[Bug gas/29527] New: x86: ambiguous operands silently accepted in AT&T mode

[jbeulich at suse dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29527

            Bug ID: 29527
           Summary: x86: ambiguous operands silently 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: ---

Note the warnings on the first three insns but their absence on the latter ones
(sizing suffixes ought to be used to disambiguate):

        neg     (%rax)
        not     (%rax)
        nop     (%rax)

        movsx   (%rax), %ax
        movsx   (%rax), %eax
        movsx   (%rax), %rax

        movzx   (%rax), %ax
        movzx   (%rax), %eax
        movzx   (%rax), %rax

        cvtsi2ss (%rax), %xmm0
        vcvtsi2ss (%rax), %xmm0, %xmm0
        vcvtusi2ss (%rax), %xmm0, %xmm0

For MOVSX / MOVZX the first case each is the only one where going silently is
reasonable, as a 16-bit source is very unlikely to be meant (albeit possible to
encode).

Patches addressing these were posted previously, but rejected for questionable
reasons.

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