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Add @earlyclobber TableGen constraint
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91554 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -25,9 +25,10 @@ class TargetRegisterInfo;
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//===----------------------------------------------------------------------===//
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namespace TOI {
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// Operand constraints: only "tied_to" for now.
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// Operand constraints
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enum OperandConstraint {
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TIED_TO = 0 // Must be allocated the same register as.
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TIED_TO = 0, // Must be allocated the same register as.
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EARLY_CLOBBER // Operand is an early clobber register operand
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};
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/// OperandFlags - These are flags set on operands, but should be considered
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@ -555,8 +555,13 @@ void MachineInstr::addOperand(const MachineOperand &Op) {
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Operands.back().ParentMI = this;
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// If the operand is a register, update the operand's use list.
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if (Op.isReg())
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if (Op.isReg()) {
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Operands.back().AddRegOperandToRegInfo(RegInfo);
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// If the register operand is flagged as early, mark the operand as such
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unsigned OpNo = Operands.size() - 1;
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if (TID->getOperandConstraint(OpNo, TOI::EARLY_CLOBBER) != -1)
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Operands[OpNo].setIsEarlyClobber(true);
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}
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return;
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}
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}
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@ -573,8 +578,12 @@ void MachineInstr::addOperand(const MachineOperand &Op) {
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// Do explicitly set the reginfo for this operand though, to ensure the
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// next/prev fields are properly nulled out.
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if (Operands[OpNo].isReg())
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if (Operands[OpNo].isReg()) {
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Operands[OpNo].AddRegOperandToRegInfo(0);
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// If the register operand is flagged as early, mark the operand as such
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if (TID->getOperandConstraint(OpNo, TOI::EARLY_CLOBBER) != -1)
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Operands[OpNo].setIsEarlyClobber(true);
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}
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} else if (Operands.size()+1 <= Operands.capacity()) {
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// Otherwise, we have to remove register operands from their register use
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@ -594,8 +603,12 @@ void MachineInstr::addOperand(const MachineOperand &Op) {
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Operands.insert(Operands.begin()+OpNo, Op);
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Operands[OpNo].ParentMI = this;
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if (Operands[OpNo].isReg())
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if (Operands[OpNo].isReg()) {
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Operands[OpNo].AddRegOperandToRegInfo(RegInfo);
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// If the register operand is flagged as early, mark the operand as such
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if (TID->getOperandConstraint(OpNo, TOI::EARLY_CLOBBER) != -1)
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Operands[OpNo].setIsEarlyClobber(true);
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}
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// Re-add all the implicit ops.
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for (unsigned i = OpNo+1, e = Operands.size(); i != e; ++i) {
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@ -613,6 +626,11 @@ void MachineInstr::addOperand(const MachineOperand &Op) {
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// Re-add all the operands.
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AddRegOperandsToUseLists(*RegInfo);
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// If the register operand is flagged as early, mark the operand as such
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if (Operands[OpNo].isReg()
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&& TID->getOperandConstraint(OpNo, TOI::EARLY_CLOBBER) != -1)
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Operands[OpNo].setIsEarlyClobber(true);
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}
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}
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@ -18,14 +18,35 @@
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using namespace llvm;
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static void ParseConstraint(const std::string &CStr, CodeGenInstruction *I) {
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// FIXME: Only supports TIED_TO for now.
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// EARLY_CLOBBER: @early $reg
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std::string::size_type wpos = CStr.find_first_of(" \t");
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std::string::size_type start = CStr.find_first_not_of(" \t");
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std::string Tok = CStr.substr(start, wpos - start);
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if (Tok == "@earlyclobber") {
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std::string Name = CStr.substr(wpos+1);
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wpos = Name.find_first_not_of(" \t");
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if (wpos == std::string::npos)
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throw "Illegal format for @earlyclobber constraint: '" + CStr + "'";
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Name = Name.substr(wpos);
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std::pair<unsigned,unsigned> Op =
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I->ParseOperandName(Name, false);
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// Build the string for the operand
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std::string OpConstraint = "(1 << TOI::EARLY_CLOBBER)";
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if (!I->OperandList[Op.first].Constraints[Op.second].empty())
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throw "Operand '" + Name + "' cannot have multiple constraints!";
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I->OperandList[Op.first].Constraints[Op.second] = OpConstraint;
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return;
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}
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// Only other constraint is "TIED_TO" for now.
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std::string::size_type pos = CStr.find_first_of('=');
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assert(pos != std::string::npos && "Unrecognized constraint");
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std::string::size_type start = CStr.find_first_not_of(" \t");
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start = CStr.find_first_not_of(" \t");
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std::string Name = CStr.substr(start, pos - start);
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// TIED_TO: $src1 = $dst
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std::string::size_type wpos = Name.find_first_of(" \t");
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wpos = Name.find_first_of(" \t");
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if (wpos == std::string::npos)
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throw "Illegal format for tied-to constraint: '" + CStr + "'";
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std::string DestOpName = Name.substr(0, wpos);
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@ -47,7 +68,6 @@ static void ParseConstraint(const std::string &CStr, CodeGenInstruction *I) {
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std::string OpConstraint =
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"((" + utostr(FlatOpNo) + " << 16) | (1 << TOI::TIED_TO))";
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if (!I->OperandList[DestOp.first].Constraints[DestOp.second].empty())
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throw "Operand '" + DestOpName + "' cannot have multiple constraints!";
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I->OperandList[DestOp.first].Constraints[DestOp.second] = OpConstraint;
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