go mips 源码
golang mips 代码
文件路径：/src/cmd/asm/internal/arch/mips.go
// Copyright 2015 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.
// This file encapsulates some of the odd characteristics of the
// MIPS (MIPS64) instruction set, to minimize its interaction
// with the core of the assembler.
package arch
import (
"cmd/internal/obj"
"cmd/internal/obj/mips"
)
func jumpMIPS(word string) bool {
switch word {
case "BEQ", "BFPF", "BFPT", "BGEZ", "BGEZAL", "BGTZ", "BLEZ", "BLTZ", "BLTZAL", "BNE", "JMP", "JAL", "CALL":
return true
}
return false
}
// IsMIPSCMP reports whether the op (as defined by an mips.A* constant) is
// one of the CMP instructions that require special handling.
func IsMIPSCMP(op obj.As) bool {
switch op {
case mips.ACMPEQF, mips.ACMPEQD, mips.ACMPGEF, mips.ACMPGED,
mips.ACMPGTF, mips.ACMPGTD:
return true
}
return false
}
// IsMIPSMUL reports whether the op (as defined by an mips.A* constant) is
// one of the MUL/DIV/REM/MADD/MSUB instructions that require special handling.
func IsMIPSMUL(op obj.As) bool {
switch op {
case mips.AMUL, mips.AMULU, mips.AMULV, mips.AMULVU,
mips.ADIV, mips.ADIVU, mips.ADIVV, mips.ADIVVU,
mips.AREM, mips.AREMU, mips.AREMV, mips.AREMVU,
mips.AMADD, mips.AMSUB:
return true
}
return false
}
func mipsRegisterNumber(name string, n int16) (int16, bool) {
switch name {
case "F":
if 0 <= n && n <= 31 {
return mips.REG_F0 + n, true
}
case "FCR":
if 0 <= n && n <= 31 {
return mips.REG_FCR0 + n, true
}
case "M":
if 0 <= n && n <= 31 {
return mips.REG_M0 + n, true
}
case "R":
if 0 <= n && n <= 31 {
return mips.REG_R0 + n, true
}
case "W":
if 0 <= n && n <= 31 {
return mips.REG_W0 + n, true
}
}
return 0, false
}
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