Example #1
0
//Before removing bb or change bb successor,
//you need remove the related PHI operand if BB successor has PHI stmt.
void IRBB::removeSuccessorDesignatePhiOpnd(CFG<IRBB, IR> * cfg, IRBB * succ)
{
    ASSERT0(cfg && succ);
    IR_CFG * ircfg = (IR_CFG*)cfg;
    Region * ru = ircfg->get_ru();
    UINT const pos = ircfg->WhichPred(this, succ);
    for (IR * ir = BB_first_ir(succ); ir != NULL; ir = BB_next_ir(succ)) {
        if (!ir->is_phi()) { break; }

        ASSERT0(cnt_list(PHI_opnd_list(ir)) == succ->getNumOfPred(cfg));

        IR * opnd;
        UINT lpos = pos;
        for (opnd = PHI_opnd_list(ir); lpos != 0; opnd = opnd->get_next()) {
            ASSERT0(opnd);
            lpos--;
        }

        if (opnd == NULL) {
            //PHI does not contain any operand.
            continue;
        }

        opnd->removeSSAUse();
        ((CPhi*)ir)->removeOpnd(opnd);
        ru->freeIRTree(opnd);
    }
}
Example #2
0
//Before removing bb, revising phi opnd if there are phis
//in one of bb's successors.
void IRBB::removeSuccessorPhiOpnd(CFG<IRBB, IR> * cfg)
{
    IR_CFG * ircfg = (IR_CFG*)cfg;
    Region * ru = ircfg->get_ru();
    Vertex * vex = ircfg->get_vertex(BB_id(this));
    ASSERT0(vex);
    for (EdgeC * out = VERTEX_out_list(vex);
         out != NULL; out = EC_next(out)) {
        Vertex * succ_vex = EDGE_to(EC_edge(out));
        IRBB * succ = ircfg->get_bb(VERTEX_id(succ_vex));
        ASSERT0(succ);

        UINT const pos = ircfg->WhichPred(this, succ);

        for (IR * ir = BB_first_ir(succ);
             ir != NULL; ir = BB_next_ir(succ)) {
            if (!ir->is_phi()) { break; }

            ASSERT0(cnt_list(PHI_opnd_list(ir)) ==
                     cnt_list(VERTEX_in_list(succ_vex)));

            IR * opnd;
            UINT lpos = pos;
            for (opnd = PHI_opnd_list(ir);
                 lpos != 0; opnd = IR_next(opnd)) {
                ASSERT0(opnd);
                lpos--;
            }

            opnd->removeSSAUse();
            ((CPhi*)ir)->removeOpnd(opnd);
            ru->freeIRTree(opnd);
        }
    }
}