================
@@ -4598,8 +4602,7 @@ LValue CodeGenFunction::EmitLValueForField(LValue base,
if (base.getTBAAInfo().isMayAlias() ||
rec->hasAttr<MayAliasAttr>() || FieldType->isVectorType()) {
FieldTBAAInfo = TBAAAccessInfo::getMayAliasInfo();
- } else if (rec->isUnion()) {
- // TODO: Support TBAA for unions.
+ } else if (rec->isUnion() && !CGM.getCodeGenOpts().UnionTBAA) {
----------------
dybv-sc wrote:
The goal of that patch is to re-utilize existing struct path TBAA metadata and
amend it functionality to work for union types. Here I allow for that metadata
to be generated for union members accesses, so yes there will be tbaa struct
records with all members with offset 0. Later in code I adapted current
struct-path-tbaa tree walkers to handle such situations where multiple fields
have same offset.
https://github.com/llvm/llvm-project/pull/75177
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