Landing: 6a3f305b2984

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Project / Subsystem

gcc / lto

Date

2026-05-11

Author

Michal Jires

Commit

6a3f305b298438091ef45f92553618d92a47f8dd

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: lto
patch_id: —
commit_hash: 6a3f305b298438091ef45f92553618d92a47f8dd
source_type: github
headline: LTO: Fix cache partitioning to handle zero min partition size
tldr: Prevents division-by-zero errors in LTO cache partitioning when minimum partition size is zero.
author: Michal Jires
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • lto
• compiler
• optimization
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/6a3f305b298438091ef45f92553618d92a47f8dd
date: 2026-05-11T00:00:00.000Z

The Link-Time Optimization (LTO) cache partitioning feature in GCC previously asserted that both minimum and maximum partition sizes must be non-zero. This commit relaxes that restriction by handling a min_partition_size of 0. Instead of asserting, it clamps the value to 1, preventing potential division-by-zero errors and allowing for reasonable default behavior in such cases. A new test case is added to verify this fix.