riscv64.go raw

   1  // Copyright 2020 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 RISCV64
   6  // instruction set, to minimize its interaction with the core of the
   7  // assembler.
   8  
   9  package arch
  10  
  11  import (
  12  	"github.com/twitchyliquid64/golang-asm/obj"
  13  	"github.com/twitchyliquid64/golang-asm/obj/riscv"
  14  )
  15  
  16  // IsRISCV64AMO reports whether the op (as defined by a riscv.A*
  17  // constant) is one of the AMO instructions that requires special
  18  // handling.
  19  func IsRISCV64AMO(op obj.As) bool {
  20  	switch op {
  21  	case riscv.ASCW, riscv.ASCD, riscv.AAMOSWAPW, riscv.AAMOSWAPD, riscv.AAMOADDW, riscv.AAMOADDD,
  22  		riscv.AAMOANDW, riscv.AAMOANDD, riscv.AAMOORW, riscv.AAMOORD, riscv.AAMOXORW, riscv.AAMOXORD,
  23  		riscv.AAMOMINW, riscv.AAMOMIND, riscv.AAMOMINUW, riscv.AAMOMINUD,
  24  		riscv.AAMOMAXW, riscv.AAMOMAXD, riscv.AAMOMAXUW, riscv.AAMOMAXUD:
  25  		return true
  26  	}
  27  	return false
  28  }
  29