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// license:GPL-2.0+
// copyright-holders:Segher Boessenkool, Ryan Holtz, David Haywood
#include "emu.h"
#include "unsp.h"
#include "unspfe.h"
#include "unspdasm.h"
void unsp_device::execute_jumps(const uint16_t op)
{
const uint16_t op0 = (op >> 12) & 15;
const uint16_t op1 = (op >> 6) & 7;
const uint32_t opimm = op & 0x3f;
switch (op0)
{
case 0: // JB
if (!(m_core->m_r[REG_SR] & UNSP_C))
{
m_core->m_icount -= 4;
add_lpc((op1 == 0) ? opimm : (0 - opimm));
}
else
{
m_core->m_icount -= 2;
}
return;
case 1: // JAE
if (m_core->m_r[REG_SR] & UNSP_C)
{
m_core->m_icount -= 4;
add_lpc((op1 == 0) ? opimm : (0 - opimm));
}
else
{
m_core->m_icount -= 2;
}
return;
case 2: // JGE
if (!(m_core->m_r[REG_SR] & UNSP_S))
{
m_core->m_icount -= 4;
add_lpc((op1 == 0) ? opimm : (0 - opimm));
}
else
{
m_core->m_icount -= 2;
}
return;
case 3: // JL
if (m_core->m_r[REG_SR] & UNSP_S)
{
m_core->m_icount -= 4;
add_lpc((op1 == 0) ? opimm : (0 - opimm));
}
else
{
m_core->m_icount -= 2;
}
return;
case 4: // JNE
if (!(m_core->m_r[REG_SR] & UNSP_Z))
{
m_core->m_icount -= 4;
add_lpc((op1 == 0) ? opimm : (0 - opimm));
}
else
{
m_core->m_icount -= 2;
}
return;
case 5: // JE
if (m_core->m_r[REG_SR] & UNSP_Z)
{
m_core->m_icount -= 4;
add_lpc((op1 == 0) ? opimm : (0 - opimm));
}
else
{
m_core->m_icount -= 2;
}
return;
case 6: // JPL
if (!(m_core->m_r[REG_SR] & UNSP_N))
{
m_core->m_icount -= 4;
add_lpc((op1 == 0) ? opimm : (0 - opimm));
}
else
{
m_core->m_icount -= 2;
}
return;
case 7: // JMI
if (m_core->m_r[REG_SR] & UNSP_N)
{
m_core->m_icount -= 4;
add_lpc((op1 == 0) ? opimm : (0 - opimm));
}
else
{
m_core->m_icount -= 2;
}
return;
case 8: // JBE
if ((m_core->m_r[REG_SR] & (UNSP_Z | UNSP_C)) != UNSP_C) // branch if (!UNSP_Z && !UNSP_C) || UNSP_Z
{
m_core->m_icount -= 4;
add_lpc((op1 == 0) ? opimm : (0 - opimm));
}
else
{
m_core->m_icount -= 2;
}
return;
case 9: // JA
if ((m_core->m_r[REG_SR] & (UNSP_Z | UNSP_C)) == UNSP_C) // branch if !UNSP_Z && UNSP_C
{
m_core->m_icount -= 4;
add_lpc((op1 == 0) ? opimm : (0 - opimm));
}
else
{
m_core->m_icount -= 2;
}
return;
case 10: // JLE
if (m_core->m_r[REG_SR] & (UNSP_Z | UNSP_S))
{
m_core->m_icount -= 4;
add_lpc((op1 == 0) ? opimm : (0 - opimm));
}
else
{
m_core->m_icount -= 2;
}
return;
case 11: // JG
if (!(m_core->m_r[REG_SR] & (UNSP_Z | UNSP_S)))
{
m_core->m_icount -= 4;
add_lpc((op1 == 0) ? opimm : (0 - opimm));
}
else
{
m_core->m_icount -= 2;
}
return;
case 12: // JVC (overflow clear, N == S)
if (((m_core->m_r[REG_SR] & UNSP_N) >> UNSP_N_SHIFT) == ((m_core->m_r[REG_SR] & UNSP_S) >> UNSP_S_SHIFT))
{
m_core->m_icount -= 4;
add_lpc((op1 == 0) ? opimm : (0 - opimm));
}
else
{
m_core->m_icount -= 2;
}
return;
case 13: // JVS (overflow set, N != S) (Wrlshunt uses this)
if (((m_core->m_r[REG_SR] & UNSP_N) >> UNSP_N_SHIFT) != ((m_core->m_r[REG_SR] & UNSP_S) >> UNSP_S_SHIFT))
{
m_core->m_icount -= 4;
add_lpc((op1 == 0) ? opimm : (0 - opimm));
}
else
{
m_core->m_icount -= 2;
}
return;
case 14: // JMP
add_lpc((op1 == 0) ? opimm : (0 - opimm));
m_core->m_icount -= 4;
return;
default:
unimplemented_opcode(op);
return;
}
}
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