AutoUpgrade: upgrade from scalar TBAA format to struct-path aware TBAA format.
We treat TBAA tags as struct-path aware TBAA format when the first operand
is a MDNode and the tag has 3 or more operands.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191593 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/IR/AutoUpgrade.cpp b/lib/IR/AutoUpgrade.cpp
index a4f5289..9839b06 100644
--- a/lib/IR/AutoUpgrade.cpp
+++ b/lib/IR/AutoUpgrade.cpp
@@ -391,3 +391,30 @@
}
}
+void llvm::UpgradeInstWithTBAATag(Instruction *I) {
+ MDNode *MD = I->getMetadata(LLVMContext::MD_tbaa);
+ assert(MD && "UpgradeInstWithTBAATag should have a TBAA tag");
+ // Check if the tag uses struct-path aware TBAA format.
+ if (isa<MDNode>(MD->getOperand(0)) && MD->getNumOperands() >= 3)
+ return;
+
+ if (MD->getNumOperands() == 3) {
+ Value *Elts[] = {
+ MD->getOperand(0),
+ MD->getOperand(1)
+ };
+ MDNode *ScalarType = MDNode::get(I->getContext(), Elts);
+ // Create a MDNode <ScalarType, ScalarType, offset 0, const>
+ Value *Elts2[] = {
+ ScalarType, ScalarType,
+ Constant::getNullValue(Type::getInt64Ty(I->getContext())),
+ MD->getOperand(2)
+ };
+ I->setMetadata(LLVMContext::MD_tbaa, MDNode::get(I->getContext(), Elts2));
+ } else {
+ // Create a MDNode <MD, MD, offset 0>
+ Value *Elts[] = {MD, MD,
+ Constant::getNullValue(Type::getInt64Ty(I->getContext()))};
+ I->setMetadata(LLVMContext::MD_tbaa, MDNode::get(I->getContext(), Elts));
+ }
+}