public void TestIMUL()
{
i8086CPU cpu = GetCPU(new byte[] { 0xf6, 0xeb }); /* IMUL BL */
cpu.EU.Registers.AL = 0xfe;
cpu.EU.Registers.BL = 0xfc;
cpu.NextInstruction();
Assert.AreEqual(0x08, cpu.EU.Registers.AX, "IMUL AX result failed");
cpu = GetCPU(new byte[] { 0xf6, 0xeb }); /* IMUL BL */
cpu.EU.Registers.AL = 48;
cpu.EU.Registers.BL = 4;
cpu.NextInstruction();
Assert.AreEqual(0xc0, cpu.EU.Registers.AX, "IMUL 2 AX result failed");
Assert.AreEqual(true, cpu.EU.CondReg.OverflowFlag, "IMUL 2 OF failed");
cpu = GetCPU(new byte[] { 0xf6, 0xeb }); /* IMUL BL */
cpu.EU.Registers.AL = 0xfc; // -4
cpu.EU.Registers.BL = 4;
cpu.NextInstruction();
Assert.AreEqual(0xfff0, cpu.EU.Registers.AX, "IMUL 3 AX result failed");
Assert.AreEqual(false, cpu.EU.CondReg.OverflowFlag, "IMUL 3 OF failed");
cpu = GetCPU(new byte[] { 0xf7, 0xeb }); /* IMUL BX */
cpu.EU.Registers.AX = 48;
cpu.EU.Registers.BX = 4;
cpu.NextInstructionDebug();
Assert.AreEqual(0x00, cpu.EU.Registers.DX, "IMUL 4 DX result failed");
Assert.AreEqual(0xc0, cpu.EU.Registers.AX, "IMUL 4 AX result failed");
Assert.AreEqual(false, cpu.EU.CondReg.OverflowFlag, "IMUL 4 OF failed");
}
public void TestIDIV()
{
i8086CPU cpu = GetCPU(new byte[] { 0xf6, 0xfb }); /* IDIV BL */
cpu.EU.Registers.AX = 0xffd0; // -48
cpu.EU.Registers.BL = 0x05; // 5
// result AL = -9, AH = -3
cpu.NextInstruction();
Assert.AreEqual(0xf7, cpu.EU.Registers.AL, "IDIV AL result failed");
Assert.AreEqual(0xfd, cpu.EU.Registers.AH, "IDIV AH result failed");
cpu = GetCPU(new byte[] { 0xf6, 0xfb }); /* IDIV BL */
cpu.EU.Registers.AX = 0xff35; // -203
cpu.EU.Registers.BL = 0x04; // 4
cpu.NextInstruction();
//AL = -50, AH = -3
Assert.AreEqual(0xce, cpu.EU.Registers.AL, "IDIV 2 AL result failed");
Assert.AreEqual(0xfd, cpu.EU.Registers.AH, "IDIV 2 AH result failed");
cpu = GetCPU(new byte[] { 0xf7, 0xfb }); /* IDIV BX */
cpu.EU.Registers.DX = 0xffff; // sign extend AX
cpu.EU.Registers.AX = 0xec78; // -5000
cpu.EU.Registers.BX = 256;
cpu.NextInstructionDebug();
// AX = -19, DX = -136
Assert.AreEqual(0xffed, cpu.EU.Registers.AX, "IDIV 3 AX result failed");
Assert.AreEqual(0xff78, cpu.EU.Registers.DX, "IDIV 3 DX result failed");
}
public void TestDIV()
{
i8086CPU cpu = GetCPU(new byte[] { 0xf6, 0xf3 }); /* DIV BL */
cpu.EU.Registers.AX = 0xcb;
cpu.EU.Registers.BL = 0x04;
cpu.NextInstruction();
Assert.AreEqual(0x32, cpu.EU.Registers.AL, "DIV AL result failed");
Assert.AreEqual(0x03, cpu.EU.Registers.AH, "DIV AH result failed");
cpu = GetCPU(new byte[] { 0xf7, 0xf3 }); /* DIV BX */
cpu.EU.Registers.DX = 0;
cpu.EU.Registers.AX = 5;
cpu.EU.Registers.BX = 2;
cpu.NextInstructionDebug();
Assert.AreEqual(0x02, cpu.EU.Registers.AX, "DIV 2 AX result failed");
Assert.AreEqual(0x01, cpu.EU.Registers.DX, "DIV 2 DX result failed");
}
