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68000: fix bug in CMP instruction >_>

This commit is contained in:
beirich 2011-10-13 02:38:23 +00:00
parent 136cc3158e
commit 0924ad07fd
1 changed files with 6 additions and 7 deletions
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13
BizHawk.Emulation/CPUs/68000/Instructions/IntegerMath.cs
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@ -748,7 +748,6 @@ namespace BizHawk.Emulation.CPUs.M68000
info.Length = pc - info.PC;
}
void CMP()
{
int dReg = (op >> 9) & 7;
@ -761,8 +760,8 @@ namespace BizHawk.Emulation.CPUs.M68000
case 0: // byte
{
sbyte value = ReadValueB(mode, reg);
int result = value - D[dReg].s8;
int uresult = (byte)value - D[dReg].u8;
int result = D[dReg].s8 - value;
int uresult = D[dReg].u8 - (byte)value;
N = (result & 0x80) != 0;
Z = result == 0;
V = result > sbyte.MaxValue || result < sbyte.MinValue;
@ -774,8 +773,8 @@ namespace BizHawk.Emulation.CPUs.M68000
case 1: // word
{
short value = ReadValueW(mode, reg);
int result = value - D[dReg].s16;
int uresult = (ushort)value - D[dReg].u16;
int result = D[dReg].s16 - value;
int uresult = D[dReg].u16 - (ushort)value;
N = (result & 0x8000) != 0;
Z = result == 0;
V = result > short.MaxValue || result < short.MinValue;
@ -787,8 +786,8 @@ namespace BizHawk.Emulation.CPUs.M68000
case 2: // long
{
int value = ReadValueL(mode, reg);
long result = value - D[dReg].s32;
long uresult = (uint)value - D[dReg].u32;
long result = D[dReg].s32 - value;
long uresult = D[dReg].u32 - (uint)value;
N = (result & 0x80000000) != 0;
Z = result == 0;
V = result > int.MaxValue || result < int.MinValue;