[riscv-port] RFR: 8280845: riscv: Intrinsify BigInteger.montgomerySquare

Fri Jan 28 09:27:53 UTC 2022

Intrinsify BigInteger.montgomerySquare on RISCV.
On unmatched borad,  performance of SPECjvm2008 crypto with intrinsic has improved 40%. The details are as follows：
Tested with option “UseMontgomerySquareIntrinsic”.
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TRUE(ops/m) | 1 | 2 | 3 | 4 | geomean |  
-- | -- | -- | -- | -- | -- | --
crypto.aes | 6.04 | 6.07 | 5.78 | 5.76 | 5.91 | 100.81%
crypto.rsa | 171.75 | 172.01 | 172.03 | 172.07 | 171.96 | 239.34%
crypto.signverify | 63.91 | 63.77 | 63.96 | 63.76 | 63.85 | 114.35%
crypto | 40.48 | 40.52 | 39.92 | 39.84 | 40.19 | 140.25%
FALSE(ops/m) |   |   |   |   |   |  
crypto.aes | 5.75 | 5.75 | 6.26 | 5.71 | 5.86 |  
crypto.rsa | 72.86 | 73.22 | 68.87 | 72.53 | 71.85 |  
crypto.signverify | 55.75 | 55.55 | 55.76 | 56.29 | 55.84 |  
crypto | 28.58 | 28.6 | 28.87 | 28.57 | 28.65 |  

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Commit messages:
 - 8280845: riscv: Intrinsify BigInteger.montgomerySquare

Changes: https://git.openjdk.java.net/riscv-port/pull/56/files
 Webrev: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=56&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280845
  Stats: 248 lines in 2 files changed: 208 ins; 2 del; 38 mod
  Patch: https://git.openjdk.java.net/riscv-port/pull/56.diff
  Fetch: git fetch https://git.openjdk.java.net/riscv-port pull/56/head:pull/56

PR: https://git.openjdk.java.net/riscv-port/pull/56