diff options
| -rw-r--r-- | include/llvm/CodeGen/MachineInstr.h | 12 | ||||
| -rw-r--r-- | lib/CodeGen/MachineInstr.cpp | 16 |
2 files changed, 28 insertions, 0 deletions
diff --git a/include/llvm/CodeGen/MachineInstr.h b/include/llvm/CodeGen/MachineInstr.h index a2190d829d..106af9e5bf 100644 --- a/include/llvm/CodeGen/MachineInstr.h +++ b/include/llvm/CodeGen/MachineInstr.h @@ -295,6 +295,18 @@ public: unsigned numOperands, OpCodeMask _opCodeMask = 0x0); inline ~MachineInstr () {} + + // + // Support to rewrite a machine instruction in place: for now, simply + // replace() and then set new operands with Set.*Operand methods below. + // + void replace (MachineOpCode _opCode, + unsigned numOperands, + OpCodeMask _opCodeMask = 0x0); + + // + // The op code. Note that MachineOpCode is a target-specific type. + // const MachineOpCode getOpCode () const { return opCode; } // diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp index e12922e4c8..02c25fdd7f 100644 --- a/lib/CodeGen/MachineInstr.cpp +++ b/lib/CodeGen/MachineInstr.cpp @@ -27,6 +27,22 @@ MachineInstr::MachineInstr(MachineOpCode _opCode, { } +// +// Support for replacing opcode and operands of a MachineInstr in place. +// This only resets the size of the operand vector and initializes it. +// The new operands must be set explicitly later. +// +void +MachineInstr::replace(MachineOpCode _opCode, + unsigned numOperands, + OpCodeMask _opCodeMask) +{ + opCode = _opCode; + opCodeMask = _opCodeMask; + operands.clear(); + operands.resize(numOperands); +} + void MachineInstr::SetMachineOperandVal(unsigned int i, MachineOperand::MachineOperandType opType, |