Treat sret arguments as being dereferenceable in getPointerDereferenceableBytes()
Reviewers: rnk, hfinkel, efriedma
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D41355
llvm-svn: 321061
diff --git a/llvm/lib/IR/Value.cpp b/llvm/lib/IR/Value.cpp
index eae697b..d36b7cd 100644
--- a/llvm/lib/IR/Value.cpp
+++ b/llvm/lib/IR/Value.cpp
@@ -627,9 +627,10 @@
CanBeNull = false;
if (const Argument *A = dyn_cast<Argument>(this)) {
DerefBytes = A->getDereferenceableBytes();
- if (DerefBytes == 0 && A->hasByValAttr()) {
+ if (DerefBytes == 0 && (A->hasByValAttr() || A->hasStructRetAttr())) {
Type *PT = cast<PointerType>(A->getType())->getElementType();
- DerefBytes = DL.getTypeStoreSize(PT);
+ if (PT->isSized())
+ DerefBytes = DL.getTypeStoreSize(PT);
}
if (DerefBytes == 0) {
DerefBytes = A->getDereferenceableOrNullBytes();