[Bug rtl-optimization/13931] [3.3/3.4/3.5 Regression] combiner much slower on big basic blocks

["pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-06-07 19:08 -------
Actually look into this there is a compile time regression in 3.3.3 also from 3.2.3:
tin:~/src/gnu/gcctest>time gcc -S -O1 pr13931.c
2.050u 0.040s 0:02.15 97.2%     0+0k 0+0io 942pf+0w
tin:~/src/gnu/gcctest>time ~/ia32_linux_gcc3_2/bin/gcc -S -O1 pr13931.c
0.350u 0.040s 0:00.45 86.6%     0+0k 0+0io 687pf+0w
tin:~/src/gnu/gcctest>time ~/ia32_linux_gcc3_3/bin/gcc -S -O1 pr13931.c
1.700u 0.030s 0:01.77 97.7%     0+0k 0+0io 708pf+0w
tin:~/src/gnu/gcctest>time ~/ia32_linux_gcc3_4/bin/gcc -S -O1 pr13931.c
1.790u 0.030s 0:01.86 97.8%     0+0k 0+0io 734pf+0w

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |3.3.3 3.4.0 3.5.0
      Known to work|                            |3.2.3
            Summary|[3.4/3.5 Regression]        |[3.3/3.4/3.5 Regression]
                   |combiner much slower on big |combiner much slower on big
                   |basic blocks                |basic blocks


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13931