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Re: [PATCH 5/9] x86: replace NoRex64 on VEX-encoded insns
On Wed, Mar 4, 2020 at 2:06 AM Jan Beulich <jbeulich@suse.com> wrote:
>
> When the template specifies any of the possible VexW settings, we can
> use this instead of a separate NoRex64 to suppress the setting of REX_W.
> Note that this ends up addressing an inconsistency between VEX- and
> EVEX-encoded VEXTRACTPS, VPEXTR{B,W}, and VPINSR{B,W} - while the former
> avoided setting VEX.W, the latter pointlessly set EVEX.W when there is a
> 64-bit GPR operand. Adjust the testcase to cover both cases.
>
> Convert VexW= to their respective VexW* on lines touched anyway.
>
> gas/
> 2020-03-XX Jan Beulich <jbeulich@suse.com>
>
> * config/tc-i386.c (process_suffix): Exlucde !vexw insns
> alongside !norex64 ones.
> * testsuite/gas/i386/x86-64-avx512bw.s: Test VPEXTR* and VPINSR*
> with both 32- and 64-bit GPR operands.
> * testsuite/gas/i386/x86-64-avx512f.s: Test VEXTRACTPS with both
> 32- and 64-bit GPR operands.
> * testsuite/gas/i386/x86-64-avx512bw-intel.d,
> testsuite/gas/i386/x86-64-avx512bw.d,
> testsuite/gas/i386/x86-64-avx512f-intel.d,
> testsuite/gas/i386/x86-64-avx512f.d: Adjust expectations.
>
> opcodes/
> 2020-03-XX Jan Beulich <jbeulich@suse.com>
>
> * i386-opc.tbl (movq): Drop NoRex64 from XMM/XMM SSE2AVX variants.
> (movmskps, pextrw, pinsrw, pmovmskb, movmskpd, extractps,
> pextrb, pinsrb, roundsd): Drop NoRex64 and where applicable use
> VexW0 on SSE2AVX variants.
> (vmovq): Drop NoRex64 from XMM/XMM variants.
> (vextractps, vmovmskpd, vmovmskps, vpextrb, vpextrw, vpinsrb,
> vpinsrw, vpmovmskb, vroundsd, vpmovmskb): Drop NoRex64 and where
> applicable use VexW0.
> * i386-tbl.h: Re-generate.
> ---
> In principle this paves the way for folding NoRex64 with some VEX-only
> attribute bit, as there's no VEX-or-alike insn left with NoRex64 set
> (and following the underlying model there also isn't going to be).
OK.
Thanks.
--
H.J.