Landing: 26058933d2a2

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Project / Subsystem

gcc / x86

Date

2026-07-19

Author

H.J. Lu

Commit

26058933d2a23140131b3980908554fc6f8b1f41

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: x86
patch_id: —
commit_hash: 26058933d2a23140131b3980908554fc6f8b1f41
source_type: github
headline: Check callee-spilled register arguments on x86.
tldr: x86 calling convention now correctly accounts for register arguments spilled by the callee.
author: H.J. Lu
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • x86
• abi
• calling convention
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/26058933d2a23140131b3980908554fc6f8b1f41
date: 2026-07-19T00:00:00.000Z

The x86 calling convention logic has been updated to correctly handle register arguments that are spilled by the callee. Previously, the ix86_argument_passed_on_stack_p function ignored such spills, assuming the caller was responsible for stack alignment. A new function, ix86_spill_register_argument_p, is introduced to check for these callee-spills, improving stack argument handling accuracy and fixing PR target/126320.