[PATCH] x86: Encode AVX256/AVX512 vpsub[bwdq] with VEX128/EVEX128

[H.J. Lu]

On Tue, Feb 27, 2018 at 8:20 AM, H.J. Lu <hongjiu.lu@intel.com> wrote:
> When 2 source registers are identical, AVX256 and AVX512 vpsub[bwdq]
> instructions can be encoded with VEX128 or EVEX128 encodings.
>
> Any comments?
>
> H.J.
> gas/
>
>         * config/tc-i386.c (optimize_encoding): Optimize AVX256 and
>         AVX512 vpsub[bwdq] instructions.
>         * testsuite/gas/i386/optimize-1.s: Add tests for AVX256 and
>         AVX512 vpsub[bwdq] instructions.
>         * testsuite/gas/i386/x86-64-optimize-2.s: Likewise.
>         * testsuite/gas/i386/optimize-1.d: Updated.
>         * testsuite/gas/i386/x86-64-optimize-2.d: Likewise.
>
> opcodes/
>
>         * * i386-opc.tbl: Add "Optimize" to AVX256 and AVX512
>         vpsub[bwdq] instructions.
>         * i386-tbl.h: Regenerated.

I am checking it in.

-- 
H.J.