Ejemplo n.º 1
0
//------------------------------------------------------------------------
// 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());
}
Ejemplo n.º 2
0
//------------------------------------------------------------------------
// 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;
}