switch op {
	case AADD, AADDS, ASUB, ASUBS, ACMN, ACMP:
		return true
	}
	return false
}

func isADDWop(op obj.As) bool {
	switch op {
	case AADDW, AADDSW, ASUBW, ASUBSW, ACMNW, ACMPW:
		return true
	}
	return false
}

func isADDSop(op obj.As) bool {
	switch op {
	case AADDS, AADDSW, ASUBS, ASUBSW:
		return true
	}
	return false
}

(FADDS a (FMULS  x y)) && a.Block.Func.useFMA(v) => (FMADDS  a x y)
(FADDD a (FMULD  x y)) && a.Block.Func.useFMA(v) => (FMADDD  a x y)
(FSUBS a (FMULS  x y)) && a.Block.Func.useFMA(v) => (FMSUBS  a x y)
(FSUBD a (FMULD  x y)) && a.Block.Func.useFMA(v) => (FMSUBD  a x y)
(FSUBS (FMULS  x y) a) && a.Block.Func.useFMA(v) => (FNMSUBS a x y)
(FSUBD (FMULD  x y) a) && a.Block.Func.useFMA(v) => (FNMSUBD a x y)