[Bug gas/15776] New: MSP430 "add Rn, Rm" assembles to nothing

[quandary at remstate dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15776

            Bug ID: 15776
           Summary: MSP430 "add Rn, Rm" assembles to nothing
           Product: binutils
           Version: 2.24 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: quandary at remstate dot com
                CC: nickc at redhat dot com
            Target: msp430-elf

For the msp430-elf target, assembling a register-register add:

add    R4,    R5

Results in no opcodes being generated:

   1                # 1 "demo.S"
   1                add R4, R5
   0 

However, at least one other addressing mode for add (#N, Rm) *does* work.

I'm presently trying to track down where in the codebase the assembled output
gets generated so I can make a fix.

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