Landing: 14665d8a97e5

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Project / Subsystem

gcc / ifcvt

Date

2026-08-31

Author

wangjue

Commit

14665d8a97e566c6fefe38f843c1377338b8cbe1

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: ifcvt
patch_id: —
commit_hash: 14665d8a97e566c6fefe38f843c1377338b8cbe1
source_type: github
headline: Handle extended conditional arithmetic in ifcvt.
tldr: Conditional arithmetic with sign/zero extensions now handled correctly.
author: wangjue
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• if-conversion
• risc-v
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/14665d8a97e566c6fefe38f843c1377338b8cbe1
date: 2026-08-31T00:00:00.000Z

The ifcvt (if-conversion) pass has been improved to handle conditional arithmetic operations that are wrapped in sign or zero extensions. The compiler now correctly identifies when the unchanged value of such an operation already has the necessary extension. This is achieved by directly querying the promoted lowpart, rather than searching for its definition, leading to more robust code generation for conditional arithmetic, particularly on architectures like RISC-V.