[Bug tree-optimization/78788] [7 Regression] ICE (segfault) on s390x-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78788

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Found new range for msgcnt_138: [-2147483646, +INF]
Found new range for msgcnt_228: [-2147483646, +INF]
Found new range for msgcnt_172: [-INF, 2147483645]
Found new range for msgcnt_138: [-2147483646, +INF(OVF)]
Found new range for msgcnt_228: [-2147483646, +INF(OVF)]
Found new range for msgcnt_172: [-INF(OVF), 2147483645]
Found new range for msgcnt_138: [-2147483646, +INF]
Found new range for msgcnt_228: [-2147483646, +INF]
Found new range for msgcnt_172: [-INF, 2147483645]
Found new range for msgcnt_138: [-2147483646, +INF(OVF)]
Found new range for msgcnt_228: [-2147483646, +INF(OVF)]
Found new range for msgcnt_172: [-INF(OVF), 2147483645]
Found new range for msgcnt_138: [-2147483646, +INF]
Found new range for msgcnt_228: [-2147483646, +INF]
Found new range for msgcnt_172: [-INF, 2147483645]

another case... (bah).  And the issue is:

Visiting PHI node: msgcnt_138 = PHI <msgcnt_7(40), msgcnt_172(35)>
    Argument #0 (40 -> 36 executable)
        msgcnt_7: [0, +INF(OVF)]
    Argument #1 (35 -> 36 executable)
        msgcnt_172: [-INF(OVF), 2147483645]
Meeting
  [0, +INF(OVF)]
and
  [-INF(OVF), 2147483645]
to
  VARYING
Intersecting
  [-2147483646, msgcnt_7]
and
  [-INF, +INF]
Applying pattern match.pd:2941, generic-match.c:6568
Applying pattern match.pd:2931, generic-match.c:6507
Applying pattern match.pd:2244, generic-match.c:4056
Applying pattern match.pd:2953, generic-match.c:6645
Applying pattern match.pd:2238, generic-match.c:3532
Applying pattern match.pd:2957, generic-match.c:6665
to
  [-2147483646, +INF]
Found new range for msgcnt_138: [-2147483646, +INF]