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Re: [qemu-s390x] [Qemu-devel] [PATCH v1 09/41] s390x/tcg: Implement VECT
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From: |
Richard Henderson |
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Subject: |
Re: [qemu-s390x] [Qemu-devel] [PATCH v1 09/41] s390x/tcg: Implement VECTOR CHECKSUM |
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Date: |
Mon, 15 Apr 2019 23:08:32 -1000 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 |
On 4/15/19 10:58 PM, David Hildenbrand wrote:
>> You could use
>>
>> tcg_gen_add2_i32(sum, tmp, sum, zero, tmp, zero);
>> tcg_gen_add_i32(sum, sum, tmp);
> That makes perfect sense, I will use that for now, thanks!
>
Here's a funny one. We can do this in one operation:
tcg_gen_add2_i32(tmp, sum, sum, sum, tmp, tmp);
The lower (sum+tmp) carries into the upper (sum+tmp).
We take the upper result and discard the lower.
r~
- [qemu-s390x] [PATCH v1 11/41] s390x/tcg: Implement VECTOR COMPARE *, (continued)
[qemu-s390x] [PATCH v1 07/41] s390x/tcg: Implement VECTOR AVERAGE, David Hildenbrand, 2019/04/11
[qemu-s390x] [PATCH v1 04/41] s390x/tcg: Implement VECTOR ADD WITH CARRY, David Hildenbrand, 2019/04/11
[qemu-s390x] [PATCH v1 03/41] s390x/tcg: Implement VECTOR ADD COMPUTE CARRY, David Hildenbrand, 2019/04/11