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FORTRAN!!! :( and other similarly unfortunate things mean that on ia64

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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
This commit is contained in:
Duraid Madina 2005-11-01 05:46:16 +00:00
parent aba8457125
commit dc9549b52c
1 changed files with 20 additions and 0 deletions
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20
lib/Target/IA64/IA64ISelDAGToDAG.cpp
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@ -208,7 +208,13 @@ SDOperand IA64DAGToDAGISel::SelectCALL(SDOperand Op) {
CallOpcode = IA64::BRCALL_INDIRECT;
}
// see section 8.5.8 of "Itanium Software Conventions and
// Runtime Architecture Guide to see some examples of what's going
// on here. (in short: int args get mapped 1:1 'slot-wise' to out0->out7,
// while FP args get mapped to F8->F15 as needed)
// TODO: support in-memory arguments
unsigned used_FPArgs=0; // how many FP args have been used so far?
unsigned intArgs[] = {IA64::out0, IA64::out1, IA64::out2, IA64::out3,
@ -236,6 +242,20 @@ SDOperand IA64DAGToDAGISel::SelectCALL(SDOperand Op) {
Chain = CurDAG->getCopyToReg(Chain, DestReg, Val, InFlag);
InFlag = Chain.getValue(1);
CallOperands.push_back(CurDAG->getRegister(DestReg, RegTy));
// some functions (e.g. printf) want floating point arguments
// *also* passed as in-memory representations in integer registers
// this is FORTRAN legacy junk which we don't _always_ need
// to do, but to be on the safe side, we do.
if(MVT::isFloatingPoint(N->getOperand(i).getValueType())) {
assert((i-2) < 8 && "FP args alone would fit, but no int regs left");
DestReg = intArgs[i-2]; // this FP arg goes in an int reg
// GETFD takes an FP reg and writes a GP reg
Chain = CurDAG->getTargetNode(IA64::GETFD, MVT::i64, Val, InFlag);
// FIXME: this next line is a bit unfortunate
Chain = CurDAG->getCopyToReg(Chain, DestReg, Chain, InFlag);
InFlag = Chain.getValue(1);
CallOperands.push_back(CurDAG->getRegister(DestReg, MVT::i64));
}
}
}