[Bug gas/20703] New: [gas][x86] Cannot assemble certain registers for vpmuludq instruction

[nholcomb at wisc dot edu]

https://sourceware.org/bugzilla/show_bug.cgi?id=20703

            Bug ID: 20703
           Summary: [gas][x86] Cannot assemble certain registers for
                    vpmuludq instruction
           Product: binutils
           Version: 2.26
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: nholcomb at wisc dot edu
  Target Milestone: ---

The following instruction produced by objdump cannot be assembled by GAS due to
an error:

Bytes: 62 c1 95 00 f4 41 42
Instruction: vpmuludq 0x420(%r9), %xmm29, %xmm16
ERROR:  invalid register operand for `vpmuludq'

This might be a limitation on the part of gas. Checking other decoders like XED
and LLVM, the instruction appears to be valid.

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