https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114736
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot
gnu.org
Last reconfirmed| |2024-04-16
Ever confirmed|0 |1
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. The missing node is
t.f90:1:21: note: node 0x39e3a80 (max_nunits=1, refcnt=2) vector(2)
real(kind=4)
t.f90:1:21: note: op: VEC_PERM_EXPR
t.f90:1:21: note: { }
t.f90:1:21: note: lane permutation { 0[1] 0[0] }
t.f90:1:21: note: children 0x39e37b0
23 (4) <- 22
-> 26 24
26 (-1) <- 23
-> 17
17 (6) <- 26 16
-> 19 18
and the edge making it backward reachable is marked as latch. Specifically
those vertices we mark as leaf forcefully in build_vertices do not match
those made unreachable by build_graph via ignoring latch edges.
t.f90:1:21: note: node 0x39e37b0 (max_nunits=2, refcnt=2) vector(2)
real(kind=4)
t.f90:1:21: note: op template: a__I_IM_lsm0.22_6 = PHI <_12(20), _73(19)>
t.f90:1:21: note: stmt 0 a__I_IM_lsm0.22_6 = PHI <_12(20), _73(19)>
t.f90:1:21: note: stmt 1 a__I_RE_lsm0.23_18 = PHI <_11(20), _74(19)>
t.f90:1:21: note: children 0x39e3840 0x39e38d0
and the issue is that the representative of the VEC_PERM node is
a__I_IM_lsm0.22_6 = PHI <_12(20), _73(19)> (a NULL one is avoided for crashes).
