bit usesCustomDAGSchedInserter = 0; // Pseudo instr needing special help.
bit hasCtrlDep = 0; // Does this instruction r/w ctrl-flow chains?
bit isNotDuplicable = 0; // Is it unsafe to duplicate this instruction?
+ bit isAsCheapAsAMove = 0; // As cheap (or cheaper) than a move instruction.
// Side effect flags - When set, the flags have these meanings:
//
// hasSideEffects - The instruction has side effects that are not
// captured by any operands of the instruction or other flags.
+ //
// mayHaveSideEffects - Some instances of the instruction can have side
// effects. The virtual method "isReallySideEffectFree" is called to
// determine this. Load instructions are an example of where this is
// useful. In general, loads always have side effects. However, loads from
// constant pools don't. Individual back ends make this determination.
+ //
// neverHasSideEffects - Set on an instruction with no pattern if it has no
// side effects.
bit hasSideEffects = 0;
bit mayHaveSideEffects = 0;
bit neverHasSideEffects = 0;
-
+
InstrItinClass Itinerary = NoItinerary;// Execution steps used for scheduling.
string Constraints = ""; // OperandConstraint, e.g. $src = $dst.