https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97909
--- Comment #3 from Andrew Macleod <amacleod at redhat dot com> --- It should be able to access the currently known global values that have been computed, or if there isn't one, it could still go and calculate a global range. Which is what the default condition would be (ie, if you don't supply a context). And we can explore under what conditions we can use more info... I suspect there are times it would be OK and we can supply a context only then. Regardless, all the on-demand engine does is give you the same information you would have had if you calculated all of it before doing whatever you are about to do. It just avoids the need to do so for anything that isn't relevant. And if there are times that we can't calculate ranges, then we make sure we don't.
