https://sourceware.org/bugzilla/show_bug.cgi?id=29525

            Bug ID: 29525
           Summary: x86: CMPSD and MOVSD wrongly accepted in AT&T mode
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: jbeulich at suse dot com
  Target Milestone: ---

'd' is not a valid insn sizing suffix in AT&T mode; the proper one is 'l'.
Observe the anomalies when assembling

        cmpsd
        iretd
        lodsd
        movsd
        scasd
        stosd

See the v1 posting of a patch addressing this:
https://sourceware.org/pipermail/binutils/2022-August/122458.html

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