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LLVM 21: f128/i128 now 16-byte aligned on x86-32 #144606

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LLVM 21: f128/i128 now 16-byte aligned on x86-32#144606
#144632
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A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.O-x86_32Target: x86 processors, 32 bit (like i686-*) (also known as IA-32, i386, i586, i686)T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.
@durin42

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@durin42
durin42
opened on Jul 28, 2025

This was fixed in llvm/llvm-project#138092, and broke tests/assembly-llvm/x86-return-float.rs in the process. It looks like this will be fidgety to try and fix for both versions, so I'm filing a tracking bug in the hopes it's easy to just accept the changes when it lands.

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    A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.O-x86_32Target: x86 processors, 32 bit (like i686-*) (also known as IA-32, i386, i586, i686)T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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