Add new CC lowering rule: provide a list of registers, which can be 'shadowed',
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
diff --git a/utils/TableGen/CallingConvEmitter.cpp b/utils/TableGen/CallingConvEmitter.cpp
index 192bba5..a211b6a 100644
--- a/utils/TableGen/CallingConvEmitter.cpp
+++ b/utils/TableGen/CallingConvEmitter.cpp
@@ -111,6 +111,48 @@
<< "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");