symfony/symfony — pull request #8891 by tgabi333 (2013-08-30 11:13:11+00:00)
Title: [DependencyInjection] optimized circular reference checker

| Q | A
| ------------- | ---
| Bug fix? | [no]
| New feature? | [no]
| BC breaks? | [no]
| Deprecations? | no]
| Tests pass? | [yes]
| Fixed tickets | []
| License | MIT
| Doc PR | []

It is an addtion to my previous PR https://github.com/symfony/symfony/pull/7699

There is no need to check again previously checked sub-trees.

In our tightly coupled services graph, this circular reference check runs avg 1,5ms, before that: 100ms