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[LangRef] Add description of toc-data global variables #94828

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Add description of toc-data global variables
Jun 8, 2024
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Jun 8, 2024
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4 changes: 4 additions & 0 deletions llvm/docs/LangRef.rst
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Expand Up @@ -812,6 +812,10 @@ doesn't). These kinds of structs (we may call them homogeneous scalable vector
structs) are considered sized and can be used in loads, stores, allocas, but
not GEPs.

Globals with ``toc-data`` attribute set are stored in TOC of XCOFF. Their
alignments are not larger than that of a TOC entry. Optimizations should not
increase their alignments to prevent TOC overflow.

Syntax::

@<GlobalVarName> = [Linkage] [PreemptionSpecifier] [Visibility]
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