[llvm-bugs] [Bug 30611] New: BFI instruction with zero register decoded as bad BFC instruction

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30611

            Bug ID: 30611
           Summary: BFI instruction with zero register decoded as bad BFC
                    instruction
           Product: libraries
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: AArch64
          Assignee: unassignedbugs at nondot.org
          Reporter: njholcomb at wi.rr.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Decoding an A64 base instruction with bytes: 0x331957fa should produce a bit
field insert of the zero register: 
bfi w26, wzr, #7, #22

The current output is a BFC instruction (which already cannot be encoded in the
A64 base instruction):
bfc w26, #7, #22

This instruction is incorrect because the BFC instruction only supports 4 bits
of register name, meaning w26 is out of bounds as a register for this
instruction.

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