[Bug rtl-optimization/19097] [3.4/4.0/4.1 regression] Quadratic behavior with many sets for the same register in gcse CPROP

[phython at gcc dot gnu dot org]

------- Additional Comments From phython at gcc dot gnu dot org  2005-08-23 06:46 -------
Here is an updated time-report with the main time contributors on ppc-linux with
checking disabled.
 tree VRP              :  75.60 (11%) usr   0.39 ( 0%) sys  89.92 ( 9%) wall  
13693 kB ( 6%) ggc
 tree operand scan     : 256.77 (37%) usr   1.36 ( 2%) sys 287.58 (28%) wall
2122 kB ( 1%) ggc
 scheduling            : 274.05 (39%) usr  73.82 (89%) sys 381.13 (37%) wall
6251 kB ( 3%) ggc
 global alloc          :   6.98 ( 1%) usr   3.48 ( 4%) sys 166.93 (16%) wall
5469 kB ( 3%) ggc

 global alloc was really slow because it took a lot of memory, more than my
machine had.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19097