86Box/src/codegen/codegen_ops_xchg.h

#define OP_XCHG_AX_(reg)                                                                                    \
    static uint32_t                                                                                         \
    ropXCHG_AX_##reg(uint8_t opcode, uint32_t fetchdat, uint32_t op_32, uint32_t op_pc, codeblock_t *block) \
    {                                                                                                       \
        int ax_reg, host_reg, temp_reg;                                                                     \
                                                                                                            \
        ax_reg   = LOAD_REG_W(REG_AX);                                                                      \
        host_reg = LOAD_REG_W(REG_##reg);                                                                   \
        temp_reg = COPY_REG(host_reg);                                                                      \
        STORE_REG_TARGET_W_RELEASE(ax_reg, REG_##reg);                                                      \
        STORE_REG_TARGET_W_RELEASE(temp_reg, REG_AX);                                                       \
                                                                                                            \
        return op_pc;                                                                                       \
    }

OP_XCHG_AX_(BX)
OP_XCHG_AX_(CX)
OP_XCHG_AX_(DX)
OP_XCHG_AX_(SI)
OP_XCHG_AX_(DI)
OP_XCHG_AX_(SP)
OP_XCHG_AX_(BP)

#define OP_XCHG_EAX_(reg)                                                                                    \
    static uint32_t                                                                                          \
    ropXCHG_EAX_##reg(uint8_t opcode, uint32_t fetchdat, uint32_t op_32, uint32_t op_pc, codeblock_t *block) \
    {                                                                                                        \
        int eax_reg, host_reg, temp_reg;                                                                     \
                                                                                                             \
        eax_reg  = LOAD_REG_L(REG_EAX);                                                                      \
        host_reg = LOAD_REG_L(REG_##reg);                                                                    \
        temp_reg = COPY_REG(host_reg);                                                                       \
        STORE_REG_TARGET_L_RELEASE(eax_reg, REG_##reg);                                                      \
        STORE_REG_TARGET_L_RELEASE(temp_reg, REG_EAX);                                                       \
                                                                                                             \
        return op_pc;                                                                                        \
    }

OP_XCHG_EAX_(EBX)
OP_XCHG_EAX_(ECX)
OP_XCHG_EAX_(EDX)
OP_XCHG_EAX_(ESI)
OP_XCHG_EAX_(EDI)
OP_XCHG_EAX_(ESP)
OP_XCHG_EAX_(EBP)

static uint32_t
ropXCHG_b(uint8_t opcode, uint32_t fetchdat, uint32_t op_32, uint32_t op_pc, codeblock_t *block)
{
    int src_reg;
    int dst_reg;
    int temp_reg;

    if ((fetchdat & 0xc0) != 0xc0)
        return 0;

    dst_reg  = LOAD_REG_B(fetchdat & 7);
    src_reg  = LOAD_REG_B((fetchdat >> 3) & 7);
    temp_reg = COPY_REG(src_reg);
    STORE_REG_TARGET_B_RELEASE(dst_reg, (fetchdat >> 3) & 7);
    STORE_REG_TARGET_B_RELEASE(temp_reg, fetchdat & 7);

    return op_pc + 1;
}
static uint32_t
ropXCHG_w(uint8_t opcode, uint32_t fetchdat, uint32_t op_32, uint32_t op_pc, codeblock_t *block)
{
    int src_reg;
    int dst_reg;
    int temp_reg;

    if ((fetchdat & 0xc0) != 0xc0)
        return 0;

    dst_reg  = LOAD_REG_W(fetchdat & 7);
    src_reg  = LOAD_REG_W((fetchdat >> 3) & 7);
    temp_reg = COPY_REG(src_reg);
    STORE_REG_TARGET_W_RELEASE(dst_reg, (fetchdat >> 3) & 7);
    STORE_REG_TARGET_W_RELEASE(temp_reg, fetchdat & 7);

    return op_pc + 1;
}
static uint32_t
ropXCHG_l(uint8_t opcode, uint32_t fetchdat, uint32_t op_32, uint32_t op_pc, codeblock_t *block)
{
    int src_reg;
    int dst_reg;
    int temp_reg;

    if ((fetchdat & 0xc0) != 0xc0)
        return 0;

    dst_reg  = LOAD_REG_L(fetchdat & 7);
    src_reg  = LOAD_REG_L((fetchdat >> 3) & 7);
    temp_reg = COPY_REG(src_reg);
    STORE_REG_TARGET_L_RELEASE(dst_reg, (fetchdat >> 3) & 7);
    STORE_REG_TARGET_L_RELEASE(temp_reg, fetchdat & 7);

    return op_pc + 1;
}