Landing: 255207b2ce61

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Project / Subsystem

gcc / gcc/range-op-float

Date

2026-08-07

Author

Jakub Jelinek

Commit

255207b2ce6168cd9620980d448dc23e2488de7f

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: gcc/range-op-float
patch_id: —
commit_hash: 255207b2ce6168cd9620980d448dc23e2488de7f
source_type: github
headline: Fix float_widen_lhs_range for float range operations
tldr: Corrected float range widening to prevent overflows and ensure valid range calculations in floating-point operations.
author: Jakub Jelinek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• floating-point
• compiler
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/255207b2ce6168cd9620980d448dc23e2488de7f
date: 2026-08-07T00:00:00.000Z

The float_widen_lhs_range function in GCC’s floating-point range analysis has been fixed to prevent potential overflows when extending ranges. The function now correctly handles cases where it’s called with significand bits, ensuring that the widened range remains valid. This change rectifies issues in optimizations like PR109008 and improves the robustness of floating-point range operations, especially when interacting with frange_nextafter.