}
	return f.cachedSdom
}

// loopnest returns the loop nest information for f.
func (f *Func) loopnest() *loopnest {
	if f.cachedLoopnest == nil {
		f.cachedLoopnest = loopnestfor(f)
	}
	return f.cachedLoopnest
}

// invalidateCFG tells f that its CFG has changed.
func (f *Func) invalidateCFG() {
	f.cachedPostorder = nil
	f.cachedIdom = nil
	f.cachedSdom = nil