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

[Pu Lehui]

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.

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.

> 
> Björn