================
@@ -355,6 +351,13 @@ class alignas(8) Decl {
LLVM_PREFERRED_TYPE(Linkage)
mutable unsigned CacheValidAndLinkage : 3;
+ /// The attributes attached to this declaration, or null if it has none.
+ ///
+ /// This pointer is the sole record of whether the declaration has
+ /// attributes, so it must be cleared whenever the vector becomes empty.
+ /// Owned by the ASTContext that allocated it.
+ AttrVec *Attrs = nullptr;
----------------
zygoloid wrote:
As a cheap experiment, can you try putting back a padding bit where the old
`hasAttr` bit was and rerunning a comparison against the baseline? (So we're
measuring map versus storage-in-Decl, and not treating the Decl storage as
free.) That should give us a quick idea of what proportion of Decls actually
end up with a non-null attribute pointer, without "cheating" by reusing the
padding bits in Decl that are only there by accident.
https://github.com/llvm/llvm-project/pull/219138
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