[Bug target/34163] [4.3/4.4/4.5 Regression] 10% performance regression since Nov 1 on Polyhedron's "NF" on AMD64

rguenth at gcc dot gnu dot org gcc-bugzilla@gcc.gnu.org
Fri Jul 3 11:14:00 GMT 2009



------- Comment #20 from rguenth at gcc dot gnu dot org  2009-07-03 11:14 -------
Before:

 Time for setup          0.139
 Time per iteration      0.271
 Total Time              6.649
 Time for setup          0.136
 Time per iteration      0.265
 Total Time             10.210
 Time for setup          0.134
 Time per iteration      0.265
 Total Time              7.276
 Time for setup          0.134
 Time per iteration      0.260
 Total Time             11.572

After:

 Time for setup          0.114
 Time per iteration      0.238
 Total Time              5.834
 Time for setup          0.111
 Time per iteration      0.233
 Total Time              8.948
 Time for setup          0.110
 Time per iteration      0.237
 Total Time              6.504
 Time for setup          0.112
 Time per iteration      0.235
 Total Time             10.454

which seems to exactly recover this regression.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34163



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