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Re: [Qemu-devel] [PATCH v1 15/41] s390x/tcg: Implement VECTOR GALOIS FIE
From: |
David Hildenbrand |
Subject: |
Re: [Qemu-devel] [PATCH v1 15/41] s390x/tcg: Implement VECTOR GALOIS FIELD MULTIPLY SUM (AND ACCUMULATE) |
Date: |
Tue, 16 Apr 2019 11:10:30 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 |
On 13.04.19 01:44, Richard Henderson wrote:
> On 4/11/19 12:08 AM, David Hildenbrand wrote:
>> A galois field multiplication in field 2 is like binary multiplication,
>> however instead of doing ordinary binary additions, xor's are performed.
>> So no carries are considered.
>>
>> Implement all variants via helpers. s390_vec_sar() and s390_vec_shr()
>> will be reused later on.
>>
>> Signed-off-by: David Hildenbrand <address@hidden>
>> ---
>> target/s390x/helper.h | 8 ++
>> target/s390x/insn-data.def | 4 +
>> target/s390x/translate_vx.inc.c | 38 ++++++++
>> target/s390x/vec_int_helper.c | 168 ++++++++++++++++++++++++++++++++
>> 4 files changed, 218 insertions(+)
>
> FYI, this is now the 4th copy of this operation.
>
> arm: pmull
> x86: pclmulqdq
> ppc: vpmsum[bhwd]
>
> We really should promote this to generic. But that can come later,
huh, I tried my best to search for anything related to galois, but seems
like only s390x uses that terminology. :) Well at least I learned how
it is supposed to be calculated.
Thanks!
>
> Reviewed-by: Richard Henderson <address@hidden>
>
>
> r~
>
--
Thanks,
David / dhildenb
- Re: [Qemu-devel] [PATCH v1 18/41] s390x/tcg: Implement VECTOR (MAXIMUM|MINIMUM) (LOGICAL), (continued)
- [Qemu-devel] [PATCH v1 14/41] s390x/tcg: Implement VECTOR EXCLUSIVE OR, David Hildenbrand, 2019/04/11
- [Qemu-devel] [PATCH v1 13/41] s390x/tcg: Implement VECTOR COUNT TRAILING ZEROS, David Hildenbrand, 2019/04/11
- [Qemu-devel] [PATCH v1 17/41] s390x/tcg: Implement VECTOR LOAD POSITIVE, David Hildenbrand, 2019/04/11
- [Qemu-devel] [PATCH v1 15/41] s390x/tcg: Implement VECTOR GALOIS FIELD MULTIPLY SUM (AND ACCUMULATE), David Hildenbrand, 2019/04/11
- [Qemu-devel] [PATCH v1 12/41] s390x/tcg: Implement VECTOR COUNT LEADING ZEROS, David Hildenbrand, 2019/04/11
- [Qemu-devel] [PATCH v1 11/41] s390x/tcg: Implement VECTOR COMPARE *, David Hildenbrand, 2019/04/11
- [Qemu-devel] [PATCH v1 02/41] s390x/tcg: Implement VECTOR ADD, David Hildenbrand, 2019/04/11
- [Qemu-devel] [PATCH v1 05/41] s390x/tcg: Implement VECTOR ADD WITH CARRY COMPUTE CARRY, David Hildenbrand, 2019/04/11
- [Qemu-devel] [PATCH v1 10/41] s390x/tcg: Implement VECTOR ELEMENT COMPARE *, David Hildenbrand, 2019/04/11