//------------------------------------------------------------------------
// LowerRotate: Lower GT_ROL and GT_ROR nodes.
//
// Arguments:
// tree - the node to lower
//
// Return Value:
// None.
//
void Lowering::LowerRotate(GenTreePtr tree)
{
if (tree->OperGet() == GT_ROL)
{
// There is no ROL instruction on ARM. Convert ROL into ROR.
GenTreePtr rotatedValue = tree->gtOp.gtOp1;
unsigned rotatedValueBitSize = genTypeSize(rotatedValue->gtType) * 8;
GenTreePtr rotateLeftIndexNode = tree->gtOp.gtOp2;
if (rotateLeftIndexNode->IsCnsIntOrI())
{
ssize_t rotateLeftIndex = rotateLeftIndexNode->gtIntCon.gtIconVal;
ssize_t rotateRightIndex = rotatedValueBitSize - rotateLeftIndex;
rotateLeftIndexNode->gtIntCon.gtIconVal = rotateRightIndex;
}
else
{
GenTreePtr tmp =
comp->gtNewOperNode(GT_NEG, genActualType(rotateLeftIndexNode->gtType), rotateLeftIndexNode);
BlockRange().InsertAfter(rotateLeftIndexNode, tmp);
tree->gtOp.gtOp2 = tmp;
}
tree->ChangeOper(GT_ROR);
}
ContainCheckShiftRotate(tree->AsOp());
}
//------------------------------------------------------------------------
// TreeNodeInfoInitCmp: Lower a GT comparison node.
//
// Arguments:
// tree - the node to lower
//
// Return Value:
// None.
//
void Lowering::TreeNodeInfoInitCmp(GenTreePtr tree)
{
ContainCheckCompare(tree->AsOp());
TreeNodeInfo* info = &(tree->gtLsraInfo);
info->srcCount = tree->gtOp.gtOp2->isContained() ? 1 : 2;
info->dstCount = tree->OperIs(GT_CMP) ? 0 : 1;
}