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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).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67934 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1206,18 +1206,7 @@ public:
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/// preceeds the RET node and whether the return uses the result of the node
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/// or is a void return. This function can be used by the target to determine
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/// eligiblity of tail call optimization.
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static bool CheckTailCallReturnConstraints(CallSDNode *TheCall, SDValue Ret) {
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unsigned NumOps = Ret.getNumOperands();
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if ((NumOps == 1 &&
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(Ret.getOperand(0) == SDValue(TheCall,1) ||
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Ret.getOperand(0) == SDValue(TheCall,0))) ||
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(NumOps > 1 &&
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Ret.getOperand(0) == SDValue(TheCall,
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TheCall->getNumValues()-1) &&
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Ret.getOperand(1) == SDValue(TheCall,0)))
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return true;
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return false;
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}
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static bool CheckTailCallReturnConstraints(CallSDNode *TheCall, SDValue Ret);
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/// GetPossiblePreceedingTailCall - Get preceeding TailCallNodeOpCode node if
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/// it exists. Skip a possible ISD::TokenFactor.
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@ -2571,3 +2571,27 @@ SDValue TargetLowering::BuildUDIV(SDNode *N, SelectionDAG &DAG,
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DAG.getConstant(magics.s-1, getShiftAmountTy()));
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}
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}
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bool TargetLowering::CheckTailCallReturnConstraints(CallSDNode *TheCall, SDValue Ret) {
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unsigned NumOps = Ret.getNumOperands();
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// Struct return.
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if(NumOps >= 5&&
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Ret.getOperand(1).getOpcode()==ISD::MERGE_VALUES &&
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Ret.getOperand(1).getOperand(0) == SDValue(TheCall, 0))
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return true;
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if ((NumOps == 1 &&
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(Ret.getOperand(0) == SDValue(TheCall,1) ||
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Ret.getOperand(0) == SDValue(TheCall,0))) ||
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(NumOps == 3 &&
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Ret.getOperand(1).getOpcode() == ISD::ANY_EXTEND &&
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Ret.getOperand(1).getNumOperands()>0 &&
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Ret.getOperand(1).getOperand(0).getOpcode() == ISD::TRUNCATE &&
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Ret.getOperand(1).getOperand(0).getNumOperands()>0 &&
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Ret.getOperand(1).getOperand(0).getOperand(0) == SDValue(TheCall, 0)) ||
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(NumOps > 1 &&
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Ret.getOperand(0) == SDValue(TheCall,
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TheCall->getNumValues()-1) &&
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Ret.getOperand(1) == SDValue(TheCall,0)))
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return true;
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return false;
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}
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6
test/CodeGen/X86/tailcall-i1.ll
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6
test/CodeGen/X86/tailcall-i1.ll
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@ -0,0 +1,6 @@
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; RUN: llvm-as < %s | llc -march=x86 -tailcallopt | grep TAILCALL
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define fastcc i1 @i1test(i32, i32, i32, i32) {
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entry:
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%4 = tail call fastcc i1 @i1test( i32 %0, i32 %1, i32 %2, i32 %3)
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ret i1 %4
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}
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6
test/CodeGen/X86/tailcall-structret.ll
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6
test/CodeGen/X86/tailcall-structret.ll
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@ -0,0 +1,6 @@
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; RUN: llvm-as < %s | llc -march=x86 -tailcallopt | grep TAILCALL
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define fastcc { { i8*, i8* }*, i8*} @init({ { i8*, i8* }*, i8*}, i32) {
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entry:
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%2 = tail call fastcc { { i8*, i8* }*, i8* } @init({ { i8*, i8*}*, i8*} %0, i32 %1)
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ret { { i8*, i8* }*, i8*} %2
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}
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