mips.go

     1  // Copyright 2025 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package asmgen
     6  
     7  var ArchMIPS = &Arch{
     8  	Name:          "mipsx",
     9  	Build:         "mips || mipsle",
    10  	WordBits:      32,
    11  	WordBytes:     4,
    12  	CarrySafeLoop: true,
    13  
    14  	regs: []string{
    15  		// R0 is 0
    16  		// R23 is the assembler/linker temporary (which we use too).
    17  		// R24 and R25 are our virtual carry flags.
    18  		// R28 is SB.
    19  		// R29 is SP.
    20  		// R30 is g.
    21  		// R31 is LR.
    22  		"R1", "R2", "R3", "R4", "R5", "R6", "R7", "R8", "R9",
    23  		"R10", "R11", "R12", "R13", "R14", "R15", "R16", "R17", "R18", "R19",
    24  		"R20", "R21", "R22", "R24", "R25",
    25  	},
    26  	reg0:        "R0",
    27  	regTmp:      "R23",
    28  	regCarry:    "R24",
    29  	regAltCarry: "R25",
    30  
    31  	mov:      "MOVW",
    32  	add:      "ADDU",
    33  	sltu:     "SGTU", // SGTU args are swapped, so it's really SLTU
    34  	sub:      "SUBU",
    35  	mulWideF: mipsMulWide,
    36  	lsh:      "SLL",
    37  	rsh:      "SRL",
    38  	and:      "AND",
    39  	or:       "OR",
    40  	xor:      "XOR",
    41  
    42  	jmpZero:    "BEQ %s, %s",
    43  	jmpNonZero: "BNE %s, %s",
    44  }
    45  
    46  func mipsMulWide(a *Asm, src1, src2, dstlo, dsthi Reg) {
    47  	a.Printf("\tMULU %s, %s\n\tMOVW LO, %s\n\tMOVW HI, %s\n", src1, src2, dstlo, dsthi)
    48  }
    49
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