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In TargetLowering::LowerCallTo, don't assert that

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the return value is zero-extended if it isn't
sign-extended.  It may also be any-extended.
Also, if a floating point value was returned
in a larger floating point type, pass 1 as the
second operand to FP_ROUND, which tells it
that all the precision is in the original type.
I think this is right but I could be wrong.
Finally, when doing libcalls, set isZExt on
a parameter if it is "unsigned".  Currently
isSExt is set when signed, and nothing is
set otherwise.  This should be right for all
calls to standard library routines.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47122 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
2008-02-14 17:28:50 +00:00
parent e179584f9b
commit 00fee65fd2
11 changed files with 62 additions and 38 deletions
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14
lib/Target/Alpha/AlphaISelLowering.cpp
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@@ -319,7 +319,7 @@ static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) {
std::pair<SDOperand, SDOperand>
AlphaTargetLowering::LowerCallTo(SDOperand Chain, const Type *RetTy,
bool RetTyIsSigned, bool isVarArg,
bool RetSExt, bool RetZExt, bool isVarArg,
unsigned CallingConv, bool isTailCall,
SDOperand Callee, ArgListTy &Args,
SelectionDAG &DAG) {
@@ -378,8 +378,16 @@ AlphaTargetLowering::LowerCallTo(SDOperand Chain, const Type *RetTy,
SDOperand RetVal = TheCall;
if (RetTyVT != ActualRetTyVT) {
RetVal = DAG.getNode(RetTyIsSigned ? ISD::AssertSext : ISD::AssertZext,
MVT::i64, RetVal, DAG.getValueType(RetTyVT));
ISD::NodeType AssertKind = ISD::DELETED_NODE;
if (RetSExt)
AssertKind = ISD::AssertSext;
else if (RetZExt)
AssertKind = ISD::AssertZext;
if (AssertKind != ISD::DELETED_NODE)
RetVal = DAG.getNode(AssertKind, MVT::i64, RetVal,
DAG.getValueType(RetTyVT));
RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal);
}