[Bug binutils/19722] New: [libopcodes] [Aarch64] Undefined SIMD instruction not marked undefined

[njholcomb at wi dot rr.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19722

            Bug ID: 19722
           Summary: [libopcodes] [Aarch64] Undefined SIMD instruction not
                    marked undefined
           Product: binutils
           Version: 2.26
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: njholcomb at wi dot rr.com
  Target Milestone: ---

Pair word instruction, like ldpsw, are undefined if the address for loading is
specified in a register also used as a destination register.

One example from libopcodes is:
ldpsw   x12, x6, [x6],#-8

>From the bytes:
0x68ea18cc

In this case, x6 is both a destination for the load, as well as supplying the
address for the load, which should be undefined.

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