RFR: 8318723: RISC-V: C2 UDivL

[Andrew Haley]

On Thu, 26 Oct 2023 06:20:30 GMT, Fei Yang <fyang at openjdk.org> wrote:

> So I tried this on Hifive Unmatched board. Unforunately, JMH test shows some regression for the LongDivMod.testDivideUnsigned `negative` case.

But that case is going to be rare.The larger a number it is, the less common it is. The uniform distribution of this benchmark, in which 0 is as common as 0xb43a61c853a2af20, is grossly unrepresentative of real-world divisors.

In practice, numbers follow some kind of log-normal distribution. Don't fall into the trap of optimizing for a benchmark.

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PR Comment: https://git.openjdk.org/jdk/pull/16346#issuecomment-1780720717