Landing: 29605ae65965

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Project / Subsystem

gcc / gccrs

Date

2026-08-29

Author

Yap Zhi Heng

Commit

29605ae6596503a587700d854e2dbdd994cbaa61

Source

github

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Breaking

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All attributes

project: gcc
subsystem: gccrs
patch_id: —
commit_hash: 29605ae6596503a587700d854e2dbdd994cbaa61
source_type: github
headline: gccrs: Implement adapters for compiling LLVM builtins with GCC builtins
tldr: gccrs now adapts LLVM builtin signatures to GCC builtin signatures for certain functions.
author: Yap Zhi Heng
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • gccrs
• rust
• builtins
• compiler
• x86
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/29605ae6596503a587700d854e2dbdd994cbaa61
date: 2026-08-29T00:00:00.000Z

gccrs implements 1-to-1 adapters to translate LLVM builtin function signatures into GCC builtin signatures. This commit specifically handles cases involving FORWARD_ARGUMENTS, enabling functions like llvm.addcarryx.u32 and llvm.addcarryx.u64 to be compiled by mapping them to their __builtin_ia32_ equivalents. Adapters for SIMD-related builtins are included but currently unused as gccrs does not yet support SIMD types.