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Re: [PATCH] x86-64: accept 64-bit LFS/LGS/LSS forms with suffix or operand size specifier

On Fri, Nov 29, 2019 at 12:27 AM Jan Beulich <> wrote:
> Since we accept these without suffix / operand size specifier, we should
> also do so with one. (The fact that we unilaterally accept these, other
> than far branches, rather than limiting them to Intel64 mode, will be
> taken care of later on.)
> Also take the opportunity and make sure "lfs <reg>, tbyte ptr <mem>"
> et al get rejected outside of 64-bit mode. This became broken by
> dc2be329b950 ("i386: Only check suffix in instruction mnemonic").
> Furthermore cover lgdt et al in the Intel syntax handling as well, which
> continued to work after said commit just by coincidence.
> gas/
> 2019-11-XX  Jan Beulich  <>
>         * config/tc-i386-intel.c (i386_intel_operand): Handle LFS et al
>         as well as LGDT at al when processing O_tbyte_ptr.
>         * testsuite/gas/i386/intelbad.s: Add LDS et al cases.
>         * testsuite/gas/i386/x86-64-intel64.s,
>         * testsuite/gas/i386/x86-64-opcode.s:  Add LFS et al cases.
>         * testsuite/gas/i386/ilp32/x86-64-intel64.d: Add -mintel64
>         command line option and fold expectations with parent dir test.
>         * testsuite/gas/i386/x86-64-intel64.d: Add -mintel64 command
>         line option and adjust expectations.
>         * testsuite/gas/i386/intelbad.l,
>         testsuite/gas/i386/x86-64-opcode.d: Adjust expectations.
> opcodes/
> 2019-11-XX  Jan Beulich  <>
>         * i386-opc.tbl (lfs, lgs, lss): Drop No_qSuf.
>         * i386-tbl.h: Re-generate.




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