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simplify branch code

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This commit is contained in:
Michaël Banaan Ananas 2014-02-05 22:47:42 +00:00
parent 49121f9998
commit 239c24c223
2 changed files with 39 additions and 213 deletions
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251
src/emu/cpu/mn10200/mn10200.c
View File

@ -569,6 +569,21 @@ void mn10200_device::do_jsr(UINT32 to, UINT32 ret)
write_mem24(m_a[3], ret);
}
void mn10200_device::do_branch(int offset, bool state)
{
if (state)
{
m_cycles -= offset + 1;
mn102_change_pc(m_pc + offset + 1 + (INT8)read_arg8(m_pc + offset));
}
else
{
m_cycles -= offset;
m_pc += offset + 1;
}
}
// take an external IRQ
void mn10200_device::execute_set_input(int irqnum, int state)
{
@ -786,148 +801,57 @@ void mn10200_device::execute_run()
// blt label8
case 0xe0:
if (((m_psw & (FLAG_NF|FLAG_VF)) == FLAG_NF) || ((m_psw & (FLAG_NF|FLAG_VF)) == FLAG_VF)) // (VF^NF)=1
{
m_cycles -= 2;
mn102_change_pc(m_pc + 2 + (INT8)read_arg8(m_pc + 1));
}
else
{
m_cycles -= 1;
m_pc += 2;
}
do_branch(1, ((m_psw & (FLAG_NF|FLAG_VF)) == FLAG_NF) || ((m_psw & (FLAG_NF|FLAG_VF)) == FLAG_VF)); // (VF^NF)=1
break;
// bgt label8
case 0xe1:
if (((m_psw & (FLAG_ZF|FLAG_NF|FLAG_VF)) == 0) || ((m_psw & (FLAG_ZF|FLAG_NF|FLAG_VF)) == (FLAG_NF|FLAG_VF))) // ((VF^NF)|ZF)=0
{
m_cycles -= 2;
mn102_change_pc(m_pc + 2 + (INT8)read_arg8(m_pc + 1));
}
else
{
m_cycles -= 1;
m_pc += 2;
}
do_branch(1, ((m_psw & (FLAG_ZF|FLAG_NF|FLAG_VF)) == 0) || ((m_psw & (FLAG_ZF|FLAG_NF|FLAG_VF)) == (FLAG_NF|FLAG_VF))); // ((VF^NF)|ZF)=0
break;
// bge label8
case 0xe2:
if (((m_psw & (FLAG_NF|FLAG_VF)) == 0) || ((m_psw & (FLAG_NF|FLAG_VF)) == (FLAG_NF|FLAG_VF))) // (VF^NF)=0
{
m_cycles -= 2;
mn102_change_pc(m_pc + 2 + (INT8)read_arg8(m_pc + 1));
}
else
{
m_cycles -= 1;
m_pc += 2;
}
do_branch(1, ((m_psw & (FLAG_NF|FLAG_VF)) == 0) || ((m_psw & (FLAG_NF|FLAG_VF)) == (FLAG_NF|FLAG_VF))); // (VF^NF)=0
break;
// ble label8
case 0xe3:
if ((m_psw & FLAG_ZF) || ((m_psw & (FLAG_NF|FLAG_VF)) == FLAG_NF) || ((m_psw & (FLAG_NF|FLAG_VF)) == FLAG_VF)) // ((VF^NF)|ZF)=1
{
m_cycles -= 2;
mn102_change_pc(m_pc + 2 + (INT8)read_arg8(m_pc + 1));
}
else
{
m_cycles -= 1;
m_pc += 2;
}
do_branch(1, (m_psw & FLAG_ZF) || ((m_psw & (FLAG_NF|FLAG_VF)) == FLAG_NF) || ((m_psw & (FLAG_NF|FLAG_VF)) == FLAG_VF)); // ((VF^NF)|ZF)=1
break;
// bcs label8
case 0xe4:
if (m_psw & FLAG_CF) // CF=1
{
m_cycles -= 2;
mn102_change_pc(m_pc + 2 + (INT8)read_arg8(m_pc + 1));
}
else
{
m_cycles -= 1;
m_pc += 2;
}
do_branch(1, m_psw & FLAG_CF); // CF=1
break;
// bhi label8
case 0xe5:
if (!(m_psw & (FLAG_ZF|FLAG_CF))) // (CF|ZF)=0
{
m_cycles -= 2;
mn102_change_pc(m_pc + 2 + (INT8)read_arg8(m_pc + 1));
}
else
{
m_cycles -= 1;
m_pc += 2;
}
do_branch(1, !(m_psw & (FLAG_ZF|FLAG_CF))); // (CF|ZF)=0
break;
// bcc label8
case 0xe6:
if (!(m_psw & FLAG_CF)) // CF=0
{
m_cycles -= 2;
mn102_change_pc(m_pc + 2 + (INT8)read_arg8(m_pc + 1));
}
else
{
m_cycles -= 1;
m_pc += 2;
}
do_branch(1, !(m_psw & FLAG_CF)); // CF=0
break;
// bls label8
case 0xe7:
if (m_psw & (FLAG_ZF|FLAG_CF)) // (CF|ZF)=1
{
m_cycles -= 2;
mn102_change_pc(m_pc + 2 + (INT8)read_arg8(m_pc + 1));
}
else
{
m_cycles -= 1;
m_pc += 2;
}
do_branch(1, m_psw & (FLAG_ZF|FLAG_CF)); // (CF|ZF)=1
break;
// beq label8
case 0xe8:
if (m_psw & FLAG_ZF) // ZF=1
{
m_cycles -= 2;
mn102_change_pc(m_pc + 2 + (INT8)read_arg8(m_pc + 1));
}
else
{
m_cycles -= 1;
m_pc += 2;
}
do_branch(1, m_psw & FLAG_ZF); // ZF=1
break;
// bne label8
case 0xe9:
if (!(m_psw & FLAG_ZF)) // ZF=0
{
m_cycles -= 2;
mn102_change_pc(m_pc + 2 + (INT8)read_arg8(m_pc + 1));
}
else
{
m_cycles -= 1;
m_pc += 2;
}
do_branch(1, !(m_psw & FLAG_ZF)); // ZF=0
break;
// bra label8
case 0xea:
m_cycles -= 2;
mn102_change_pc(m_pc + 2 + (INT8)read_arg8(m_pc + 1));
do_branch(1, true);
break;
// rti
@ -1341,7 +1265,7 @@ void mn10200_device::execute_run()
// ext dn
case 0xc1: case 0xc5: case 0xc9: case 0xcd:
m_cycles -= 3;
m_mdr = m_d[opcode >> 2 & 3] & 0x8000 ? 0xffff : 0x0000;
m_mdr = (m_d[opcode >> 2 & 3] & 0x8000) ? 0xffff : 0x0000;
m_pc += 2;
break;
@ -1654,156 +1578,57 @@ void mn10200_device::execute_run()
// bltx label8
case 0xe0:
if (((m_psw & (FLAG_NX|FLAG_VX)) == FLAG_NX) || ((m_psw & (FLAG_NX|FLAG_VX)) == FLAG_VX)) // (VX^NX)=1
{
m_cycles -= 3;
mn102_change_pc(m_pc + 3 + (INT8)read_arg8(m_pc + 2));
}
else
{
m_cycles -= 2;
m_pc += 3;
}
do_branch(2, ((m_psw & (FLAG_NX|FLAG_VX)) == FLAG_NX) || ((m_psw & (FLAG_NX|FLAG_VX)) == FLAG_VX)); // (VX^NX)=1
break;
// bgtx label8
case 0xe1:
if (((m_psw & (FLAG_ZX|FLAG_NX|FLAG_VX)) == 0) || ((m_psw & (FLAG_ZX|FLAG_NX|FLAG_VX)) == (FLAG_NX|FLAG_VX))) // ((VX^NX)|ZX)=0
{
m_cycles -= 3;
mn102_change_pc(m_pc + 3 + (INT8)read_arg8(m_pc + 2));
}
else
{
m_cycles -= 2;
m_pc += 3;
}
do_branch(2, ((m_psw & (FLAG_ZX|FLAG_NX|FLAG_VX)) == 0) || ((m_psw & (FLAG_ZX|FLAG_NX|FLAG_VX)) == (FLAG_NX|FLAG_VX))); // ((VX^NX)|ZX)=0
break;
// bgex label8
case 0xe2:
if (((m_psw & (FLAG_NX|FLAG_VX)) == 0) || ((m_psw & (FLAG_NX|FLAG_VX)) == (FLAG_NX|FLAG_VX))) // (VX^NX)=0
{
m_cycles -= 3;
mn102_change_pc(m_pc + 3 + (INT8)read_arg8(m_pc + 2));
}
else
{
m_cycles -= 2;
m_pc += 3;
}
do_branch(2, ((m_psw & (FLAG_NX|FLAG_VX)) == 0) || ((m_psw & (FLAG_NX|FLAG_VX)) == (FLAG_NX|FLAG_VX))); // (VX^NX)=0
break;
// blex label8
case 0xe3:
if ((m_psw & FLAG_ZX) || ((m_psw & (FLAG_NX|FLAG_VX)) == FLAG_NX) || ((m_psw & (FLAG_NX|FLAG_VX)) == FLAG_VX)) // ((VX^NX)|ZX)=1
{
m_cycles -= 3;
mn102_change_pc(m_pc + 3 + (INT8)read_arg8(m_pc + 2));
}
else
{
m_cycles -= 2;
m_pc += 3;
}
do_branch(2, (m_psw & FLAG_ZX) || ((m_psw & (FLAG_NX|FLAG_VX)) == FLAG_NX) || ((m_psw & (FLAG_NX|FLAG_VX)) == FLAG_VX)); // ((VX^NX)|ZX)=1
break;
// bcsx label8
case 0xe4:
if (m_psw & FLAG_CX) // CX=1
{
m_cycles -= 3;
mn102_change_pc(m_pc + 3 + (INT8)read_arg8(m_pc + 2));
}
else
{
m_cycles -= 2;
m_pc += 3;
}
do_branch(2, m_psw & FLAG_CX); // CX=1
break;
// bhix label8
case 0xe5:
if (!(m_psw & (FLAG_ZX|FLAG_CX))) // (CX|ZX)=0
{
m_cycles -= 3;
mn102_change_pc(m_pc + 3 + (INT8)read_arg8(m_pc + 2));
}
else
{
m_cycles -= 2;
m_pc += 3;
}
do_branch(2, !(m_psw & (FLAG_ZX|FLAG_CX))); // (CX|ZX)=0
break;
// bccx label8
case 0xe6:
if (!(m_psw & FLAG_CX)) // CX=0
{
m_cycles -= 3;
mn102_change_pc(m_pc + 3 + (INT8)read_arg8(m_pc + 2));
}
else
{
m_cycles -= 2;
m_pc += 3;
}
do_branch(2, !(m_psw & FLAG_CX)); // CX=0
break;
// blsx label8
case 0xe7:
if (m_psw & (FLAG_ZX|FLAG_CX)) // (CX|ZX)=1
{
m_cycles -= 3;
mn102_change_pc(m_pc + 3 + (INT8)read_arg8(m_pc + 2));
}
else
{
m_cycles -= 2;
m_pc += 3;
}
do_branch(2, m_psw & (FLAG_ZX|FLAG_CX)); // (CX|ZX)=1
break;
// beqx label8
case 0xe8:
if (m_psw & FLAG_ZX) // ZX=1
{
m_cycles -= 3;
mn102_change_pc(m_pc + 3 + (INT8)read_arg8(m_pc + 2));
}
else
{
m_cycles -= 2;
m_pc += 3;
}
do_branch(2, m_psw & FLAG_ZX); // ZX=1
break;
// bnex label8
case 0xe9:
if (!(m_psw & FLAG_ZX)) // ZX=0
{
m_cycles -= 3;
mn102_change_pc(m_pc + 3 + (INT8)read_arg8(m_pc + 2));
}
else
{
m_cycles -= 2;
m_pc += 3;
}
do_branch(2, !(m_psw & FLAG_ZX)); // ZX=0
break;
// bnc label8
case 0xfe:
if (!(m_psw & FLAG_NF)) // NF=0
{
m_cycles -= 3;
mn102_change_pc(m_pc + 3 + (INT8)read_arg8(m_pc + 2));
}
else
{
m_cycles -= 2;
m_pc += 3;
}
do_branch(2, !(m_psw & FLAG_NF)); // NF=0
break;
default:

1
src/emu/cpu/mn10200/mn10200.h
View File

@ -159,6 +159,7 @@ private:
UINT32 do_sub(UINT32 a, UINT32 b, UINT32 c);
void test_nz16(UINT16 v);
void do_jsr(UINT32 to, UINT32 ret);
void do_branch(int offset, bool state);
void mn10200_w(UINT32 adr, UINT32 data, int type);
UINT32 mn10200_r(UINT32 adr, int type);
};