diff options
| author | Chris Lattner <sabre@nondot.org> | 2005-09-01 23:44:32 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2005-09-01 23:44:32 +0000 |
| commit | 2a00daac5895879afdf14adf936cd93deaadbb99 (patch) | |
| tree | 45376fdf6ef62b98efac488bc2dd301ccbce3379 | |
| parent | 9832ce0f0a27dcc55266ce1008786206bcfa0f83 (diff) | |
Implement small-arguments.ll:test3 by teaching the DAG optimizer that
the results of calls to functions returning small values are properly
sign/zero extended.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23198 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/PowerPC/PPCISelLowering.cpp | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp index 5b77784819..8490adb3c3 100644 --- a/lib/Target/PowerPC/PPCISelLowering.cpp +++ b/lib/Target/PowerPC/PPCISelLowering.cpp @@ -613,8 +613,12 @@ PPC32TargetLowering::LowerCallTo(SDOperand Chain, std::vector<MVT::ValueType> RetVals; MVT::ValueType RetTyVT = getValueType(RetTy); + MVT::ValueType ActualRetTyVT = RetTyVT; + if (RetTyVT >= MVT::i1 && RetTyVT <= MVT::i16) + ActualRetTyVT = MVT::i32; // Promote result to i32. + if (RetTyVT != MVT::isVoid) - RetVals.push_back(RetTyVT); + RetVals.push_back(ActualRetTyVT); RetVals.push_back(MVT::Other); SDOperand TheCall = SDOperand(DAG.getCall(RetVals, @@ -622,7 +626,17 @@ PPC32TargetLowering::LowerCallTo(SDOperand Chain, Chain = TheCall.getValue(RetTyVT != MVT::isVoid); Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain, DAG.getConstant(NumBytes, getPointerTy())); - return std::make_pair(TheCall, Chain); + SDOperand RetVal = TheCall; + + // If the result is a small value, add a note so that we keep track of the + // information about whether it is sign or zero extended. + if (RetTyVT != ActualRetTyVT) { + RetVal = DAG.getNode(RetTy->isSigned() ? ISD::AssertSext : ISD::AssertZext, + MVT::i32, RetVal, DAG.getValueType(RetTyVT)); + RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal); + } + + return std::make_pair(RetVal, Chain); } SDOperand PPC32TargetLowering::LowerVAStart(SDOperand Chain, SDOperand VAListP, |