[Bug rtl-optimization/19078] [4.0 Regression] Poor quality code after loop unrolling.

[rakdver at gcc dot gnu dot org]

------- Additional Comments From rakdver at gcc dot gnu dot org  2004-12-19 22:04 -------
With minor adjustment in ivopts, we get the same code as in 3.3 with fno-split-
ivs-in-unroller, and more reasonably looking code without; I'm testing the 
patch just now.

Of course we cannot have autoincrements and iv splitting at the same time. It 
might be possible to use some heuristics to disable iv splitting if it does not 
seem useful.  Possibly even better would be to add generation of autoincrements 
to loop optimizer, but this would require fixing cse so that it handles them 
correctly.

-- 
           What    |Removed                     |Added
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         AssignedTo|unassigned at gcc dot gnu   |rakdver at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19078