Integrated: 8278114: New addnode ideal optimization: converting "x + x" into "x << 1"

[Zhiqiang Zang]

On Thu, 2 Dec 2021 15:20:08 GMT, Zhiqiang Zang <duke at openjdk.java.net> wrote:

> A new ideal optimization can be introduced for addnode: converting "x + x" into "x << 1".
> 
> 
> // Convert "x + x" into "x << 1"
> if (in1 == in2) {
>   return new LShiftINode(in1, phase->intcon(1));
> }

This pull request has now been integrated.

Changeset: f3263053
Author:    Zhiqiang Zang <zhiqiang.zang at utexas.edu>
Committer: Vladimir Kozlov <kvn at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/f3263053963451637258f9d318e7b93b79fcce54
Stats:     272 lines in 4 files changed: 263 ins; 0 del; 9 mod

8278114: New addnode ideal optimization: converting "x + x" into "x << 1"

Reviewed-by: kvn, redestad

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PR: https://git.openjdk.java.net/jdk/pull/6675