Landing: 3b126071b10e

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Project / Subsystem

gcc / middle-end

Date

2026-07-23

Author

Odysseas Georgoudis

Commit

3b126071b10e5b12e7694f7a237f746e8db6d82c

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: middle-end
patch_id: —
commit_hash: 3b126071b10e5b12e7694f7a237f746e8db6d82c
source_type: github
headline: Fold averages with equal operands
tldr: Optimizes average calculations by folding identical operands into a direct result.
author: Odysseas Georgoudis
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• middle-end
• constant folding
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/3b126071b10e5b12e7694f7a237f746e8db6d82c
date: 2026-07-23T00:00:00.000Z

The GCC middle-end now performs a constant folding optimization for average calculations where both operands are identical. Expressions like IFN_AVG_FLOOR(x, x) and IFN_AVG_CEIL(x, x) are now correctly simplified to just x, reducing redundant computations.