================
@@ -498,3 +498,137 @@
CodeGenTBAA::mergeTBAAInfoForMemoryTransfer(TBAAAccessInfo DestInfo,
// access type regardless of their base types.
return TBAAAccessInfo::getMayAliasInfo();
}
+
+// Determine the aliasing kind bit-converting from type Src to type Dst.
+CodeGenTBAA::AliasingKind CodeGenTBAA::getAliasingKind(QualType &Dst,
+ QualType &Src) {
+ assert(!Src->isVoidType() && !Dst->isVoidType());
+ if (TypeHasMayAlias(Src) || TypeHasMayAlias(Dst))
+ return AK_Ok;
+
+ Src = QualType{Src->getBaseElementTypeUnsafe(), 0};
+ Dst = QualType{Dst->getBaseElementTypeUnsafe(), 0};
+
+ auto *SrcDecl = Src->getAsRecordDecl();
+ auto *DstDecl = Dst->getAsRecordDecl();
+
+ const llvm::MDNode *AnyTBAA = getChar();
+ const llvm::MDNode *SrcTBAA = nullptr;
+ const llvm::MDNode *DstTBAA = nullptr;
+
+ if (!SrcDecl) {
+ SrcTBAA = getTypeInfo(Src);
+ if (!SrcTBAA || SrcTBAA == AnyTBAA)
+ return AK_Ok;
+ }
+ if (!DstDecl) {
+ DstTBAA = getTypeInfo(Dst);
+ if (!DstTBAA || DstTBAA == AnyTBAA)
+ return AK_Ok;
+ }
+
+ auto IsAncestor = [](const llvm::MDNode *Ancestor,
+ const llvm::MDNode *Descendant) {
+ assert(Ancestor != Descendant && "Identical TBAA");
+ while (Descendant->getNumOperands() != 1) {
+ Descendant = cast<llvm::MDNode>(Descendant->getOperand(1));
+ if (Descendant == Ancestor)
+ return true;
+ }
+ return false;
+ };
+
+ assert(SrcTBAA != AnyTBAA && DstTBAA != AnyTBAA &&
----------------
Endilll wrote:
Sure, I'm not insisting.
https://github.com/llvm/llvm-project/pull/74155
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