[PATCH bpf-next v2 0/6] Zbb support and code simplification for RV64 JIT

[Björn Töpel]

Pu Lehui <pulehui at huaweicloud.com> writes:

> On 2023/9/28 18:44, Björn Töpel wrote:
>> Pu Lehui <pulehui at huaweicloud.com> writes:
>> 
>>> Add Zbb support [0] to optimize code size and performance of RV64 JIT.
>>> Meanwhile, adjust the code for unification and simplification. Tests
>>> test_bpf.ko and test_verifier have passed, as well as the relative
>>> testcases of test_progs*.
>> 
>> Nice work!
>> 
>> Did you measure how the instruction count changed for, say, test_bpf.ko
>> and test_progs? >
>
> Sorry for not responding for so long.

Welcome back!

> I made statistics on the number of body instructions and the changes are 
> as follows:
>
> test_progs:
> 1. verifier_movsx: 260 -> 224
> 2. verifier_bswap: 180 -> 56
>
> test_bpf.ko:
> 1. MOVSX: 154 -> 146
> 2. BSWAP: 336 -> 136
>
> We can see that the change in BSWAP is obvious, and the change in MOVSX 
> is in line with expectations.

Thank you. I'll test/review the v3 during the week!


Cheers,
Björn