On Tue, 20 Sep 2022 22:12:04 GMT, Xue-Lei Andrew Fan wrote:
> Hi,
>
> In the message digest implementation, for example SHA256, in JDK, two bitwise
> operations could be improved with equivalent arithmetic, and then the number
> bitwise operations could be reduced accordingly. Specifically
>
On Wed, 21 Sep 2022 18:29:08 GMT, Aleksey Shipilev wrote:
>> @shipilev Good points and I agree with them.
>>
>>> Are you getting +0.8% throughput on microbenchmarks?
>>
>> Yes, I got it a few times. I tested on MacOS/M1 and Linux/AMD for
>> 64/512/2048/16384 bytes. As the improvement is not s
On Wed, 28 Sep 2022 08:12:09 GMT, Ferenc Rakoczi wrote:
>> Hi,
>>
>> In the message digest implementation, for example SHA256, in JDK, two
>> bitwise operations could be improved with equivalent arithmetic, and then
>> the number bitwise operations could be reduced accordingly. Specifically
>
On Tue, 20 Sep 2022 22:12:04 GMT, Xue-Lei Andrew Fan wrote:
> Hi,
>
> In the message digest implementation, for example SHA256, in JDK, two bitwise
> operations could be improved with equivalent arithmetic, and then the number
> bitwise operations could be reduced accordingly. Specifically
>
On Wed, 21 Sep 2022 18:29:08 GMT, Aleksey Shipilev wrote:
> Maybe older X86 and AArch64 are our targets, since it is not guaranteed to
> have SHA hardware intrinsics?
Yes, the platforms that do not support SHA intrinsics are the targets. If I
read the OpenJDK CPU code correctly, RISC-V and AR
On Wed, 21 Sep 2022 15:14:22 GMT, Xue-Lei Andrew Fan wrote:
> But you let me convinced that this may not be worthy of the effort.
Let's think about it and not discount it right away. 1% improvement on OpenJDK
scale is still quite significant, if we can show the non-interpreter modes
benefit fr
On Wed, 21 Sep 2022 12:06:31 GMT, Aleksey Shipilev wrote:
>> Hi,
>>
>> In the message digest implementation, for example SHA256, in JDK, two
>> bitwise operations could be improved with equivalent arithmetic, and then
>> the number bitwise operations could be reduced accordingly. Specifically
On Tue, 20 Sep 2022 22:12:04 GMT, Xue-Lei Andrew Fan wrote:
> Hi,
>
> In the message digest implementation, for example SHA256, in JDK, two bitwise
> operations could be improved with equivalent arithmetic, and then the number
> bitwise operations could be reduced accordingly. Specifically
>
Hi,
In the message digest implementation, for example SHA256, in JDK, two bitwise
operations could be improved with equivalent arithmetic, and then the number
bitwise operations could be reduced accordingly. Specifically
"(x and y) xor ((complement x) and z)" could be replaced with the equivale
