Landing: 7459f9136500

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Project / Subsystem

gcc / gcc/tree-ssa

Date

2026-07-21

Author

Kyrylo Tkachov

Commit

7459f9136500bfb881902834d56fb110b77909f2

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: gcc/tree-ssa
patch_id: —
commit_hash: 7459f9136500bfb881902834d56fb110b77909f2
source_type: github
headline: Preserve DECL_IGNORED_P for split partition declarations in out-of-SSA
tldr: The out-of-SSA pass now correctly preserves the `DECL_IGNORED_P` flag for split partition declarations, fixing potential register allocation issues at -O0.
author: Kyrylo Tkachov
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • gcc
• compiler
• optimization
• ssa
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/7459f9136500bfb881902834d56fb110b77909f2
date: 2026-07-21T00:00:00.000Z

The out-of-SSA transformation pass has been updated to correctly preserve the DECL_IGNORED_P flag when splitting overlapping partition declarations. This is particularly important at optimization level -O0, where incorrect handling of this flag could cause a replacement declaration to be allocated to a pseudo-register instead of memory, leading to conflicts. The change ensures that storage choices made during register coalescing are maintained, preventing issues with memory invariants.