riscv64.go

     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  	"cmd/internal/obj"
    13  	"cmd/internal/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
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