Landing: 8837b1d542fb

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Project / Subsystem

gcc / bitintlower

Date

2026-07-14

Author

Jakub Jelinek

Commit

8837b1d542fb685da3b36176a0bd82a46f472b80

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: bitintlower
patch_id: —
commit_hash: 8837b1d542fb685da3b36176a0bd82a46f472b80
source_type: github
headline: bitintlower: Handle ASAN POISON/POISON_USE with large _BitInt.
tldr: Ensures AddressSanitizer poison markers work correctly with large _BitInt types.
author: Jakub Jelinek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • asan
• bitint
• compiler
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/8837b1d542fb685da3b36176a0bd82a46f472b80
date: 2026-07-14T00:00:00.000Z

This commit addresses an issue where the bitintlower pass did not correctly handle AddressSanitizer’s internal .ASAN_POISON and .ASAN_POISON_USE markers when applied to large or huge _BitInt types. Previously, this led to invalid intermediate representation. The fix integrates the necessary handling for these ASan markers directly into the bitintlower pass, ensuring proper sanitization for _BitInt types and fixing PR126084.