[Bug middle-end/85598] [7/8/9 Regression] Incorrect warning only at -O2 and -O3

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85598

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #6)
> Or, couldn't e.g. number of iterations analysis if it determines linear IV
> adjust the value range?

It indeed could if it's just the PHI that is lacking.  OTOH niter analysis
generally computes the number of iterations of an exit, not of a PHI node.

OTOH the sprintf pass could simply compute value-ranges...