/*
 * RISC-V translation routines for the RV64D Standard Extension.
 *
 * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
 * Copyright (c) 2018 Peer Adelt, peer.adelt@hni.uni-paderborn.de
 *                    Bastian Koppelmann, kbastian@mail.uni-paderborn.de
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2 or later, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#define REQUIRE_ZDINX_OR_D(ctx) do { \
    if (!ctx->cfg_ptr->ext_zdinx) { \
        REQUIRE_EXT(ctx, RVD); \
    } \
} while (0)

#define REQUIRE_EVEN(ctx, reg) do { \
    if (ctx->cfg_ptr->ext_zdinx && (get_xl(ctx) == MXL_RV32) && \
        ((reg) & 0x1)) { \
        return false; \
    } \
} while (0)

#define REQUIRE_ZCD_OR_DC(ctx) do { \
    if (!ctx->cfg_ptr->ext_zcd) { \
        if (!has_ext(ctx, RVD) || !has_ext(ctx, RVC)) { \
            return false; \
        } \
    } \
} while (0)

static bool trans_fld(DisasContext *ctx, arg_fld *a)
{
    TCGv addr;
    MemOp memop = MO_TEUQ;

    REQUIRE_FPU;
    REQUIRE_EXT(ctx, RVD);

    /*
     * FLD and FSD are only guaranteed to execute atomically if the effective
     * address is naturally aligned and XLEN≥64. Also, zama16b applies to
     * loads and stores of no more than MXLEN bits defined in the F, D, and
     * Q extensions.
     */
    if (get_xl_max(ctx) == MXL_RV32) {
        memop |= MO_ATOM_NONE;
    } else if (ctx->cfg_ptr->ext_zama16b) {
        memop |= MO_ATOM_WITHIN16;
    } else {
        memop |= MO_ATOM_IFALIGN;
    }

    decode_save_opc(ctx, 0);
    addr = get_address(ctx, a->rs1, a->imm);
    tcg_gen_qemu_ld_i64(cpu_fpr[a->rd], addr, ctx->mem_idx, memop);

    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fsd(DisasContext *ctx, arg_fsd *a)
{
    TCGv addr;
    MemOp memop = MO_TEUQ;

    REQUIRE_FPU;
    REQUIRE_EXT(ctx, RVD);

    if (get_xl_max(ctx) == MXL_RV32) {
        memop |= MO_ATOM_NONE;
    } else if (ctx->cfg_ptr->ext_zama16b) {
        memop |= MO_ATOM_WITHIN16;
    } else {
        memop |= MO_ATOM_IFALIGN;
    }

    decode_save_opc(ctx, 0);
    addr = get_address(ctx, a->rs1, a->imm);
    tcg_gen_qemu_st_i64(cpu_fpr[a->rs2], addr, ctx->mem_idx, memop);
    return true;
}

static bool trans_c_fld(DisasContext *ctx, arg_fld *a)
{
    REQUIRE_ZCD_OR_DC(ctx);
    return trans_fld(ctx, a);
}

static bool trans_c_fsd(DisasContext *ctx, arg_fsd *a)
{
    REQUIRE_ZCD_OR_DC(ctx);
    return trans_fsd(ctx, a);
}

static bool trans_fmadd_d(DisasContext *ctx, arg_fmadd_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd | a->rs1 | a->rs2 | a->rs3);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);
    TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);
    TCGv_i64 src3 = get_fpr_d(ctx, a->rs3);

    gen_set_rm(ctx, a->rm);
    gen_helper_fmadd_d(dest, tcg_env, src1, src2, src3);
    gen_set_fpr_d(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fmsub_d(DisasContext *ctx, arg_fmsub_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd | a->rs1 | a->rs2 | a->rs3);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);
    TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);
    TCGv_i64 src3 = get_fpr_d(ctx, a->rs3);

    gen_set_rm(ctx, a->rm);
    gen_helper_fmsub_d(dest, tcg_env, src1, src2, src3);
    gen_set_fpr_d(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fnmsub_d(DisasContext *ctx, arg_fnmsub_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd | a->rs1 | a->rs2 | a->rs3);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);
    TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);
    TCGv_i64 src3 = get_fpr_d(ctx, a->rs3);

    gen_set_rm(ctx, a->rm);
    gen_helper_fnmsub_d(dest, tcg_env, src1, src2, src3);
    gen_set_fpr_d(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fnmadd_d(DisasContext *ctx, arg_fnmadd_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd | a->rs1 | a->rs2 | a->rs3);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);
    TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);
    TCGv_i64 src3 = get_fpr_d(ctx, a->rs3);

    gen_set_rm(ctx, a->rm);
    gen_helper_fnmadd_d(dest, tcg_env, src1, src2, src3);
    gen_set_fpr_d(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fadd_d(DisasContext *ctx, arg_fadd_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd | a->rs1 | a->rs2);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);
    TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);

    gen_set_rm(ctx, a->rm);
    gen_helper_fadd_d(dest, tcg_env, src1, src2);
    gen_set_fpr_d(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fsub_d(DisasContext *ctx, arg_fsub_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd | a->rs1 | a->rs2);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);
    TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);

    gen_set_rm(ctx, a->rm);
    gen_helper_fsub_d(dest, tcg_env, src1, src2);
    gen_set_fpr_d(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fmul_d(DisasContext *ctx, arg_fmul_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd | a->rs1 | a->rs2);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);
    TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);

    gen_set_rm(ctx, a->rm);
    gen_helper_fmul_d(dest, tcg_env, src1, src2);
    gen_set_fpr_d(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fdiv_d(DisasContext *ctx, arg_fdiv_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd | a->rs1 | a->rs2);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);
    TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);

    gen_set_rm(ctx, a->rm);
    gen_helper_fdiv_d(dest, tcg_env, src1, src2);
    gen_set_fpr_d(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fsqrt_d(DisasContext *ctx, arg_fsqrt_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd | a->rs1);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);

    gen_set_rm(ctx, a->rm);
    gen_helper_fsqrt_d(dest, tcg_env, src1);
    gen_set_fpr_d(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fsgnj_d(DisasContext *ctx, arg_fsgnj_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd | a->rs1 | a->rs2);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    if (a->rs1 == a->rs2) { /* FMOV */
        dest = get_fpr_d(ctx, a->rs1);
    } else {
        TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);
        TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);
        tcg_gen_deposit_i64(dest, src2, src1, 0, 63);
    }
    gen_set_fpr_d(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fsgnjn_d(DisasContext *ctx, arg_fsgnjn_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd | a->rs1 | a->rs2);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);

    if (a->rs1 == a->rs2) { /* FNEG */
        tcg_gen_xori_i64(dest, src1, INT64_MIN);
    } else {
        TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);
        TCGv_i64 t0 = tcg_temp_new_i64();
        tcg_gen_not_i64(t0, src2);
        tcg_gen_deposit_i64(dest, t0, src1, 0, 63);
    }
    gen_set_fpr_d(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fsgnjx_d(DisasContext *ctx, arg_fsgnjx_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd | a->rs1 | a->rs2);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);

    if (a->rs1 == a->rs2) { /* FABS */
        tcg_gen_andi_i64(dest, src1, ~INT64_MIN);
    } else {
        TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);
        TCGv_i64 t0 = tcg_temp_new_i64();
        tcg_gen_andi_i64(t0, src2, INT64_MIN);
        tcg_gen_xor_i64(dest, src1, t0);
    }
    gen_set_fpr_d(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fmin_d(DisasContext *ctx, arg_fmin_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd | a->rs1 | a->rs2);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);
    TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);

    gen_helper_fmin_d(dest, tcg_env, src1, src2);
    gen_set_fpr_d(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fmax_d(DisasContext *ctx, arg_fmax_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd | a->rs1 | a->rs2);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);
    TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);

    gen_helper_fmax_d(dest, tcg_env, src1, src2);
    gen_set_fpr_d(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fcvt_s_d(DisasContext *ctx, arg_fcvt_s_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rs1);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);

    gen_set_rm(ctx, a->rm);
    gen_helper_fcvt_s_d(dest, tcg_env, src1);
    gen_set_fpr_hs(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fcvt_d_s(DisasContext *ctx, arg_fcvt_d_s *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_hs(ctx, a->rs1);

    gen_set_rm(ctx, a->rm);
    gen_helper_fcvt_d_s(dest, tcg_env, src1);
    gen_set_fpr_d(ctx, a->rd, dest);
    mark_fs_dirty(ctx);
    return true;
}

static bool trans_feq_d(DisasContext *ctx, arg_feq_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rs1 | a->rs2);

    TCGv dest = dest_gpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);
    TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);

    gen_helper_feq_d(dest, tcg_env, src1, src2);
    gen_set_gpr(ctx, a->rd, dest);
    return true;
}

static bool trans_flt_d(DisasContext *ctx, arg_flt_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rs1 | a->rs2);

    TCGv dest = dest_gpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);
    TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);

    gen_helper_flt_d(dest, tcg_env, src1, src2);
    gen_set_gpr(ctx, a->rd, dest);
    return true;
}

static bool trans_fle_d(DisasContext *ctx, arg_fle_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rs1 | a->rs2);

    TCGv dest = dest_gpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);
    TCGv_i64 src2 = get_fpr_d(ctx, a->rs2);

    gen_helper_fle_d(dest, tcg_env, src1, src2);
    gen_set_gpr(ctx, a->rd, dest);
    return true;
}

static bool trans_fclass_d(DisasContext *ctx, arg_fclass_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rs1);

    TCGv dest = dest_gpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);

    gen_helper_fclass_d(dest, src1);
    gen_set_gpr(ctx, a->rd, dest);
    return true;
}

static bool trans_fcvt_w_d(DisasContext *ctx, arg_fcvt_w_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rs1);

    TCGv dest = dest_gpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);

    gen_set_rm(ctx, a->rm);
    gen_helper_fcvt_w_d(dest, tcg_env, src1);
    gen_set_gpr(ctx, a->rd, dest);
    return true;
}

static bool trans_fcvt_wu_d(DisasContext *ctx, arg_fcvt_wu_d *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rs1);

    TCGv dest = dest_gpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);

    gen_set_rm(ctx, a->rm);
    gen_helper_fcvt_wu_d(dest, tcg_env, src1);
    gen_set_gpr(ctx, a->rd, dest);
    return true;
}

static bool trans_fcvt_d_w(DisasContext *ctx, arg_fcvt_d_w *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv src = get_gpr(ctx, a->rs1, EXT_SIGN);

    gen_set_rm(ctx, a->rm);
    gen_helper_fcvt_d_w(dest, tcg_env, src);
    gen_set_fpr_d(ctx, a->rd, dest);

    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fcvt_d_wu(DisasContext *ctx, arg_fcvt_d_wu *a)
{
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv src = get_gpr(ctx, a->rs1, EXT_ZERO);

    gen_set_rm(ctx, a->rm);
    gen_helper_fcvt_d_wu(dest, tcg_env, src);
    gen_set_fpr_d(ctx, a->rd, dest);

    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fcvt_l_d(DisasContext *ctx, arg_fcvt_l_d *a)
{
    REQUIRE_64BIT(ctx);
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rs1);

    TCGv dest = dest_gpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);

    gen_set_rm(ctx, a->rm);
    gen_helper_fcvt_l_d(dest, tcg_env, src1);
    gen_set_gpr(ctx, a->rd, dest);
    return true;
}

static bool trans_fcvt_lu_d(DisasContext *ctx, arg_fcvt_lu_d *a)
{
    REQUIRE_64BIT(ctx);
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rs1);

    TCGv dest = dest_gpr(ctx, a->rd);
    TCGv_i64 src1 = get_fpr_d(ctx, a->rs1);

    gen_set_rm(ctx, a->rm);
    gen_helper_fcvt_lu_d(dest, tcg_env, src1);
    gen_set_gpr(ctx, a->rd, dest);
    return true;
}

static bool trans_fmv_x_d(DisasContext *ctx, arg_fmv_x_d *a)
{
    REQUIRE_64BIT(ctx);
    REQUIRE_FPU;
    REQUIRE_EXT(ctx, RVD);

#ifdef TARGET_RISCV64
    gen_set_gpr(ctx, a->rd, cpu_fpr[a->rs1]);
    return true;
#else
    qemu_build_not_reached();
#endif
}

static bool trans_fcvt_d_l(DisasContext *ctx, arg_fcvt_d_l *a)
{
    REQUIRE_64BIT(ctx);
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv src = get_gpr(ctx, a->rs1, EXT_SIGN);

    gen_set_rm(ctx, a->rm);
    gen_helper_fcvt_d_l(dest, tcg_env, src);
    gen_set_fpr_d(ctx, a->rd, dest);

    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fcvt_d_lu(DisasContext *ctx, arg_fcvt_d_lu *a)
{
    REQUIRE_64BIT(ctx);
    REQUIRE_FPU;
    REQUIRE_ZDINX_OR_D(ctx);
    REQUIRE_EVEN(ctx, a->rd);

    TCGv_i64 dest = dest_fpr(ctx, a->rd);
    TCGv src = get_gpr(ctx, a->rs1, EXT_ZERO);

    gen_set_rm(ctx, a->rm);
    gen_helper_fcvt_d_lu(dest, tcg_env, src);
    gen_set_fpr_d(ctx, a->rd, dest);

    mark_fs_dirty(ctx);
    return true;
}

static bool trans_fmv_d_x(DisasContext *ctx, arg_fmv_d_x *a)
{
    REQUIRE_64BIT(ctx);
    REQUIRE_FPU;
    REQUIRE_EXT(ctx, RVD);

#ifdef TARGET_RISCV64
    tcg_gen_mov_tl(cpu_fpr[a->rd], get_gpr(ctx, a->rs1, EXT_NONE));
    mark_fs_dirty(ctx);
    return true;
#else
    qemu_build_not_reached();
#endif
}