[Bug rtl-optimization/24123] Massive performance regression for -ffast-math due to the recip tree pass

[uros at kss-loka dot si]

------- Additional Comments From uros at kss-loka dot si  2005-09-30 07:49 -------
(In reply to comment #5)

> No, the RA is supposed to move the divisions so that things don't spill.
> 
> Can you also try the patch at
> http://gcc.gnu.org/ml/gcc-patches/2005-09/msg01555.html

  Yes, this patch fixes the problem!

  (However, if this really is RA problem with divisions, this patch hides it).

Each sample counts as 0.00195312 seconds.
  %   cumulative   self              self     total           
 time   seconds   seconds    calls   s/call   s/call  name    
 10.53      1.46     1.46  3849654     0.00     0.00 
pov::Intersect_Light_Tree(pov::Ray_Struct*, pov::Project_Tree_Node_Struct*, int,
int, pov::istk_entry*, pov::Object_Struct**, pov::Light_Source_Struct*)
  9.59      2.79     1.33   242013     0.00     0.00  pov::sbisect(int, pov::p*,
double, double, int, int, double*)
  6.19      3.65     0.86  2622158     0.00     0.00 
pov::POVFPU_RunDefault(unsigned)
  5.86      4.46     0.81  3162520     0.00     0.00 
pov::All_Blob_Intersections(pov::Object_Struct*, pov::Ray_Struct*,
pov::istack_struct*)
  5.79      5.27     0.80  3930163     0.00     0.00 
pov::block_light_source(pov::Light_Source_Struct*, double, pov::Ray_Struct*,
pov::Ray_Struct*, double*, float*)

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
  BugsThisDependsOn|                            |23948


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24123