[llvm-bugs] [Bug 32039] New: Very slow compilation / high memory use with LoopStrengthReduce and SCEV

[via llvm-bugs]

http://bugs.llvm.org/show_bug.cgi?id=32039

            Bug ID: 32039
           Summary: Very slow compilation / high memory use with
                    LoopStrengthReduce and SCEV
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: joerg at NetBSD.org
                CC: llvm-bugs at lists.llvm.org

Created attachment 18017
  --> http://bugs.llvm.org/attachment.cgi?id=18017&action=edit
Test case

The attached test case is from Scribus. Compiling with -O2 will eat > 1GB RAM
and take a long time to compile. The semantically equivalent version with many
of the while loops replaced by plain ifs is much faster.

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