[Bug rtl-optimization/19597] New: avr-gcc 4.0, multiplication by constant, very long code

[dmixm at marine dot febras dot ru]

avr-gcc 4.0 (20050116) replaces multiplication by a constant to a combination 
of more simple 
operations. Thus it does not pay attention to efficiency of such replacement.  
 
For example: 
        int foo (int x) { return 24011 * x; } 
produce 49 words (-mmcu=atmega8 -Os). 
Older GCC branches -- only 11 words in this case.

-- 
           Summary: avr-gcc 4.0, multiplication by constant, very long code
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dmixm at marine dot febras dot ru
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19597