Don't add an attribute that already exists and don't remove an attribute that doesn't exist.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176289 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/IR/Attributes.cpp b/lib/IR/Attributes.cpp
index 6eb51f0..ed2bf05 100644
--- a/lib/IR/Attributes.cpp
+++ b/lib/IR/Attributes.cpp
@@ -645,6 +645,7 @@
AttributeSet AttributeSet::addAttribute(LLVMContext &C, unsigned Idx,
Attribute::AttrKind Attr) const {
+ if (hasAttribute(Idx, Attr)) return *this;
return addAttributes(C, Idx, AttributeSet::get(C, Idx, Attr));
}
@@ -699,6 +700,7 @@
AttributeSet AttributeSet::removeAttribute(LLVMContext &C, unsigned Idx,
Attribute::AttrKind Attr) const {
+ if (!hasAttribute(Idx, Attr)) return *this;
return removeAttributes(C, Idx, AttributeSet::get(C, Idx, Attr));
}