[Bug tree-optimization/127018] [17 regression] ICE when building warzone2100-4.7.0 (error: definition in block .. does not dominate use in block ..)

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127018

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
So we correctly reject placing

t.c:3:6: note: node 0x52202f0 (refcnt=2) vector(2) int
t.c:3:6: note: op template: t_6 = PHI <t_12(10), t_14(6)>
t.c:3:6: note:  stmt 0 t_6 = PHI <t_12(10), t_14(6)>
t.c:3:6: note:  stmt 1 y1_5 = PHI <tt_13(10), 0(6)>
t.c:3:6: note:  children 0x52203a0 0x5220710

but the node is still referenced and we don't revisit it and do not cache
the failed state.