[Bug middle-end/60291] [4.7/4.8/4.9 Regression] slow compile times for any mode (-O0/-O1/-O2) on large .c source file (30MBs)

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60291

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |4.3.6
   Target Milestone|---                         |4.7.4
            Summary|slow compile times for any  |[4.7/4.8/4.9 Regression]
                   |mode (-O0/-O1/-O2) on large |slow compile times for any
                   |.c source file (30MBs)      |mode (-O0/-O1/-O2) on large
                   |                            |.c source file (30MBs)

--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 4.3 needs 22.5s at -O0.  GCC 4.7 doesn't exhibit the unused-vars-remove
slowness:

 expand                  :  46.53 (42%) usr   0.96 ( 9%) sys  47.17 (39%) wall 
173344 kB ( 7%) ggc
 remove unused locals    :   0.56 ( 1%) usr   0.07 ( 1%) sys   0.48 ( 0%) wall 
     0 kB ( 0%) ggc
 TOTAL                 : 110.45            10.58           121.70           
2343278 kB