[llvm-bugs] [Bug 49176] New: Fix shift instruction miscompilation in the AVR backend

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49176

            Bug ID: 49176
           Summary: Fix shift instruction miscompilation in the AVR
                    backend
           Product: new-bugs
           Version: 11.0
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: aykevanlaethem at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org
            Blocks: 48902

There was a critical bug in the AVR backend which meant that many 16-bit shifts
were miscompiled. This has been fixed in https://reviews.llvm.org/D96590
(commit https://reviews.llvm.org/rGefb1cb752bf12149af9c773f702a757ba9721649).

This is a regression from LLVM 11. I think this should be included in the LLVM
12 branch, as without it the AVR backend is almost unusable.


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=48902
[Bug 48902] [meta] 12.0.0 Release Blockers
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