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Add MachineInstr::tieOperands, remove setIsTied().

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Manage tied operands entirely internally to MachineInstr. This makes it
possible to change the representation of tied operands, as I will do
shortly.

The constraint that tied uses and defs must be in the same order was too
restrictive.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163021 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-08-31 20:50:53 +00:00
parent 265bcb1e5b
commit 94083149fd
4 changed files with 31 additions and 20 deletions
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include/llvm/CodeGen/MachineInstr.h
+13 -3
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@@ -782,6 +782,14 @@ public:
const TargetInstrInfo *TII,
const TargetRegisterInfo *TRI) const;
/// tieOperands - Add a tie between the register operands at DefIdx and
/// UseIdx. The tie will cause the register allocator to ensure that the two
/// operands are assigned the same physical register.
///
/// Tied operands are managed automatically for explicit operands in the
/// MCInstrDesc. This method is for exceptional cases like inline asm.
void tieOperands(unsigned DefIdx, unsigned UseIdx);
/// findTiedOperandIdx - Given the index of a tied register operand, find the
/// operand it is tied to. Defs are tied to uses and vice versa. Returns the
/// index of the tied operand which must exist.
@@ -942,9 +950,11 @@ private:
/// untieRegOperand - Break any tie involving OpIdx.
void untieRegOperand(unsigned OpIdx) {
const MachineOperand &MO = getOperand(OpIdx);
if (MO.isReg() && MO.isTied())
getOperand(findTiedOperandIdx(OpIdx)).setIsTied(false);
MachineOperand &MO = getOperand(OpIdx);
if (MO.isReg() && MO.isTied()) {
getOperand(findTiedOperandIdx(OpIdx)).IsTied = false;
MO.IsTied = false;
}
}
/// addImplicitDefUseOperands - Add all implicit def and use operands to