[llvm-bugs] [Bug 45928] New: [MachineScheduler] -misched-cutoff option seems broken

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45928

            Bug ID: 45928
           Summary: [MachineScheduler] -misched-cutoff option seems broken
           Product: libraries
           Version: 10.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: paulsson at linux.vnet.ibm.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 23487
  --> https://bugs.llvm.org/attachment.cgi?id=23487&action=edit
testcase

I am getting a lot of strange errors with this option (@ e737847):

llc -O3 -mcpu=z13 -misched-cutoff=100  -o crash0.s crash0.ll

crashes after a few times on SystemZ.

with a cutoff=10, it crashes nearly every time.

The crashes are different at different times. It seems that the DAG has reached
its limit but still some scheduling is attempted later on after the DAG has
been rebuilt...

Is this option still used by anyone? I see it was added way back in 2012...

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