[llvm-bugs] [Bug 33051] New: NewGVN exhibits non-deterministic behaviour

via llvm-bugs llvm-bugs at lists.llvm.org
Mon May 15 12:50:20 PDT 2017


            Bug ID: 33051
           Summary: NewGVN exhibits non-deterministic behaviour
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: davide at freebsd.org
                CC: dberlin at dberlin.org, filcab at gmail.com,
                    llvm-bugs at lists.llvm.org, llvm-dev at redking.me.uk

This seems to be a tricky one.
The way to reproduce (thanks Takumi) is that of re-enabling pr32934.ll (in
test/Transform/NewGVN), copying it 1000 times

 for x in `seq 1000 1999`;do ln -sv pr32934.ll pr32934_$x.ll;done

and running `ninja check-llvm`.

A bunch of the copies will fail.

I think I narrowed down the problem a bit.

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