Landing: d172a9666d42

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Project / Subsystem

gcc / gcc

Date

2026-06-10

Author

Jakub Jelinek

Commit

d172a9666d4281355786062dcc958a64e28a292c

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: gcc
patch_id: —
commit_hash: d172a9666d4281355786062dcc958a64e28a292c
source_type: github
headline: Builtin `bswap` and `bitreverse` functions improve error recovery.
tldr: GCC now includes better error recovery for `__builtin_bswapg` and `__builtin_bitreverseg` when passed invalid arguments, preventing internal compiler errors.
author: Jakub Jelinek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • c
• c++
• bugfix
• builtins
• error-handling
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/d172a9666d4281355786062dcc958a64e28a292c
date: 2026-06-10T00:00:00.000Z

GCC has improved its error handling for the __builtin_bswapg and __builtin_bitreverseg functions by preventing an Internal Compiler Error (ICE) when these builtins are invoked with error_mark_node as an argument. The fix ensures that the compiler now explicitly checks for error_operand_p before attempting to access the argument’s type, providing more robust error recovery in C and C++ front ends and making the compiler more stable when dealing with malformed input.