[llvm-bugs] [Bug 28670] New: GVNHoist pass uses a large amount of memory and appears to hang due to large increase in buildtime

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28670

            Bug ID: 28670
           Summary: GVNHoist pass uses a large amount of memory and
                    appears to hang due to large increase in buildtime
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: alina.sbirlea at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 16795
  --> https://llvm.org/bugs/attachment.cgi?id=16795&action=edit
Sample testcase

The recently added GVNHoist pass causes certain Halide tests to take forever
making Halide unusable.

More details on discussion: https://reviews.llvm.org/D22639

Adding a sample testcase generated by Halide. 
Test using "opt -gvn-hoist gvnhoist_small.bc".

An even larger testcase can be found here:
https://drive.google.com/open?id=0B01oOnN8VyO8MnpIdlpBcmRybmc

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