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Implement (most of) selection of inline asm memory operands.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26350 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-02-24 02:13:54 +00:00
parent fd105d464a
commit 0e43f2ba11
1 changed files with 42 additions and 0 deletions
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42
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -2437,3 +2437,45 @@ void SelectionDAGISel::ScheduleAndEmitDAG(SelectionDAG &DAG) {
BB = SL->Run();
delete SL;
}
/// SelectInlineAsmMemoryOperands - Calls to this are automatically generated
/// by tblgen. Others should not call it.
void SelectionDAGISel::
SelectInlineAsmMemoryOperands(std::vector<SDOperand> &Ops, SelectionDAG &DAG) {
std::vector<SDOperand> InOps;
std::swap(InOps, Ops);
Ops.push_back(InOps[0]); // input chain.
Ops.push_back(InOps[1]); // input asm string.
const char *AsmStr = cast<ExternalSymbolSDNode>(InOps[1])->getSymbol();
unsigned i = 2, e = InOps.size();
if (InOps[e-1].getValueType() == MVT::Flag)
--e; // Don't process a flag operand if it is here.
while (i != e) {
unsigned Flags = cast<ConstantSDNode>(InOps[i])->getValue();
if ((Flags & 7) != 4 /*MEM*/) {
// Just skip over this operand, copying the operands verbatim.
Ops.insert(Ops.end(), InOps.begin()+i, InOps.begin()+i+(Flags >> 3) + 1);
i += (Flags >> 3) + 1;
} else {
assert((Flags >> 3) == 1 && "Memory operand with multiple values?");
// Otherwise, this is a memory operand. Ask the target to select it.
std::vector<SDOperand> SelOps;
if (SelectInlineAsmMemoryOperand(InOps[i+1], 'm', SelOps, DAG)) {
std::cerr << "Could not match memory address. Inline asm failure!\n";
exit(1);
}
// Add this to the output node.
Ops.push_back(DAG.getConstant(4/*MEM*/ | (SelOps.size() << 3), MVT::i32));
Ops.insert(Ops.end(), SelOps.begin(), SelOps.end());
i += 2;
}
}
// Add the flag input back if present.
if (e != InOps.size())
Ops.push_back(InOps.back());
}