loong64.go

     1  // Copyright 2022 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  // This file encapsulates some of the odd characteristics of the
     6  // Loong64 (LoongArch64) instruction set, to minimize its interaction
     7  // with the core of the assembler.
     8  
     9  package arch
    10  
    11  import (
    12  	"cmd/internal/obj"
    13  	"cmd/internal/obj/loong64"
    14  )
    15  
    16  func jumpLoong64(word string) bool {
    17  	switch word {
    18  	case "BEQ", "BFPF", "BFPT", "BLTZ", "BGEZ", "BLEZ", "BGTZ", "BLT", "BLTU", "JIRL", "BNE", "BGE", "BGEU", "JMP", "JAL", "CALL":
    19  		return true
    20  	}
    21  	return false
    22  }
    23  
    24  // IsLoong64CMP reports whether the op (as defined by an loong64.A* constant) is
    25  // one of the CMP instructions that require special handling.
    26  func IsLoong64CMP(op obj.As) bool {
    27  	switch op {
    28  	case loong64.ACMPEQF, loong64.ACMPEQD, loong64.ACMPGEF, loong64.ACMPGED,
    29  		loong64.ACMPGTF, loong64.ACMPGTD:
    30  		return true
    31  	}
    32  	return false
    33  }
    34  
    35  // IsLoong64MUL reports whether the op (as defined by an loong64.A* constant) is
    36  // one of the MUL/DIV/REM instructions that require special handling.
    37  func IsLoong64MUL(op obj.As) bool {
    38  	switch op {
    39  	case loong64.AMUL, loong64.AMULU, loong64.AMULV, loong64.AMULVU,
    40  		loong64.ADIV, loong64.ADIVU, loong64.ADIVV, loong64.ADIVVU,
    41  		loong64.AREM, loong64.AREMU, loong64.AREMV, loong64.AREMVU:
    42  		return true
    43  	}
    44  	return false
    45  }
    46  
    47  // IsLoong64RDTIME reports whether the op (as defined by an loong64.A*
    48  // constant) is one of the RDTIMELW/RDTIMEHW/RDTIMED instructions that
    49  // require special handling.
    50  func IsLoong64RDTIME(op obj.As) bool {
    51  	switch op {
    52  	case loong64.ARDTIMELW, loong64.ARDTIMEHW, loong64.ARDTIMED:
    53  		return true
    54  	}
    55  	return false
    56  }
    57  
    58  func loong64RegisterNumber(name string, n int16) (int16, bool) {
    59  	switch name {
    60  	case "F":
    61  		if 0 <= n && n <= 31 {
    62  			return loong64.REG_F0 + n, true
    63  		}
    64  	case "FCSR":
    65  		if 0 <= n && n <= 31 {
    66  			return loong64.REG_FCSR0 + n, true
    67  		}
    68  	case "FCC":
    69  		if 0 <= n && n <= 31 {
    70  			return loong64.REG_FCC0 + n, true
    71  		}
    72  	case "R":
    73  		if 0 <= n && n <= 31 {
    74  			return loong64.REG_R0 + n, true
    75  		}
    76  	}
    77  	return 0, false
    78  }
    79
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