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Add @earlyclobber TableGen constraint

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91554 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2009-12-16 19:43:02 +00:00
parent 0a0124e4f6
commit 06801722a4
3 changed files with 48 additions and 9 deletions
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5
include/llvm/Target/TargetInstrDesc.h
View File

@ -25,9 +25,10 @@ class TargetRegisterInfo;
//===----------------------------------------------------------------------===//
namespace TOI {
// Operand constraints: only "tied_to" for now.
// Operand constraints
enum OperandConstraint {
TIED_TO = 0 // Must be allocated the same register as.
TIED_TO = 0, // Must be allocated the same register as.
EARLY_CLOBBER // Operand is an early clobber register operand
};
/// OperandFlags - These are flags set on operands, but should be considered

24
lib/CodeGen/MachineInstr.cpp
View File

@ -555,8 +555,13 @@ void MachineInstr::addOperand(const MachineOperand &Op) {
Operands.back().ParentMI = this;
// If the operand is a register, update the operand's use list.
if (Op.isReg())
if (Op.isReg()) {
Operands.back().AddRegOperandToRegInfo(RegInfo);
// If the register operand is flagged as early, mark the operand as such
unsigned OpNo = Operands.size() - 1;
if (TID->getOperandConstraint(OpNo, TOI::EARLY_CLOBBER) != -1)
Operands[OpNo].setIsEarlyClobber(true);
}
return;
}
}
@ -573,8 +578,12 @@ void MachineInstr::addOperand(const MachineOperand &Op) {
// Do explicitly set the reginfo for this operand though, to ensure the
// next/prev fields are properly nulled out.
if (Operands[OpNo].isReg())
if (Operands[OpNo].isReg()) {
Operands[OpNo].AddRegOperandToRegInfo(0);
// If the register operand is flagged as early, mark the operand as such
if (TID->getOperandConstraint(OpNo, TOI::EARLY_CLOBBER) != -1)
Operands[OpNo].setIsEarlyClobber(true);
}
} else if (Operands.size()+1 <= Operands.capacity()) {
// Otherwise, we have to remove register operands from their register use
@ -594,8 +603,12 @@ void MachineInstr::addOperand(const MachineOperand &Op) {
Operands.insert(Operands.begin()+OpNo, Op);
Operands[OpNo].ParentMI = this;
if (Operands[OpNo].isReg())
if (Operands[OpNo].isReg()) {
Operands[OpNo].AddRegOperandToRegInfo(RegInfo);
// If the register operand is flagged as early, mark the operand as such
if (TID->getOperandConstraint(OpNo, TOI::EARLY_CLOBBER) != -1)
Operands[OpNo].setIsEarlyClobber(true);
}
// Re-add all the implicit ops.
for (unsigned i = OpNo+1, e = Operands.size(); i != e; ++i) {
@ -613,6 +626,11 @@ void MachineInstr::addOperand(const MachineOperand &Op) {
// Re-add all the operands.
AddRegOperandsToUseLists(*RegInfo);
// If the register operand is flagged as early, mark the operand as such
if (Operands[OpNo].isReg()
&& TID->getOperandConstraint(OpNo, TOI::EARLY_CLOBBER) != -1)
Operands[OpNo].setIsEarlyClobber(true);
}
}

28
utils/TableGen/CodeGenInstruction.cpp
View File

@ -18,14 +18,35 @@
using namespace llvm;
static void ParseConstraint(const std::string &CStr, CodeGenInstruction *I) {
// FIXME: Only supports TIED_TO for now.
// EARLY_CLOBBER: @early $reg
std::string::size_type wpos = CStr.find_first_of(" \t");
std::string::size_type start = CStr.find_first_not_of(" \t");
std::string Tok = CStr.substr(start, wpos - start);
if (Tok == "@earlyclobber") {
std::string Name = CStr.substr(wpos+1);
wpos = Name.find_first_not_of(" \t");
if (wpos == std::string::npos)
throw "Illegal format for @earlyclobber constraint: '" + CStr + "'";
Name = Name.substr(wpos);
std::pair<unsigned,unsigned> Op =
I->ParseOperandName(Name, false);
// Build the string for the operand
std::string OpConstraint = "(1 << TOI::EARLY_CLOBBER)";
if (!I->OperandList[Op.first].Constraints[Op.second].empty())
throw "Operand '" + Name + "' cannot have multiple constraints!";
I->OperandList[Op.first].Constraints[Op.second] = OpConstraint;
return;
}
// Only other constraint is "TIED_TO" for now.
std::string::size_type pos = CStr.find_first_of('=');
assert(pos != std::string::npos && "Unrecognized constraint");
std::string::size_type start = CStr.find_first_not_of(" \t");
start = CStr.find_first_not_of(" \t");
std::string Name = CStr.substr(start, pos - start);
// TIED_TO: $src1 = $dst
std::string::size_type wpos = Name.find_first_of(" \t");
wpos = Name.find_first_of(" \t");
if (wpos == std::string::npos)
throw "Illegal format for tied-to constraint: '" + CStr + "'";
std::string DestOpName = Name.substr(0, wpos);
@ -47,7 +68,6 @@ static void ParseConstraint(const std::string &CStr, CodeGenInstruction *I) {
std::string OpConstraint =
"((" + utostr(FlatOpNo) + " << 16) | (1 << TOI::TIED_TO))";
if (!I->OperandList[DestOp.first].Constraints[DestOp.second].empty())
throw "Operand '" + DestOpName + "' cannot have multiple constraints!";
I->OperandList[DestOp.first].Constraints[DestOp.second] = OpConstraint;