RFR: 8273021: C2: Improve Add and Xor ideal optimizations [v3]

[Yi Yang]

On Mon, 6 Sep 2021 04:24:19 GMT, Eric Liu <eliu at openjdk.org> wrote:

>> Yi Yang has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - dontinline
>>  - more random
>
> src/hotspot/share/opto/addnode.cpp line 1011:
> 
>> 1009:   // be -1^(x+(-1)).
>> 1010:   if (op1 == Op_AddI && phase->type(in2) == TypeInt::MINUS_1) {
>> 1011:     if (phase->type(in1->in(2)) == TypeInt::MINUS_1) {
> 
> These two conditions could be combined.

Yes, I've combined these conditions.

-------------

PR: https://git.openjdk.java.net/jdk/pull/5266