https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66396
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
The issue is corrupted VOPs.
<bb 2>:
# .MEM_4 = VDEF <.MEM_3(D)>
iD.1808@ = 1;
# .MEM_5 = VDEF <.MEM_4>
xD.1810@ = &iD.1808@;
# .MEM_6 = VDEF <.MEM_5>
yD.1811@ = &jD.1807@;
# .MEM_7 = VDEF <.MEM_6>
fD.1806@.pD.1801 = &yD.1811@;
# .MEM_8 = VDEF <.MEM_7>
fD.1806@.qD.1802 = &xD.1810@;
# PT = { D.1806 }
p_25 = &fD.1806@ + 4;
# .MEM_28 = VDEF <.MEM_3(D)>
jD.1807@ = 4;
see how that uses the wrong VUSE.
