[Bug binutils/20705] New: [libopcodes][x86] VEX masking register name lacks formatting, cannot assemble

[nholcomb at wisc dot edu]

https://sourceware.org/bugzilla/show_bug.cgi?id=20705

            Bug ID: 20705
           Summary: [libopcodes][x86] VEX masking register name lacks
                    formatting, cannot assemble
           Product: binutils
           Version: 2.26
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: nholcomb at wisc dot edu
  Target Milestone: ---

The following instruction produced by objdump cannot be assembled with gas due
to an error.

Bytes: c5 ac 46 f5
Instruction: kxnorw %k5, k2, %k6
ERROR: operand size mismatch for `kxnorw'

By changing the second operand to "%k2" instead of "k2", the output could be
reassembled. I'm not sure if this should be reported to gas as well to allow
the "k2" syntax in addition to "%k2", but I think objdump should be producing
valid assembly regardless.

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