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Add new CC lowering rule: provide a list of registers, which can be 'shadowed',

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when some another register is used for argument passing.
Currently is used on Win64.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49079 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2008-04-02 05:23:57 +00:00
parent 52b1733df4
commit 67073f1cbd
4 changed files with 88 additions and 9 deletions
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utils/TableGen/CallingConvEmitter.cpp
+42
View File
@@ -111,6 +111,48 @@ void CallingConvEmitter::EmitAction(Record *Action,
<< "Reg, LocVT, LocInfo));\n";
O << IndentStr << " return false;\n";
O << IndentStr << "}\n";
} else if (Action->isSubClassOf("CCAssignToRegWithShadow")) {
ListInit *RegList = Action->getValueAsListInit("RegList");
ListInit *ShadowRegList = Action->getValueAsListInit("ShadowRegList");
if (ShadowRegList->getSize() >0 &&
ShadowRegList->getSize() != RegList->getSize())
throw "Invalid length of list of shadowed registers";
if (RegList->getSize() == 1) {
O << IndentStr << "if (unsigned Reg = State.AllocateReg(";
O << getQualifiedName(RegList->getElementAsRecord(0));
O << ", " << getQualifiedName(ShadowRegList->getElementAsRecord(0));
O << ")) {\n";
} else {
unsigned RegListNumber = ++Counter;
unsigned ShadowRegListNumber = ++Counter;
O << IndentStr << "static const unsigned RegList" << RegListNumber
<< "[] = {\n";
O << IndentStr << " ";
for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) {
if (i != 0) O << ", ";
O << getQualifiedName(RegList->getElementAsRecord(i));
}
O << "\n" << IndentStr << "};\n";
O << IndentStr << "static const unsigned RegList"
<< ShadowRegListNumber << "[] = {\n";
O << IndentStr << " ";
for (unsigned i = 0, e = ShadowRegList->getSize(); i != e; ++i) {
if (i != 0) O << ", ";
O << getQualifiedName(ShadowRegList->getElementAsRecord(i));
}
O << "\n" << IndentStr << "};\n";
O << IndentStr << "if (unsigned Reg = State.AllocateReg(RegList"
<< RegListNumber << ", " << "RegList" << ShadowRegListNumber
<< ", " << RegList->getSize() << ")) {\n";
}
O << IndentStr << " State.addLoc(CCValAssign::getReg(ValNo, ValVT, "
<< "Reg, LocVT, LocInfo));\n";
O << IndentStr << " return false;\n";
O << IndentStr << "}\n";
} else if (Action->isSubClassOf("CCAssignToStack")) {
int Size = Action->getValueAsInt("Size");
int Align = Action->getValueAsInt("Align");