[Bug rtl-optimization/104498] Alias attribute being ignored by scheduler

[rsandifo at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104498

rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2022-02-11
             Status|UNCONFIRMED                 |NEW

--- Comment #6 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> 
---
The problem is that compare_base_symbol_refs can swap x and y:

      if (!x_decl)
        {
          std::swap (x_decl, y_decl);
          std::swap (x_base, y_base);
        }

but this doesn't change the polarity of the distance added here:

      if (distance)
        *distance += (SYMBOL_REF_BLOCK_OFFSET (y_base)
                      - SYMBOL_REF_BLOCK_OFFSET (x_base));