Extend 'readonly' and 'readnone' to work on function arguments as well as
functions. Make the function attributes pass add it to known library functions
and when it can deduce it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185735 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/IR/Function.cpp b/lib/IR/Function.cpp
index 7f7efabf..bf9d949 100644
--- a/lib/IR/Function.cpp
+++ b/lib/IR/Function.cpp
@@ -131,6 +131,15 @@
hasAttribute(getArgNo()+1, Attribute::Returned);
}
+/// Return true if this argument has the readonly or readnone attribute on it
+/// in its containing function.
+bool Argument::onlyReadsMemory() const {
+ return getParent()->getAttributes().
+ hasAttribute(getArgNo()+1, Attribute::ReadOnly) ||
+ getParent()->getAttributes().
+ hasAttribute(getArgNo()+1, Attribute::ReadNone);
+}
+
/// addAttr - Add attributes to an argument.
void Argument::addAttr(AttributeSet AS) {
assert(AS.getNumSlots() <= 1 &&
@@ -711,4 +720,3 @@
return false;
}
-