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Tracking issue for LLVM align attributes (-Z arg_align_attributes) #49185

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scottmcm opened this issue Mar 19, 2018 · 1 comment
Closed

Tracking issue for LLVM align attributes (-Z arg_align_attributes) #49185

scottmcm opened this issue Mar 19, 2018 · 1 comment
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A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-tracking-issue Category: A tracking issue for an RFC or an unstable feature. I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@scottmcm
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In theory we should be emitting LLVM align <n> attributes (https://llvm.org/docs/LangRef.html#attr-align) for references, since they're always aligned.

However, it turns out that these get inlined as assume calls, which (per the HACK comment in the code) block other optimizations, so they're currently disabled.

-Z flag was added in #49122
@scottmcm scottmcm mentioned this issue Mar 19, 2018
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@sanxiyn sanxiyn added the C-tracking-issue Category: A tracking issue for an RFC or an unstable feature. label Mar 20, 2018
@nikic nikic added the A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. label Dec 20, 2018
@jonas-schievink jonas-schievink added T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. A-codegen Area: Code generation C-enhancement Category: An issue proposing an enhancement or a PR with one. I-slow Issue: Problems and improvements with respect to performance of generated code. and removed C-enhancement Category: An issue proposing an enhancement or a PR with one. labels Nov 26, 2019
@nikic
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nikic commented Mar 26, 2020

This flag has already been removed quite a while ago in #57021, so closing this.

@nikic nikic closed this as completed Mar 26, 2020
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A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-tracking-issue Category: A tracking issue for an RFC or an unstable feature. I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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@sanxiyn @nikic @jonas-schievink @scottmcm