From c2ec0725cedceb851858c3991fbdd36ee9ac85dd Mon Sep 17 00:00:00 2001 From: Nick Lewycky Date: Sat, 6 Jul 2013 00:29:58 +0000 Subject: 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. llvm-svn: 185735 --- llvm/lib/IR/Function.cpp | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'llvm/lib/IR/Function.cpp') diff --git a/llvm/lib/IR/Function.cpp b/llvm/lib/IR/Function.cpp index 7f7efabf..bf9d949b 100644 --- a/llvm/lib/IR/Function.cpp +++ b/llvm/lib/IR/Function.cpp @@ -131,6 +131,15 @@ bool Argument::hasReturnedAttr() const { 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 @@ bool Function::callsFunctionThatReturnsTwice() const { return false; } - -- cgit v1.1