[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v4 02/20] x86emul: support most remaining AVX2 insns
>>> On 05.03.18 at 14:39, <andrew.cooper3@xxxxxxxxxx> wrote: > On 28/02/18 12:58, Jan Beulich wrote: > > You're missing a SoB on this version of the patch, but assuming that > gets fixed, Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Thanks and - oops, I had dropped description and revision info as well: I.e. those not being equivalents of SSEn ones, but with the exception of the various gather operations. Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> --- v4: Split off AVX2 extensions to vbroadcasts{s,d}. Drop comment referring to no longer existing simd_scalar_dq. >> --- a/xen/arch/x86/x86_emulate/x86_emulate.c >> +++ b/xen/arch/x86/x86_emulate/x86_emulate.c >> @@ -7306,6 +7325,11 @@ x86_emulate( >> op_bytes = 8 << vex.l; >> goto simd_0f_ymm; >> >> + case X86EMUL_OPC_VEX_66(0x0f38, 0x16): /* vpermps ymm/m256,ymm,ymm */ >> + case X86EMUL_OPC_VEX_66(0x0f38, 0x36): /* vpermd ymm/m256,ymm,ymm */ > > It seems especially odd that these don't cope with vex.l or vex.w. I > can only guess that it down to a limitation in the vector pipeline which > wasn't resolved until AVX-512 was introduced. Yeah, there are a few more such anomalies, also in AVX512 iirc. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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