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Re: [Xen-devel] [PATCH v8 28/50] x86emul: support AVX512F floating point manipulation insns
- To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 29 May 2019 05:51:08 -0700
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- Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 29 May 2019 12:51:19 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 15/03/2019 10:56, Jan Beulich wrote:
> @@ -9681,6 +9696,21 @@ x86_emulate(
> op_bytes = 4;
> goto simd_imm8_zmm;
>
> + case X86EMUL_OPC_EVEX_66(0x0f3a, 0x26): /* vgetmantp{s,d}
> $imm8,[xyz]mm/mem,[xyz]mm{k} */
> + case X86EMUL_OPC_EVEX_66(0x0f3a, 0x54): /* vfixupimmp{s,d}
> $imm8,[xyz]mm/mem,[xyz]mm,[xyz]mm{k} */
> + host_and_vcpu_must_have(avx512f);
> + if ( ea.type != OP_REG || !evex.brs )
> + avx512_vlen_check(false);
> + goto simd_imm8_zmm;
> +
> + case X86EMUL_OPC_EVEX_66(0x0f3a, 0x27): /* vgetmants{s,d}
> $imm8,xmm/mem,xmm,xmm{k} */
> + case X86EMUL_OPC_EVEX_66(0x0f3a, 0x55): /* vfixupimms{s,d}
> $imm8,xmm/mem,xmm,xmm{k} */
> + host_and_vcpu_must_have(avx512f);
> + generate_exception_if(ea.type != OP_REG && evex.brs, EXC_UD);
Why the ea.type != OP_REG restriction? These four instructions do take
memory operands.
~Andrew
> + if ( !evex.brs )
> + avx512_vlen_check(true);
> + goto simd_imm8_zmm;
> +
> case X86EMUL_OPC_VEX_66(0x0f3a, 0x30): /* kshiftr{b,w} $imm8,k,k */
> case X86EMUL_OPC_VEX_66(0x0f3a, 0x32): /* kshiftl{b,w} $imm8,k,k */
> if ( !vex.w )
>
>
>
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