Remove the isTwoAddress property from the CodeGenInstruction class. It should
not be used for anything other than backwards compat constraint handling.
Add support for a new DisableEncoding property which contains a list of
registers that should not be encoded by the generated code emitter. Convert
the codeemitter generator to use this, fixing some PPC JIT regressions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31769 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/CodeGenTarget.cpp b/utils/TableGen/CodeGenTarget.cpp
index 2281519..4613c1b 100644
--- a/utils/TableGen/CodeGenTarget.cpp
+++ b/utils/TableGen/CodeGenTarget.cpp
@@ -343,7 +343,7 @@
isCall = R->getValueAsBit("isCall");
isLoad = R->getValueAsBit("isLoad");
isStore = R->getValueAsBit("isStore");
- isTwoAddress = R->getValueAsBit("isTwoAddress");
+ bool isTwoAddress = R->getValueAsBit("isTwoAddress");
isPredicated = false; // set below.
isConvertibleToThreeAddress = R->getValueAsBit("isConvertibleToThreeAddress");
isCommutable = R->getValueAsBit("isCommutable");
@@ -413,6 +413,7 @@
MIOperandNo += NumOps;
}
+ // Parse Constraints.
ParseConstraints(R->getValueAsString("Constraints"), this);
// For backward compatibility: isTwoAddress means operand 1 is tied to
@@ -430,6 +431,21 @@
for (unsigned j = 0, e = OperandList[op].MINumOperands; j != e; ++j)
if (OperandList[op].Constraints[j].empty())
OperandList[op].Constraints[j] = "0";
+
+ // Parse the DisableEncoding field.
+ std::string DisableEncoding = R->getValueAsString("DisableEncoding");
+ while (1) {
+ std::string OpName = getToken(DisableEncoding, " ,\t");
+ if (OpName.empty()) break;
+
+ // Figure out which operand this is.
+ std::pair<unsigned,unsigned> Op = ParseOperandName(OpName, false);
+
+ // Mark the operand as not-to-be encoded.
+ if (Op.second >= OperandList[Op.first].DoNotEncode.size())
+ OperandList[Op.first].DoNotEncode.resize(Op.second+1);
+ OperandList[Op.first].DoNotEncode[Op.second] = true;
+ }
}