#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <errno.h>

#include "debug.h"
#include "box64context.h"
#include "box64cpu.h"
#include "emu/x64emu_private.h"
#include "x64emu.h"
#include "box64stack.h"
#include "callback.h"
#include "emu/x64run_private.h"
#include "x64trace.h"
#include "emu/x87emu_private.h"
#include "dynarec_native.h"

#include "rv64_printer.h"
#include "dynarec_rv64_private.h"
#include "../dynarec_helper.h"
#include "dynarec_rv64_functions.h"


uintptr_t dynarec64_DB(dynarec_rv64_t* dyn, uintptr_t addr, uintptr_t ip, int ninst, rex_t rex, int rep, int* ok, int* need_epilog)
{
    (void)ip;
    (void)rep;
    (void)need_epilog;

    uint8_t nextop = F8;
    uint8_t ed;
    uint8_t wback;
    uint8_t u8;
    int64_t fixedaddress;
    int unscaled;
    int v1, v2;
    int s0;
    int64_t j64;

    MAYUSE(s0);
    MAYUSE(v2);
    MAYUSE(v1);
    MAYUSE(j64);

    if (MODREG)
        switch (nextop) {
            case 0xC0 ... 0xC7:
                INST_NAME("FCMOVNB ST0, STx");
                READFLAGS(X_CF);
                v1 = x87_get_st(dyn, ninst, x1, x2, 0, X87_COMBINE(0, nextop & 7));
                v2 = x87_get_st(dyn, ninst, x1, x2, nextop & 7, X87_COMBINE(0, nextop & 7));
                ANDI(x1, xFlags, 1 << F_CF);
                CBNZ_NEXT(x1);
                if (ST_IS_F(0)) {
                    FMVS(v1, v2);
                } else {
                    FMVD(v1, v2); // F_CF==0
                }
                break;
            case 0xC8 ... 0xCF:
                INST_NAME("FCMOVNE ST0, STx");
                READFLAGS(X_ZF);
                v1 = x87_get_st(dyn, ninst, x1, x2, 0, X87_COMBINE(0, nextop & 7));
                v2 = x87_get_st(dyn, ninst, x1, x2, nextop & 7, X87_COMBINE(0, nextop & 7));
                ANDI(x1, xFlags, 1 << F_ZF);
                CBNZ_NEXT(x1);
                if (ST_IS_F(0)) {
                    FMVS(v1, v2);
                } else {
                    FMVD(v1, v2); // F_ZF==0
                }
                break;
            case 0xD0 ... 0xD7:
                INST_NAME("FCMOVNBE ST0, STx");
                READFLAGS(X_CF | X_ZF);
                v1 = x87_get_st(dyn, ninst, x1, x2, 0, X87_COMBINE(0, nextop & 7));
                v2 = x87_get_st(dyn, ninst, x1, x2, nextop & 7, X87_COMBINE(0, nextop & 7));
                ANDI(x1, xFlags, (1 << F_CF) | (1 << F_ZF));
                CBNZ_NEXT(x1);
                if (ST_IS_F(0)) {
                    FMVS(v1, v2);
                } else {
                    FMVD(v1, v2); // F_CF==0 & F_ZF==0
                }
                break;
            case 0xD8 ... 0xDF:
                INST_NAME("FCMOVNU ST0, STx");
                READFLAGS(X_PF);
                v1 = x87_get_st(dyn, ninst, x1, x2, 0, X87_COMBINE(0, nextop & 7));
                v2 = x87_get_st(dyn, ninst, x1, x2, nextop & 7, X87_COMBINE(0, nextop & 7));
                ANDI(x1, xFlags, 1 << F_PF);
                CBNZ_NEXT(x1);
                if (ST_IS_F(0)) {
                    FMVS(v1, v2);
                } else {
                    FMVD(v1, v2); // F_PF==0
                }
                break;
            case 0xE1:
                INST_NAME("FDISI8087_NOP"); // so.. NOP?
                break;
            case 0xE2:
                INST_NAME("FNCLEX");
                LH(x2, xEmu, offsetof(x64emu_t, sw));
                ANDI(x2, x2, ~(0xff));  // IE .. PE, SF, ES
                MOV32w(x1, ~(1 << 15)); // B
                AND(x2, x2, x1);
                SH(x2, xEmu, offsetof(x64emu_t, sw));
                break;
            case 0xE3:
                INST_NAME("FNINIT");
                MESSAGE(LOG_DUMP, "Need Optimization\n");
                x87_purgecache(dyn, ninst, 0, x1, x2, x3);
                CALL(const_reset_fpu, -1, 0, 0);
                NATIVE_RESTORE_X87PC();
                break;
            case 0xE8 ... 0xEF:
                INST_NAME("FUCOMI ST0, STx");
                SETFLAGS(X_ALL, SF_SET, NAT_FLAGS_NOFUSION);
                v1 = x87_get_st(dyn, ninst, x1, x2, 0, X87_COMBINE(0, nextop & 7));
                v2 = x87_get_st(dyn, ninst, x1, x2, nextop & 7, X87_COMBINE(0, nextop & 7));
                if (ST_IS_F(0)) {
                    FCOMIS(v1, v2, x1, x2, x3, x4, x5);
                } else {
                    FCOMID(v1, v2, x1, x2, x3, x4, x5);
                }

                break;
            case 0xF0 ... 0xF7:
                INST_NAME("FCOMI ST0, STx");
                SETFLAGS(X_ALL, SF_SET, NAT_FLAGS_NOFUSION);
                v1 = x87_get_st(dyn, ninst, x1, x2, 0, X87_COMBINE(0, nextop & 7));
                v2 = x87_get_st(dyn, ninst, x1, x2, nextop & 7, X87_COMBINE(0, nextop & 7));
                if (ST_IS_F(0)) {
                    FCOMIS(v1, v2, x1, x2, x3, x4, x5);
                } else {
                    FCOMID(v1, v2, x1, x2, x3, x4, x5);
                }
                break;
            default:
                DEFAULT;
                break;
        }
    else
        switch ((nextop >> 3) & 7) {
            case 0:
                INST_NAME("FILD ST0, Ed");
                X87_PUSH_OR_FAIL(v1, dyn, ninst, x1, EXT_CACHE_ST_D);
                addr = geted(dyn, addr, ninst, nextop, &ed, x2, x1, &fixedaddress, rex, NULL, 1, 0);
                LW(x1, ed, fixedaddress);
                FCVTDW(v1, x1, RD_RNE); // i32 -> double
                break;
            case 1:
                INST_NAME("FISTTP Ed, ST0");
                v1 = x87_get_st(dyn, ninst, x1, x2, 0, EXT_CACHE_ST_D);
                addr = geted(dyn, addr, ninst, nextop, &wback, x3, x4, &fixedaddress, rex, NULL, 1, 0);
                if (!BOX64ENV(dynarec_fastround)) {
                    FSFLAGSI(0); // reset all bits
                }
                FCVTWD(x4, v1, RD_RTZ);
                if (!BOX64ENV(dynarec_fastround)) {
                    FRFLAGS(x5); // get back FPSR to check the IOC bit
                    ANDI(x5, x5, 1 << FR_NV);
                    BEQZ_MARK(x5);
                    MOV32w(x4, 0x80000000);
                    MARK;
                }
                SW(x4, wback, fixedaddress);
                X87_POP_OR_FAIL(dyn, ninst, x3);
                break;
            case 2:
                INST_NAME("FIST Ed, ST0");
                v1 = x87_get_st(dyn, ninst, x1, x2, 0, EXT_CACHE_ST_D);
                u8 = x87_setround(dyn, ninst, x1, x5);
                addr = geted(dyn, addr, ninst, nextop, &wback, x2, x3, &fixedaddress, rex, NULL, 1, 0);
                v2 = fpu_get_scratch(dyn);
                if (!BOX64ENV(dynarec_fastround)) {
                    FSFLAGSI(0); // reset all bits
                }
                FCVTWD(x4, v1, RD_DYN);
                if (!BOX64ENV(dynarec_fastround)) {
                    FRFLAGS(x5); // get back FPSR to check the IOC bit
                    ANDI(x5, x5, 1 << FR_NV);
                    BEQ_MARK2(x5, xZR);
                    MOV32w(x4, 0x80000000);
                }
                MARK2;
                SW(x4, wback, fixedaddress);
                x87_restoreround(dyn, ninst, u8);
                break;
            case 3:
                INST_NAME("FISTP Ed, ST0");
                v1 = x87_get_st(dyn, ninst, x1, x2, 0, EXT_CACHE_ST_D);
                u8 = x87_setround(dyn, ninst, x1, x5);
                addr = geted(dyn, addr, ninst, nextop, &wback, x2, x3, &fixedaddress, rex, NULL, 1, 0);
                v2 = fpu_get_scratch(dyn);
                if (!BOX64ENV(dynarec_fastround)) {
                    FSFLAGSI(0); // reset all bits
                }
                FCVTWD(x4, v1, RD_DYN);
                if (!BOX64ENV(dynarec_fastround)) {
                    FRFLAGS(x5); // get back FPSR to check the IOC bit
                    ANDI(x5, x5, 1 << FR_NV);
                    BEQ_MARK2(x5, xZR);
                    MOV32w(x4, 0x80000000);
                }
                MARK2;
                SW(x4, wback, fixedaddress);
                x87_restoreround(dyn, ninst, u8);
                X87_POP_OR_FAIL(dyn, ninst, x3);
                break;
            case 5:
                INST_NAME("FLD tbyte");
                addr = geted(dyn, addr, ninst, nextop, &ed, x1, x2, &fixedaddress, rex, NULL, 8, 0);
                if ((PK(0) == 0xDB && ((PK(1) >> 3) & 7) == 7) || (!rex.is32bits && PK(0) >= 0x40 && PK(0) <= 0x4f && PK(1) == 0xDB && ((PK(2) >> 3) & 7) == 7)) {
                    NOTEST(x5);
                    // the FLD is immediatly followed by an FSTP
                    LD(x5, ed, fixedaddress + 0);
                    LH(x6, ed, fixedaddress + 8);
                    // no persistant scratch register, so unrool both instruction here...
                    MESSAGE(LOG_DUMP, "\tHack: FSTP tbyte\n");
                    nextop = F8; // 0xDB or rex
                    if (!rex.is32bits && nextop >= 0x40 && nextop <= 0x4f) {
                        rex.rex = nextop;
                        nextop = F8; // 0xDB
                    } else
                        rex.rex = 0;
                    nextop = F8; // modrm
                    addr = geted(dyn, addr, ninst, nextop, &ed, x1, x2, &fixedaddress, rex, NULL, 8, 0);
                    SD(x5, ed, fixedaddress + 0);
                    SH(x6, ed, fixedaddress + 8);
                } else {
                    if (BOX64ENV(x87_no80bits)) {
                        X87_PUSH_OR_FAIL(v1, dyn, ninst, x1, EXT_CACHE_ST_D);
                        FLD(v1, ed, fixedaddress);
                    } else {
                        ADDI(x1, ed, fixedaddress);
                        X87_PUSH_EMPTY_OR_FAIL(dyn, ninst, x3);
                        x87_reflectcount(dyn, ninst, x3, x4);
                        CALL(const_native_fld, -1, x1, 0);
                        x87_unreflectcount(dyn, ninst, x3, x4);
                    }
                }
                break;
            case 7:
                INST_NAME("FSTP tbyte");
                if (BOX64ENV(x87_no80bits)) {
                    v1 = x87_get_st(dyn, ninst, x1, x2, 0, EXT_CACHE_ST_D);
                    addr = geted(dyn, addr, ninst, nextop, &wback, x2, x1, &fixedaddress, rex, NULL, 1, 0);
                    FSD(v1, wback, fixedaddress);
                } else {
                    x87_forget(dyn, ninst, x1, x3, 0);
                    addr = geted(dyn, addr, ninst, nextop, &ed, x1, x2, &fixedaddress, rex, NULL, 0, 0);
                    x87_reflectcount(dyn, ninst, x3, x4);
                    CALL(const_native_fstp, -1, ed, 0);
                    x87_unreflectcount(dyn, ninst, x3, x4);
                }
                X87_POP_OR_FAIL(dyn, ninst, x3);
                break;
            default:
                DEFAULT;
        }
    return addr;
}