxt}}},                                                // scheduler ensures only at beginning of entry block

		// LoweredGetCallerSP returns the SP of the caller of the current function. arg0=mem.
		{name: "LoweredGetCallerSP", argLength: 1, reg: gp01, rematerializeable: true},

		// LoweredGetCallerPC evaluates to the PC to which its "caller" will return.
		// I.e., if f calls g "calls" getcallerpc,
		// the result should be the PC within f that g will return to.
		// See runtime/stubs.go for a more detailed discussion.
		{name: "LoweredGetCallerPC", reg: gp01, rematerializeable: true},

		// LoweredWB invokes runtime.gcWriteBarrier. arg0=mem, auxint=# of buffer entries needed
		// It saves all GP registers if necessary,
		// but clobbers RA (LR) because it's a call
		// and T6 (REG_TMP).
		// Returns a pointer to a write barrier buffer in X24.
		{name: "LoweredWB", argLength: 1, reg: regInfo{clobbers: (callerSave &^ (gpMask | regNamed["g"])) | regNamed["X1"], outputs: []regMask{regNamed["X24"]}}, clobberFlags: true, aux: "Int64"},

		// Do data barrier. arg0=memorys
		{name: "LoweredPubBarrier", argLength: 1, asm: "FENCE", hasSideEffects: true},

		// There are three of these functions so that they can have three different register inputs.
		// When we check 0 <= c <= cap (A), then 0 <= b <= c (B), then 0 <= a <= b (C), we want the
		// default registers to match so we don't need to copy registers around unnecessarily.
		{name: "LoweredPanicBoundsA", argLength: 3, aux: "Int64", reg: regInfo{inputs: []regMask{regNamed["X7"], regNamed["X28"]}}, typ: "Mem", call: true}, // arg0=idx, arg1=len, arg2=mem, returns memory. AuxInt contains report code (see PanicBounds in genericOps.go).
		{name: "LoweredPanicBoundsB", argLength: 3, aux: "Int64", reg: regInfo{inputs: []regMask{regNamed["X6"], regNamed["X7"]}}, typ: "Mem", call: true},  // arg0=idx, arg1=len, arg2=mem, returns memory. AuxInt contains report code (see PanicBounds in genericOps.go).
		{name: "LoweredPanicBoundsC", argLength: 3, aux: "Int64", reg: regInfo{inputs: []regMask{regNamed["X5"], regNamed["X6"]}}, typ: "Mem", call: true},  // arg0=idx, arg1=len, arg2=mem, returns memory. AuxInt contains report code (see PanicBounds in genericOps.go).

		// F extension.
		{name: "FADDS", argLength: 2, reg: fp21, asm: "FADDS", commutative: true, typ: "Float32"},                                           // arg0 + arg1
		{name: "FSUBS", argLength: 2, reg: fp21, asm: "FSUBS", commutative: false, typ: "Float32"},                                          // arg0 - arg1
		{name: "FMULS", argLength: 2, reg: fp21, asm: "FMULS", commutative: true, typ: "Float32"},                                           // arg0 * arg1
		{name: "FDIVS", argLength: 2, reg: fp21, asm: "FDIVS", commutative: false, typ: "Float32"},                                          // arg0 / arg1
		{name: "FMADDS", argLength: 3, reg: fp31, asm: "FMADDS", commutative: true, typ: "Float32"},                                         // (arg0 * arg1) + arg2
		{name: "FMSUBS", argLength: 3, reg: fp31, asm: "FMSUBS", commutative: true, typ: "Float32"},                                         // (arg0 * arg1) - arg2
		{name: "FNMADDS", argLength: 3, reg: fp31, asm: "FNMADDS", commutative: true, typ: "Float32"},                                       // -(arg0 * arg1) + arg2
		{name: "FNMSUBS", argLength: 3, reg: fp31, asm: "FNMSUBS", commutative: true, typ: "Float32"},                                       // -(arg0 * arg1) - arg2
		{name: "FSQRTS", argLength: 1, reg: fp11, asm: "FSQRTS", typ: "Float32"},                                                            // sqrt(arg0)
		{name: "FNEGS", argLength: 1, reg: fp11, asm: "FNEGS", typ: "Float32"},                                                              // -arg0
		{name: "FMVSX", argLength: 1, reg: gpfp, asm: "FMVSX", typ: "Float32"},                                                              // reinterpret arg0 as float
		{name: "FCVTSW", argLength: 1, reg: gpfp, asm: "FCVTSW", typ: "Float32"},                                                            // float32(low 32 bits of arg0)
		{name: "FCVTSL", argLength: 1, reg: gpfp, asm: "FCVTSL", typ: "Float32"},                                                            // float32(arg0)
		{name: "FCVTWS", argLength: 1, reg: fpgp, asm: "FCVTWS", typ: "Int32"},                                                              // int32(arg0)
		{name: "FCVTLS", argLength: 1, reg: fpgp, asm: "FCVTLS", typ: "Int64"},                                                              // int64(arg0)
		{name: "FMOVWload", argLength: 2, reg: fpload, asm: "MOVF", aux: "SymOff", typ: "Float32", faultOnNilArg0: true, symEffect: "Read"}, // load float32 from arg0+auxint+aux
		{name: "FMOVWstore", argLength: 3, reg: fpstore, asm: "MOVF", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},  // store float32 to arg0+auxint+aux
		{name: "FEQS", argLength: 2, reg: fp2gp, asm: "FEQS", commutative: true},                                                            // arg0 == arg1
		{name: "FNES", argLength: 2, reg: fp2gp, asm: "FNES", commutative: true},                                                            // arg0 != arg1
		{name: "FLTS", argLength: 2, reg: fp2gp, asm: "FLTS"},                                                                               // arg0 < arg1
		{name: "FLES", argLength: 2, reg: fp2gp, asm: "FLES"},                                                                               // arg0 <= arg1

		// D extension.
		{name: "FADDD", argLength: 2, reg: fp21, asm: "FADDD", commutative: true, typ: "Float64"},                                           // arg0 + arg1
		{name: "FSUBD", argLength: 2, reg: fp21, asm: "FSUBD", commutative: false, typ: "Float64"},                                          // arg0 - arg1
		{name: "FMULD", argLength: 2, reg: fp21, asm: "FMULD", commutative: true, typ: "Float64"},                                           // arg0 * arg1
		{name: "FDIVD", argLength: 2, reg: fp21, asm: "FDIVD", commutative: false, typ: "Float64"},                                          // arg0 / arg1
		{name: "FMADDD", argLength: 3, reg: fp31, asm: "FMADDD", commutative: true, typ: "Float64"},                                         // (arg0 * arg1) + arg2
		{name: "FMSUBD", argLength: 3, reg: fp31, asm: "FMSUBD", commutative: true, typ: "Float64"},                                         // (arg0 * arg1) - arg2
		{name: "FNMADDD", argLength: 3, reg: fp31, asm: "FNMADDD", commutative: true, typ: "Float64"},                                       // -(arg0 * arg1) + arg2
		{name: "FNMSUBD", argLength: 3, reg: fp31, asm: "FNMSUBD", commutative: true, typ: "Float64"},                                       // -(arg0 * arg1) - arg2
		{name: "FSQRTD", argLength: 1, reg: fp11, asm: "FSQRTD", typ: "Float64"},                                                            // sqrt(arg0)
		{name: "FNEGD", argLength: 1, reg: fp11, asm: "FNEGD", typ: "Float64"},                                                              // -arg0
		{name: "FABSD", argLength: 1, reg: fp11, asm: "FABSD", typ: "Float64"},                                                              // abs(arg0)
		{name: "FSGNJD", argLength: 2, reg: fp21, asm: "FSGNJD", typ: "Float64"},                                                            // copy sign of arg1 to arg0
		{name: "FMVDX", argLength: 1, reg: gpfp, asm: "FMVDX", typ: "Float64"},                                                              // reinterpret arg0 as float
		{name: "FCVTDW", argLength: 1, reg: gpfp, asm: "FCVTDW", typ: "Float64"},                                                            // float64(low 32 bits of arg0)
		{name: "FCVTDL", argLength: 1, reg: gpfp, asm: "FCVTDL", typ: "Float64"},                                                            // float64(arg0)
		{name: "FCVTWD", argLength: 1, reg: fpgp, asm: "FCVTWD", typ: "Int32"},                                                              // int32(arg0)
		{name: "FCVTLD", argLength: 1, reg: fpgp, asm: "FCVTLD", typ: "Int64"},                                                              // int64(arg0)
		{name: "FCVTDS", argLength: 1, reg: fp11, asm: "FCVTDS", typ: "Float64"},                                                            // float64(arg0)
		{name: "FCVTSD", argLength: 1, reg: fp11, asm: "FCVTSD", typ: "Float32"},                                                            // float32(arg0)
		{name: "FMOVDload", argLength: 2, reg: fpload, asm: "MOVD", aux: "SymOff", typ: "Float64", faultOnNilArg0: true, symEffect: "Read"}, // load float64 from arg0+auxint+aux
		{name: "FMOVDstore", argLength: 3, reg: fpstore, asm: "MOVD", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},  // store float6 to arg0+auxint+aux
		{name: "FEQD", argLength: 2, reg: fp2gp, asm: "FEQD", commutative: true},                                                            // arg0 == arg1
		{name: "FNED", argLength: 2, reg: fp2gp, asm: "FNED", commutative: true},                                                            // arg0 != arg1
		{name: "FLTD", argLength: 2, reg: fp2gp, asm: "FLTD"},                                                                               // arg0 < arg1
		{name: "FLED", argLength: 2, reg: fp2gp, asm: "FLED"},                                                                               // arg0 <= arg1
	}

	RISCV64blocks := []blockData{
		{name: "BEQ", controls: 2},
		{name: "BNE", controls: 2},
		{name: "BLT", controls: 2},
		{name: "BGE", controls: 2},
		{name: "BLTU", controls: 2},
		{name: "BGEU", controls: 2},

		{name: "BEQZ", controls: 1},
		{name: "BNEZ", controls: 1},
		{name: "BLEZ", controls: 1},
		{name: "BGEZ", controls: 1},
		{name: "BLTZ", controls: 1},
		{name: "BGTZ", controls: 1},
	}

	archs = append(archs, arch{
		name:            "RISCV64",
		pkg:             "cmd/internal/obj/riscv",
		genfile:         "../../riscv64/ssa.go",
		ops:             RISCV64ops,
		blocks:          RISCV64blocks,
		regnames:        regNamesRISCV64,
		gpregmask:       gpMask,
		fpregmask:       fpMask,
		framepointerreg: -1, // not used
		// Integer parameters passed in register X10-X17, X8-X9, X18-X23
		ParamIntRegNames: "X10 X11 X12 X13 X14 X15 X16 X17 X8 X9 X18 X19 X20 X21 X22 X23",
		// Float parameters passed in register F10-F17, F8-F9, F18-F23
		ParamFloatRegNames: "F10 F11 F12 F13 F14 F15 F16 F17 F8 F9 F18 F19 F20 F21 F22 F23",
	})
}

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