Landing: 962723b046ae

← All landings

Project / Subsystem

gcc / c

Date

2026-10-02

Author

Dominic P

Commit

962723b046ae6406c0c457bfdb76318b3652673f

Source

github

Perf win

No

Breaking

No

View on GitHub →

All attributes

project: gcc
subsystem: c
patch_id: —
commit_hash: 962723b046ae6406c0c457bfdb76318b3652673f
source_type: github
headline: C: Fix excess precision handling for logical NOT operator
tldr: Correctly handles excess precision for the result of the logical NOT operator (!), preventing compiler errors with types like _Float16.
author: Dominic P
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • c
• type handling
• excess precision
• compiler bug
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/962723b046ae6406c0c457bfdb76318b3652673f
date: 2026-10-02T00:00:00.000Z

This commit fixes an issue where the C frontend incorrectly re-wrapped the result of the logical NOT operator (!) in an EXCESS_PRECISION_EXPR, even though the result of ! is always an int. This caused problems with types like _Float16 or when x87 excess precision was enabled, leading to incorrect sizeof results, ICEs in build_conditional_expr, or ICEs at the expansion stage. The fix prevents re-wrapping the result of TRUTH_NOT_EXPR while still testing the operand at its excess precision.