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flags.c
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#include <flags.h>
// Flag set-unset-check macros
void flag_set(m_dmg_t *m_dmg, m_cpu_flags m_flag)
{
switch (m_flag)
{
case ZERO:
m_dmg->m_cpu->m_registers->m_flags.zero = 1;
break;
case NGTV:
m_dmg->m_cpu->m_registers->m_flags.ngtv = 1;
break;
case HALF:
m_dmg->m_cpu->m_registers->m_flags.half = 1;
break;
case CRRY:
m_dmg->m_cpu->m_registers->m_flags.crry = 1;
break;
default:
__builtin_unreachable();
}
}
void flag_unset(m_dmg_t *m_dmg, m_cpu_flags m_flag)
{
switch (m_flag)
{
case ZERO:
m_dmg->m_cpu->m_registers->m_flags.zero = 0;
break;
case NGTV:
m_dmg->m_cpu->m_registers->m_flags.ngtv = 0;
break;
case HALF:
m_dmg->m_cpu->m_registers->m_flags.half = 0;
break;
case CRRY:
m_dmg->m_cpu->m_registers->m_flags.crry = 0;
break;
default:
__builtin_unreachable();
}
}
bool flag_check(m_dmg_t *m_dmg, m_cpu_flags m_flag)
{
bool m_flag_status = false;
switch (m_flag)
{
case ZERO:
m_flag_status = m_dmg->m_cpu->m_registers->m_flags.zero;
break;
case NGTV:
m_flag_status = m_dmg->m_cpu->m_registers->m_flags.ngtv;
break;
case HALF:
m_flag_status = m_dmg->m_cpu->m_registers->m_flags.half;
break;
case CRRY:
m_flag_status = m_dmg->m_cpu->m_registers->m_flags.crry;
break;
default:
__builtin_unreachable();
}
return m_flag_status;
}
uint8_t m_flags_get(m_dmg_t *m_dmg)
{
uint8_t m_flags = 0;
#if defined(PREC23) || !defined(USE_GCC)
if (FLAG_CHECK(ZERO))
#else
if (m_is_bit_set(FLAGS, ZERO))
#endif
{
m_flags |= 1 << 7;
}
#if defined(PREC23) || !defined(USE_GCC)
if (FLAG_CHECK(NGTV))
#else
if (m_is_bit_set(FLAGS, NGTV))
#endif
{
m_flags |= 1 << 6;
}
#if defined(PREC23) || !defined(USE_GCC)
if (FLAG_CHECK(HALF))
#else
if (m_is_bit_set(FLAGS, HALF))
#endif
{
m_flags |= 1 << 5;
}
#if defined(PREC23) || !defined(USE_GCC)
if (FLAG_CHECK(CRRY))
#else
if (m_is_bit_set(FLAGS, CRRY))
#endif
{
m_flags |= 1 << 4;
}
return m_flags;
}
uint16_t m_flags_combine_af(m_dmg_t *m_dmg)
{
return ((A_REG << 8) | m_flags_get(m_dmg));
}
void m_flags_reg_set(m_dmg_t *m_dmg, uint8_t m_flags)
{
m_dmg->m_cpu->m_registers->m_flags.zero = ((m_flags >> ZERO) & 1);
m_dmg->m_cpu->m_registers->m_flags.ngtv = ((m_flags >> NGTV) & 1);
m_dmg->m_cpu->m_registers->m_flags.half = ((m_flags >> HALF) & 1);
m_dmg->m_cpu->m_registers->m_flags.crry = ((m_flags >> CRRY) & 1);
}
void m_af_reg_set(m_dmg_t *m_dmg, uint16_t m_af)
{
m_flags_reg_set(m_dmg, ((uint8_t) m_af));
A_REG = ((uint8_t) ((m_af & 0xFF00) >> 8));
}