RFR: 8292761: x86: Clone nodes to match complex rules [v3]

[Christian Hagedorn]

On Fri, 9 Sep 2022 11:18:50 GMT, Quan Anh Mai <duke at openjdk.org> wrote:

>> Hi,
>> 
>> This patch tries to clone a node if it can be matched as a part of a BMI and lea pattern. This may reduce the live range of a local or remove that local completely.
>> 
>> Please take a look and have some reviews. Thanks a lot.
>
> Quan Anh Mai has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 11 additional commits since the last revision:
> 
>  - add benchmark
>  - Merge branch 'master' into cloneSimpleNodes
>  - Merge branch 'master' into cloneSimpleNodes
>  - fix
>  - Merge branch 'master' into cloneSimpleNodes
>  - shorten
>  - improve checks
>  - lea patterns
>  - refactor
>  - lea patterns
>  - ... and 1 more: https://git.openjdk.org/jdk/compare/c48414e3...0beae979

src/hotspot/cpu/x86/x86.ad line 2445:

> 2443:     }
> 2444:   }
> 2445:   if (n->Opcode() == Op_AddL) {

Could be an `else if`

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PR: https://git.openjdk.org/jdk/pull/9977