[Bug regression/21456] New: compile time regression(s) after gcc-4.0-20050326, 4.0 (+300%) 4.1 (+500%)

[andre dot maute at gmx dot de]

i used the file compiletimetest2.cc from the attachment in    
    
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16613    
    
and noticed that compile time regressions were introduced after  
gcc-4.0-20050430  
  
i added the timings for the 4.0 snapshots to  
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16613  
  
because there are also many older time reports.  
  
now here for gcc-4.1-20050508  
  
> gcc-4.1-20050508 -v  
Using built-in specs.  
Target: i686-pc-linux-gnu  
Configured with: ../gcc-4.1-20050508/configure --prefix=/opt/gcc-4.1-20050508  
--program-suffix=-4.1-20050508 --enable-shared --enable-languages=c,c++  
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu  
--disable-nls --disable-checking --with-arch=pentium3  
Thread model: posix  
gcc version 4.1.0 20050508 (experimental)  
  
  
> time g++-4.1-20050508 -c -O3 -D __NDEBUG__ cotime g++-4.1-20050508 -c -O3 -D  
__DEBUG__ compiletimetest2.cc  
real    1m47.056s        user    1m45.474s      sys     0m1.392s 
  
> time g++-4.1-20050508 -c -O3 -D __DEBUG__ compiletimetest2.cc  
  
real    1m53.201s        user    1m51.746s      sys     0m1.319s  
 
> g++-4.1-20050508 -c -O3 -D __NDEBUG__ compiletimetest2.cc  -save-temps 
> ls -al compiletimetest2.s 
-rw-r--r--    1 login500 users     1602910 May  8 23:20 compiletimetest2.s 
 
the assembler file increased once more now 1.603 mb, gcc-3.4.3 (0.520mb), 
gcc-3.3.5 (0.355mb) 
 
gcc-3.4.3 did the whole thing in under 20s. 
gcc-3.3.5 under 11s 
 
i know i'm using -O3. But you see, this is almost a factor of 8.5. 
 
Regards Andre

-- 
           Summary: compile time regression(s) after gcc-4.0-20050326, 4.0
                    (+300%) 4.1 (+500%)
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: regression
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: andre dot maute at gmx dot de
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21456