[llvm-bugs] [Bug 28464] New: Update live range properly after dummy instructions in DeadRemat being inserted

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28464

            Bug ID: 28464
           Summary: Update live range properly after dummy instructions in
                    DeadRemat being inserted
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Register Allocator
          Assignee: unassignedbugs at nondot.org
          Reporter: wmi at google.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Now we don't have proper live interval update after dummy instructions in
DeadRemat being inserted. It hasn't caused big trouble because
isTriviallyReMaterializable restricts the formats of rematerializable
instruction (D19486). If someday we relax the limitation in
isTriviallyReMaterializable and allow more complex instructions to be
rematerializable, the problem will surface.

File this bug as a reminder to find a proper fix to the live interval update
problem.

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