Landing: 6f3c04e20625

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Project / Subsystem

gcc / uncprop

Date

2026-05-16

Author

Andrew Pinski

Commit

6f3c04e20625dee7c32b1ec43cb0812e38f4394b

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: uncprop
patch_id: —
commit_hash: 6f3c04e20625dee7c32b1ec43cb0812e38f4394b
source_type: github
headline: Uncprop: 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, improving compile time.
author: Andrew Pinski
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• compile time
• switch statement
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/6f3c04e20625dee7c32b1ec43cb0812e38f4394b
date: 2026-05-16T00:00:00.000Z

The compiler’s unconstrained propagation pass 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.