Landing: 09cb7c0e9dca

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Project / Subsystem

gcc / dom

Date

2026-05-15

Author

Andrew Pinski

Commit

09cb7c0e9dcab29232da92f1cc028454eec1c4c2

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: dom
patch_id: —
commit_hash: 09cb7c0e9dcab29232da92f1cc028454eec1c4c2
source_type: github
headline: Dom: Optimize compile time by storing only switch case values.
tldr: The compiler now stores only the case value instead of the entire CASE_LABEL_EXPR for switch statements in the dominator tree, improving compile time.
author: Andrew Pinski
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• compile time
• switch statement
• dominator tree
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/09cb7c0e9dcab29232da92f1cc028454eec1c4c2
date: 2026-05-15T00:00:00.000Z

The compiler’s dominator tree construction now stores only the value of switch case labels instead of the entire CASE_LABEL_EXPR. This reduces memory usage during compilation, which improves compile time. Comments were added to clarify the code.