Landing: 1ab177078102

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Project / Subsystem

gcc / match.pd

Date

2026-05-07

Author

Eikansh Gupta

Commit

1ab177078102ad62011bb66777c059dd6cac2bce

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: match.pd
patch_id: —
commit_hash: 1ab177078102ad62011bb66777c059dd6cac2bce
source_type: github
headline: match.pd: fold (X - (X<0)) ^ -(X<0) into ABS_EXPR<X>.
tldr: A new match.pd pattern folds (X - (X<0)) ^ -(X<0) into ABS_EXPR<X>.
author: Eikansh Gupta
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• pattern matching
• tree-ssa
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/1ab177078102ad62011bb66777c059dd6cac2bce
date: 2026-05-07T00:00:00.000Z

A new pattern has been added to match.pd to fold the expression (x - (x<0)) ^ -(x<0) into ABS_EXPR. This simplifies the code by directly representing the absolute value of x, potentially improving performance.