[llvm-bugs] [Bug 38224] New: Remove register allocator bug workaround

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38224

            Bug ID: 38224
           Summary: Remove register allocator bug workaround
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: AVR
          Assignee: unassignedbugs at nondot.org
          Reporter: me at dylanmckay.io
                CC: llvm-bugs at lists.llvm.org

The register allocator does not handle certain functions that use the
'LDDWRdPtrQ' instructions which have high register pressure.


The error message is:

LLVM ERROR: ran out of registers during register allocation

In order to work around this, we restricted the allowable registers of
LDDWRdPtrQ to disallow Z.

First noticed in https://github.com/avr-rust/rust/issues/37

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