RFR: 8314124: RISC-V: implement Base64 intrinsic - decoding

[Aksh Desai]

On Thu, 4 Jul 2024 10:09:41 GMT, Hamlin Li <mli at openjdk.org> wrote:

> ## Performance
> benchmarks run on CanVM-K230
> 
> data
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> Benchmark m2+m1+scalar | (addSpecial) | (errorIndex) | (lineSize) | (maxNumBytes) | Mode | Cnt | Score +intrinsic+rvv | Score -intrinsic | Error | Units | Improvement
> -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --
> Base64Decode.testBase64Decode | 0 | 144 | 4 | 1 | avgt | 10 | 97.771 | 98.506 | 0.713 | ns/op | 1.008
> Base64Decode.testBase64Decode | 0 | 144 | 4 | 3 | avgt | 10 | 117.715 | 118.422 | 0.428 | ns/op | 1.006
> Base64Decode.testBase64Decode | 0 | 144 | 4 | 7 | avgt | 10 | 174.625 | 172.767 | 7.671 | ns/op | 0.989
> Base64Decode.testBase64Decode | 0 | 144 | 4 | 32 | avgt | 10 | 286.391 | 317.175 | 11.443 | ns/op | 1.107
> Base64Decode.testBase64Decode | 0 | 144 | 4 | 64 | avgt | 10 | 336.932 | 503.257 | 15.738 | ns/op | 1.494
> Base64Decode.testBase64Decode | 0 | 144 | 4 | 80 | avgt | 10 | 418.894 | 625.485 | 7.21 | ns/op | 1.493
> Base64Decode.testBase64Decode | 0 | 144 | 4 | 96 | avgt | 10 | 353.813 | 698.67 | 15.485 | ns/op | 1.975
> Base64Decode.testBase64Decode | 0 | 144 | 4 | 112 | avgt | 10 | 499.243 | 866.909 | 4.427 | ns/op | 1.736
> Base64Decode.testBase64Decode | 0 | 144 | 4 | 512 | avgt | 10 | 1451.277 | 3530.048 | 3.685 | ns/op | 2.432
> Base64Decode.testBase64Decode | 0 | 144 | 4 | 1000 | avgt | 10 | 2258.785 | 5964.066 | 9.075 | ns/op | 2.64
> Base64Decode.testBase64Decode | 0 | 144 | 4 | 20000 | avgt | 10 | 39689.204 | 122334.929 | 255.195 | ns/op | 3.082
> Base64Decode.testBase64MIMEDecode | 0 | 144 | 4 | 1 | avgt | 10 | 187.032 | 158.558 | 7.606 | ns/op | 0.848
> Base64Decode.testBase64MIMEDecode | 0 | 144 | 4 | 3 | avgt | 10 | 209.558 | 200.774 | 7.648 | ns/op | 0.958
> Base64Decode.testBase64MIMEDecode | 0 | 144 | 4 | 7 | avgt | 10 | 556.696 | 505.072 | 8.748 | ns/op | 0.907
> Base64Decode.testBase64MIMEDecode | 0 | 144 | 4 | 32 | avgt | 10 | 2139.767 | 1876.825 | 13.787 | ns/op | 0.877
> Base64Decode.testBase64MIMEDecode | 0 | 144 | 4 | 64 | avgt | 10 | 6142.353 | 3818.199 | 35.622 | ns/op | 0.622
> Base64Decode.testBase64MIMEDecode | 0 | 144 | 4 | 80 | avgt | 10 | 8746.205 | 4787.155 | 109.819 | ns/op | 0.547
> Base64Decode.testBase64MIMEDecode | 0 | ...

LGTM

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Marked as reviewed by AkshDesai04 at github.com (no known OpenJDK username).

PR Review: https://git.openjdk.org/jdk/pull/20026#pullrequestreview-2160205834