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FORTRAN!!! :( and other similarly unfortunate things mean that on ia64
one sometimes needs to pass FP args in both FP *and* integer registers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24134 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -208,7 +208,13 @@ SDOperand IA64DAGToDAGISel::SelectCALL(SDOperand Op) {
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CallOpcode = IA64::BRCALL_INDIRECT;
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CallOpcode = IA64::BRCALL_INDIRECT;
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}
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}
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// see section 8.5.8 of "Itanium Software Conventions and
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// Runtime Architecture Guide to see some examples of what's going
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// on here. (in short: int args get mapped 1:1 'slot-wise' to out0->out7,
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// while FP args get mapped to F8->F15 as needed)
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// TODO: support in-memory arguments
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// TODO: support in-memory arguments
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unsigned used_FPArgs=0; // how many FP args have been used so far?
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unsigned used_FPArgs=0; // how many FP args have been used so far?
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unsigned intArgs[] = {IA64::out0, IA64::out1, IA64::out2, IA64::out3,
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unsigned intArgs[] = {IA64::out0, IA64::out1, IA64::out2, IA64::out3,
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@ -236,6 +242,20 @@ SDOperand IA64DAGToDAGISel::SelectCALL(SDOperand Op) {
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Chain = CurDAG->getCopyToReg(Chain, DestReg, Val, InFlag);
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Chain = CurDAG->getCopyToReg(Chain, DestReg, Val, InFlag);
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InFlag = Chain.getValue(1);
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InFlag = Chain.getValue(1);
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CallOperands.push_back(CurDAG->getRegister(DestReg, RegTy));
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CallOperands.push_back(CurDAG->getRegister(DestReg, RegTy));
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// some functions (e.g. printf) want floating point arguments
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// *also* passed as in-memory representations in integer registers
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// this is FORTRAN legacy junk which we don't _always_ need
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// to do, but to be on the safe side, we do.
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if(MVT::isFloatingPoint(N->getOperand(i).getValueType())) {
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assert((i-2) < 8 && "FP args alone would fit, but no int regs left");
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DestReg = intArgs[i-2]; // this FP arg goes in an int reg
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// GETFD takes an FP reg and writes a GP reg
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Chain = CurDAG->getTargetNode(IA64::GETFD, MVT::i64, Val, InFlag);
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// FIXME: this next line is a bit unfortunate
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Chain = CurDAG->getCopyToReg(Chain, DestReg, Chain, InFlag);
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InFlag = Chain.getValue(1);
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CallOperands.push_back(CurDAG->getRegister(DestReg, MVT::i64));
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}
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}
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}
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}
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}
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