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Add CodeGen support for functions that always return arguments via a new parameter attribute 'returned', which is taken advantage of in target-independent tail call opportunity detection and in ARM call lowering (when placed on an integral first parameter).

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179925 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Stephen Lin
2013-04-20 05:14:40 +00:00
parent 5c34e08b9f
commit 456ca048af
20 changed files with 371 additions and 43 deletions
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7
lib/IR/Function.cpp
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@ -124,6 +124,13 @@ bool Argument::hasStructRetAttr() const {
hasAttribute(1, Attribute::StructRet);
}
/// hasReturnedAttr - Return true if this argument has the returned attribute on
/// it in its containing function.
bool Argument::hasReturnedAttr() const {
return getParent()->getAttributes().
hasAttribute(getArgNo()+1, Attribute::Returned);
}
/// addAttr - Add attributes to an argument.
void Argument::addAttr(AttributeSet AS) {
assert(AS.getNumSlots() <= 1 &&