RFR: 8282221: x86 intrinsics for divideUnsigned and remainderUnsigned methods in java.lang.Integer and java.lang.Long [v12]

[Sandhya Viswanathan]

On Fri, 8 Apr 2022 01:05:33 GMT, Srinivas Vamsi Parasa <duke at openjdk.java.net> wrote:

>> Optimizes the divideUnsigned() and remainderUnsigned() methods in java.lang.Integer and java.lang.Long classes using x86 intrinsics. This change shows 3x improvement for Integer methods and upto 25% improvement for Long. This change also implements the DivMod optimization which fuses division and modulus operations if needed. The DivMod optimization shows 3x improvement for Integer and ~65% improvement for Long.
>
> Srinivas Vamsi Parasa has updated the pull request incrementally with one additional commit since the last revision:
> 
>   uncomment zero in integer div, mod test

My suggestion is to keep the -ve path assembly optimization in this patch.
When the optimization in IR is introduced, the assembly could then be simplified as suggested by @merykitty.

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PR: https://git.openjdk.java.net/jdk/pull/7572