instructions["PSRLDQ"] = x86.APSRLO
	instructions["PADDD"] = x86.APADDL
	// Spellings originally used in CL 97235.
	instructions["MOVBELL"] = x86.AMOVBEL
	instructions["MOVBEQQ"] = x86.AMOVBEQ
	instructions["MOVBEWW"] = x86.AMOVBEW

	return &Arch{
		LinkArch:       linkArch,
		Instructions:   instructions,
		Register:       register,
		RegisterPrefix: nil,
		RegisterNumber: nilRegisterNumber,