Landing: 439f966973a7

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Project / Subsystem

gcc / combine

Date

2026-05-07

Author

Richard Sandiford

Commit

439f966973a77f97f6c015cde6a9507e3be9f620

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: combine
patch_id: —
commit_hash: 439f966973a77f97f6c015cde6a9507e3be9f620
source_type: github
headline: combine: Improve PLUS/MINUS cases in make_compound_operation.
tldr: The combine pass now uses simplify_gen_binary for PLUS/MINUS in make_compound_operation to improve simplification and operand ordering.
author: Richard Sandiford
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • combine
• optimization
• simplification
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/439f966973a77f97f6c015cde6a9507e3be9f620
date: 2026-05-07T00:00:00.000Z

The make_compound_operation function in the combine pass has been updated to use simplify_gen_binary for handling PLUS and MINUS operations. This resolves issues where simplifications were discarded and operand ordering was incorrect for nested PLUS expressions. This change ensures that expressions are simplified more effectively and that operands are redistributed correctly in nested operations, improving generated code.