[llvm-bugs] [Bug 39542] New: Could not join subrange in testcase with no meaningful values

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39542

            Bug ID: 39542
           Summary: Could not join subrange in testcase with no meaningful
                    values
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Register Allocator
          Assignee: unassignedbugs at nondot.org
          Reporter: Matthew.Arsenault at amd.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 21074
  --> https://bugs.llvm.org/attachment.cgi?id=21074&action=edit
Reduced testcase

The failing case concludes CR_Impossible because of this:
  // We need to verify that no instructions are reading the clobbered lanes. To
  // save compile time, we'll only check that locally. Don't allow the tainted
  // value to escape the basic block.
  MachineBasicBlock *MBB = Indexes->getMBBFromIndex(VNI->def);
  if (OtherLRQ.endPoint() >= Indexes->getMBBEndIdx(MBB))
    return CR_Impossible;

Not sure why it passed the first mapValues

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