[Bug tree-optimization/92949] New: bswap/store merging does not handle BIT_INSERT_EXPR

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92949

            Bug ID: 92949
           Summary: bswap/store merging does not handle BIT_INSERT_EXPR
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

While working on lowering bit-field accesses (to allow better optimizations on
the tree level rather than just on the RTL level), I find the bswap/store
merging passes don't handle BIT_INSERT_EXPR.  So we don't transform some things
now.
I could not understand how symbolic_number works so I am filing this bug.