Landing: cd9428362b65

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Project / Subsystem

gcc / bitintlower

Date

2026-07-29

Author

Jakub Jelinek

Commit

cd9428362b6585e77ea2a171ec030894fcfa4d1c

Source

github

Perf win

No

Breaking

No

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All attributes

project: gcc
subsystem: bitintlower
patch_id: —
commit_hash: cd9428362b6585e77ea2a171ec030894fcfa4d1c
source_type: github
headline: bitintlower: Fix _BitInt SSA_NAME coalescing ICE [PR126447]
tldr: Fixes compiler ICE related to _BitInt SSA_NAME coalescing with abnormal PHI nodes.
author: Jakub Jelinek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • bitint
• _BitInt
• compiler bug
• optimization
• ssa
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/cd9428362b6585e77ea2a171ec030894fcfa4d1c
date: 2026-07-29T00:00:00.000Z

This commit addresses an Internal Compiler Error (ICE) occurring in the bitintlower pass when handling _BitInt types and coalescing SSA_NAMEs. The issue arises when muldiv_p is incorrectly set to true for certain internal function calls, preventing the coalescing of the left-hand side (lhs) with its operands, particularly when operands are SSA_NAMEs involved in abnormal PHI nodes. The fix ensures that for such cases, new SSA_NAMEs are created for the operands, preventing coalescing failures and resolving the ICE.