[Bug tree-optimization/81403] wrong code at -O3

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81403

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
PRE losing "& 10393" at -O3 but not -O2 (the previous dumps are identical)

@@ -611,6 +639,7 @@
 ;;                6 [100.0%]  (FALLTHRU,EXECUTABLE)
   # .MEM_21 = PHI <.MEM_26(5), .MEM_25(6)>
   # prephitmp_34 = PHI <_30(5), _30(6)>
+  # prephitmp_35 = PHI <_30(5), _30(6)>
   # VUSE <.MEM_21>
   var_33.4_11 = var_33D.35372;
   if (var_33.4_11 != 0)
@@ -624,9 +653,7 @@
 ;;    prev block 7, next block 9, flags: (NEW, REACHABLE, VISITED)
 ;;    pred:       7 [54.0%]  (TRUE_VALUE,EXECUTABLE)
   # RANGE [0, 10393] NONZERO 10393
-  _29 = prephitmp_34 & 10393;
-  # RANGE [0, 10393] NONZERO 10393
-  _15 = (long intD.12) _29;
+  _15 = (long intD.12) prephitmp_35;