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Enable tail call optimization for functions that return a struct (bug 3664) and for functions that return types that need extending (e.g i1).

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67934 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnold Schwaighofer
2009-03-28 08:33:27 +00:00
parent 1717f3af08
commit e75fd69f15
4 changed files with 37 additions and 12 deletions
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13
include/llvm/Target/TargetLowering.h
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@@ -1206,18 +1206,7 @@ public:
/// preceeds the RET node and whether the return uses the result of the node
/// or is a void return. This function can be used by the target to determine
/// eligiblity of tail call optimization.
static bool CheckTailCallReturnConstraints(CallSDNode *TheCall, SDValue Ret) {
unsigned NumOps = Ret.getNumOperands();
if ((NumOps == 1 &&
(Ret.getOperand(0) == SDValue(TheCall,1) ||
Ret.getOperand(0) == SDValue(TheCall,0))) ||
(NumOps > 1 &&
Ret.getOperand(0) == SDValue(TheCall,
TheCall->getNumValues()-1) &&
Ret.getOperand(1) == SDValue(TheCall,0)))
return true;
return false;
}
static bool CheckTailCallReturnConstraints(CallSDNode *TheCall, SDValue Ret);
/// GetPossiblePreceedingTailCall - Get preceeding TailCallNodeOpCode node if
/// it exists. Skip a possible ISD::TokenFactor.