Commit c06b1817 authored by Richard Henderson's avatar Richard Henderson
Browse files

target-tilegx: Handle bitfield instructions 



Reviewed-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: default avatarRichard Henderson <rth@twiddle.net>
parent d5dbd6eb

target-tilegx/translate.c

+74 −0
Original line number Diff line number Diff line
@@ -1125,13 +1125,87 @@ static TileExcp gen_bf_opcode_x0(DisasContext *dc, unsigned ext, 
                                 unsigned dest, unsigned srca,

                                 unsigned bfs, unsigned bfe)

{

    TCGv tdest = dest_gr(dc, dest);

    TCGv tsrca = load_gr(dc, srca);

    TCGv tsrcd;

    int len;

    const char *mnemonic;



    /* The bitfield is either between E and S inclusive,

       or up from S and down from E inclusive.  */

    if (bfs <= bfe) {

        len = bfe - bfs + 1;

    } else {

        len = (64 - bfs) + (bfe + 1);

    }



    switch (ext) {

    case BFEXTU_BF_OPCODE_X0:

        if (bfs == 0 && bfe == 7) {

            tcg_gen_ext8u_tl(tdest, tsrca);

        } else if (bfs == 0 && bfe == 15) {

            tcg_gen_ext16u_tl(tdest, tsrca);

        } else if (bfs == 0 && bfe == 31) {

            tcg_gen_ext32u_tl(tdest, tsrca);

        } else {

            int rol = 63 - bfe;

            if (bfs <= bfe) {

                tcg_gen_shli_tl(tdest, tsrca, rol);

            } else {

                tcg_gen_rotli_tl(tdest, tsrca, rol);

            }

            tcg_gen_shri_tl(tdest, tdest, (bfs + rol) & 63);

        }

        mnemonic = "bfextu";

        break;



    case BFEXTS_BF_OPCODE_X0:

        if (bfs == 0 && bfe == 7) {

            tcg_gen_ext8s_tl(tdest, tsrca);

        } else if (bfs == 0 && bfe == 15) {

            tcg_gen_ext16s_tl(tdest, tsrca);

        } else if (bfs == 0 && bfe == 31) {

            tcg_gen_ext32s_tl(tdest, tsrca);

        } else {

            int rol = 63 - bfe;

            if (bfs <= bfe) {

                tcg_gen_shli_tl(tdest, tsrca, rol);

            } else {

                tcg_gen_rotli_tl(tdest, tsrca, rol);

            }

            tcg_gen_sari_tl(tdest, tdest, (bfs + rol) & 63);

        }

        mnemonic = "bfexts";

        break;



    case BFINS_BF_OPCODE_X0:

        tsrcd = load_gr(dc, dest);

        if (bfs <= bfe) {

            tcg_gen_deposit_tl(tdest, tsrcd, tsrca, bfs, len);

        } else {

            tcg_gen_rotri_tl(tdest, tsrcd, bfs);

            tcg_gen_deposit_tl(tdest, tdest, tsrca, 0, len);

            tcg_gen_rotli_tl(tdest, tdest, bfs);

        }

        mnemonic = "bfins";

        break;



    case MM_BF_OPCODE_X0:

        tsrcd = load_gr(dc, dest);

        if (bfs == 0) {

            tcg_gen_deposit_tl(tdest, tsrca, tsrcd, 0, len);

        } else {

            uint64_t mask = len == 64 ? -1 : rol64((1ULL << len) - 1, bfs);

            TCGv tmp = tcg_const_tl(mask);



            tcg_gen_and_tl(tdest, tsrcd, tmp);

            tcg_gen_andc_tl(tmp, tsrca, tmp);

            tcg_gen_or_tl(tdest, tdest, tmp);

            tcg_temp_free(tmp);

        }

        mnemonic = "mm";

        break;



    default:

        return TILEGX_EXCP_OPCODE_UNIMPLEMENTED;

    }