[LLVMbugs] [Bug 817] [scev trip-count computation] performance regression on nested-loop

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Fri Nov 30 22:30:55 PST 2007


Nick Lewycky <nicholas at mxc.ca> changed:

           What    |Removed                     |Added
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |DUPLICATE

--- Comment #13 from Nick Lewycky <nicholas at mxc.ca>  2007-12-01 00:30:54 ---
As filed, nothing. The run-time performance regression on nested-loop has been

The bug transmuted a bit, and the patch affects entirely different code than
the change from PR1614. PR1614 removed extra work from HowManyLessThans while
this patch changes ComputeIterationCount so that it will use HowManyLessThans
more often, instead of falling back to exhaustive computation.

I'm going to close this bug and not refile it, given that we don't have a code
example that would necessitate modifying ComputeIterationCount this way.

*** This bug has been marked as a duplicate of bug 1614 ***

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