// to avoid needing to recompute the literal pool flush points
// as span-dependent jumps are enlarged.
const maxPCDisp = 512 * 1024

// ispcdisp reports whether v is a valid PC-relative displacement.
func ispcdisp(v int32) bool {
	return -maxPCDisp < v && v < maxPCDisp && v&3 == 0
}

func isaddcon(v int64) bool {
	/* uimm12 or uimm24? */
	if v < 0 {
		return false
	}