[Bug rtl-optimization/38373] New: 32-bit Vortex degradation on PPC due to bad RTL aliasing

[luisgpm at linux dot vnet dot ibm dot com]

The handling of LO_SUM by alias.c:find_base_term causes a degradation on 32-bit
vortex on PPC when used with the new REG_POINTER attribute. 

Making "find_base_term" handle LO_SUM the same way as alias.c:find_base_value
fixes the problem. Preventing "find_base_term" from returning NULL so easily
also fixes the problem.

A fix for 4.5 will most probably be a combination of these two approaches.


-- 
           Summary: 32-bit Vortex degradation on PPC due to bad RTL aliasing
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: luisgpm at linux dot vnet dot ibm dot com
 GCC build triplet: powerpc*-*-*
  GCC host triplet: powerpc*-*-*
GCC target triplet: powerpc*-*-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38373