[llvm-bugs] [Bug 31256] New: Extend register allocator to support undefined instructions

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31256

            Bug ID: 31256
           Summary: Extend register allocator to support undefined
                    instructions
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: AVR
          Assignee: unassignedbugs at nondot.org
          Reporter: dylanmckay34 at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

The AVR architecture as a list of instructions which are simply undefined and
will crash the MCU if they are hit.

LLVM has trouble with this as it is not a common concept.

We need to extend the register allocator so that it doesn't attempt to allocate
registers which would cause a given instruction to be undefined.

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