void
MoveEmitterMIPS::emit(const MoveOp &move)
{
const MoveOperand &from = move.from();
const MoveOperand &to = move.to();
if (move.isCycleEnd()) {
MOZ_ASSERT(inCycle_);
completeCycle(from, to, move.type());
inCycle_ = false;
return;
}
if (move.isCycleBegin()) {
MOZ_ASSERT(!inCycle_);
breakCycle(from, to, move.endCycleType());
inCycle_ = true;
}
switch (move.type()) {
case MoveOp::FLOAT32:
emitFloat32Move(from, to);
break;
case MoveOp::DOUBLE:
emitDoubleMove(from, to);
break;
case MoveOp::INT32:
MOZ_ASSERT(sizeof(uintptr_t) == sizeof(int32_t));
case MoveOp::GENERAL:
emitMove(from, to);
break;
default:
MOZ_ASSUME_UNREACHABLE("Unexpected move type");
}
}
void MoveEmitterARM64::emitMove(const MoveOp& move) {
const MoveOperand& from = move.from();
const MoveOperand& to = move.to();
if (move.isCycleBegin()) {
MOZ_ASSERT(!inCycle_ && !move.isCycleEnd());
breakCycle(from, to, move.endCycleType());
inCycle_ = true;
} else if (move.isCycleEnd()) {
MOZ_ASSERT(inCycle_);
completeCycle(from, to, move.type());
inCycle_ = false;
return;
}
switch (move.type()) {
case MoveOp::FLOAT32:
emitFloat32Move(from, to);
break;
case MoveOp::DOUBLE:
emitDoubleMove(from, to);
break;
case MoveOp::INT32:
emitInt32Move(from, to);
break;
case MoveOp::GENERAL:
emitGeneralMove(from, to);
break;
default:
MOZ_CRASH("Unexpected move type");
}
}
bool
MoveResolver::addOrderedMove(const MoveOp& move)
{
// Sometimes the register allocator generates move groups where multiple
// moves have the same source. Try to optimize these cases when the source
// is in memory and the target of one of the moves is in a register.
MOZ_ASSERT(!move.from().aliases(move.to()));
if (!move.from().isMemory() || move.isCycleBegin() || move.isCycleEnd())
return orderedMoves_.append(move);
// Look for an earlier move with the same source, where no intervening move
// touches either the source or destination of the new move.
for (int i = orderedMoves_.length() - 1; i >= 0; i--) {
const MoveOp& existing = orderedMoves_[i];
if (existing.from() == move.from() &&
!existing.to().aliases(move.to()) &&
existing.type() == move.type() &&
!existing.isCycleBegin() &&
!existing.isCycleEnd())
{
MoveOp* after = orderedMoves_.begin() + i + 1;
if (existing.to().isGeneralReg() || existing.to().isFloatReg()) {
MoveOp nmove(existing.to(), move.to(), move.type());
return orderedMoves_.insert(after, nmove);
} else if (move.to().isGeneralReg() || move.to().isFloatReg()) {
MoveOp nmove(move.to(), existing.to(), move.type());
orderedMoves_[i] = move;
return orderedMoves_.insert(after, nmove);
}
}
if (existing.aliases(move))
break;
}
return orderedMoves_.append(move);
}
void
MoveEmitterMIPS::emit(const MoveOp& move)
{
const MoveOperand& from = move.from();
const MoveOperand& to = move.to();
if (move.isCycleEnd() && move.isCycleBegin()) {
// A fun consequence of aliased registers is you can have multiple
// cycles at once, and one can end exactly where another begins.
breakCycle(from, to, move.endCycleType(), move.cycleBeginSlot());
completeCycle(from, to, move.type(), move.cycleEndSlot());
return;
}
if (move.isCycleEnd()) {
MOZ_ASSERT(inCycle_);
completeCycle(from, to, move.type(), move.cycleEndSlot());
MOZ_ASSERT(inCycle_ > 0);
inCycle_--;
return;
}
if (move.isCycleBegin()) {
breakCycle(from, to, move.endCycleType(), move.cycleBeginSlot());
inCycle_++;
}
switch (move.type()) {
case MoveOp::FLOAT32:
emitFloat32Move(from, to);
break;
case MoveOp::DOUBLE:
emitDoubleMove(from, to);
break;
case MoveOp::INT32:
MOZ_ASSERT(sizeof(uintptr_t) == sizeof(int32_t));
case MoveOp::GENERAL:
emitMove(from, to);
break;
default:
MOZ_CRASH("Unexpected move type");
}
}