CPU simulator with display

Instr format:

FF FF FF FF  
__ __ ^^^^ - r3_imm third reg or imm  
__ _^ __ __ - r2 second reg  
__ ^_ __ __ - r1 first reg  
^^__ __ __ - opcode - operation code 

Registers: r0-r15

Memory:

MEM_SIZE = 65536 words (32 bits)  
0x0000 ↓ CODE + DATA  
...  
0x8000 ↑ STACK  
... DISPLAY MEM (32768 words == 256*128 ARGB)  
0xFFFF  

Interfase

For run CPU place assempler in the left window, Load code and Run CPU. During execution you can Pause CPU and check status in the middle (PC and registers) and right (memory) windows. After pause you can execute one instruction with Step CPU, reset with Stop CPU and continue execution with Run CPU.
In the lower left window full ISA description is placed.

Simulator ISA

0x01 EXIT

{ cpu->stop(); }

0x02 B

{ cpu->m_nextPC = m_r3_imm; }

0x03 BL

{ cpu->m_regFile[m_r1] = cpu->m_PC + 1; cpu->m_nextPC = m_r3_imm; }

0x04 BR

{ cpu->m_nextPC = cpu->m_regFile[m_r1]; }

0x05 B.EQ

{ if (cpu->m_regFile[m_r1] == cpu->m_regFile[m_r2]) { cpu->m_nextPC = m_r3_imm; } }

0x06 B.NE

{ if (cpu->m_regFile[m_r1] != cpu->m_regFile[m_r2]) { cpu->m_nextPC = m_r3_imm; } }

0x07 B.GT

{ if ((int32_t)cpu->m_regFile[m_r1] > (int32_t)cpu->m_regFile[m_r2]) { cpu->m_nextPC = m_r3_imm; } }

0x08 B.LE

{ if ((int32_t)cpu->m_regFile[m_r1] m_regFile[m_r2]) { cpu->m_nextPC = m_r3_imm; } }

0x09 B.GTU

{ if (cpu->m_regFile[m_r1] > cpu->m_regFile[m_r2]) { cpu->m_nextPC = m_r3_imm; } }

0x10 B.LEU

{ if (cpu->m_regFile[m_r1] m_regFile[m_r2]) { cpu->m_nextPC = m_r3_imm; } }

0x11 MOV

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2]; }

0x12 MOVli

{ cpu->m_regFile[m_r1] = m_r3_imm; }

0x13 MOVhi

{ cpu->m_regFile[m_r1] = m_r3_imm

0x20 NEG

{ cpu->m_regFile[m_r1] = -cpu->m_regFile[m_r2]; }

0x21 ADD

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] + cpu->m_regFile[m_r3_imm]; }

0x22 SUB

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] - cpu->m_regFile[m_r3_imm]; }

0x23 MUL

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] * cpu->m_regFile[m_r3_imm]; }

0x24 DIV

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] / cpu->m_regFile[m_r3_imm]; }

0x25 DIVrem

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] % cpu->m_regFile[m_r3_imm]; }

0x26 POW

{ cpu->m_regFile[m_r1] = pow(cpu->m_regFile[m_r2], cpu->m_regFile[m_r3_imm]); }

0x31 ADDi

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] + (int16_t)m_r3_imm; }

0x32 SUBi

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] - (int16_t)m_r3_imm; }

0x33 MULi

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] * (int16_t)m_r3_imm; }

0x34 divi

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] / (int16_t)m_r3_imm; }

0x35 DIV_REMi

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] % (int16_t)m_r3_imm; }

0x36 POWi

{ cpu->m_regFile[m_r1] = pow(cpu->m_regFile[m_r2], (int16_t)m_r3_imm); }

0x37 POWi_

{ cpu->m_regFile[m_r1] = pow((int16_t)m_r3_imm, cpu->m_regFile[m_r2]); }

0x40 NOT

{ cpu->m_regFile[m_r1] = ~cpu->m_regFile[m_r2]; }

0x41 AND

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] & cpu->m_regFile[m_r3_imm]; }

0x42 OR

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] | cpu->m_regFile[m_r3_imm]; }

0x43 XOR

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] ^ cpu->m_regFile[m_r3_imm]; }

0x44 SHL

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] m_regFile[m_r3_imm]; }

0x45 SHR

{ cpu->m_regFile[m_r1] = (uint32_t)cpu->m_regFile[m_r2] >> cpu->m_regFile[m_r3_imm]; }

0x46 SHRA

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] >> cpu->m_regFile[m_r3_imm]; }

0x51 ANDi

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] & (int16_t)m_r3_imm; }

0x52 ORi

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] | (int16_t)m_r3_imm; }

0x53 XORi

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] ^ (int16_t)m_r3_imm; }

0x54 SHLi

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2]

0x55 SHRi

{ cpu->m_regFile[m_r1] = (uint32_t)cpu->m_regFile[m_r2] >> m_r3_imm; }

0x56 SHRAi

{ cpu->m_regFile[m_r1] = cpu->m_regFile[m_r2] >> m_r3_imm; }

0x61 ADDf

{ cpu->m_regFile[m_r1] = (int32_t)((float)cpu->m_regFile[m_r2] + (float)cpu->m_regFile[m_r3_imm]); }

0x62 SUBf

{ cpu->m_regFile[m_r1] = (int32_t)((float)cpu->m_regFile[m_r2] - (float)cpu->m_regFile[m_r3_imm]); }

0x63 MULf

{ cpu->m_regFile[m_r1] = (int32_t)((float)cpu->m_regFile[m_r2] * (float)cpu->m_regFile[m_r3_imm]); }

0x64 DIVf

{ cpu->m_regFile[m_r1] = (int32_t)((float)cpu->m_regFile[m_r2] / (float)cpu->m_regFile[m_r3_imm]); }

0x65 POWf

{ cpu->m_regFile[m_r1] = (int32_t)(pow((float)cpu->m_regFile[m_r2], (float)cpu->m_regFile[m_r3_imm])); }

0x70 LD

{ cpu->m_regFile[m_r1] = cpu->readMem(cpu->m_regFile[m_r2] + cpu->m_regFile[m_r3_imm]); }

0x71 ST

{ cpu->readMem(cpu->m_regFile[m_r2] + cpu->m_regFile[m_r3_imm]) = cpu->m_regFile[m_r1]; }

0x72 LDi

{ cpu->m_regFile[m_r1] = cpu->readMem(cpu->m_regFile[m_r2] + (int16_t)m_r3_imm); }

0x73 STi

{ cpu->readMem(cpu->m_regFile[m_r2] + (int16_t)m_r3_imm) = cpu->m_regFile[m_r1]; }

0x80 FLUSH

{ cpu->updateDisplay(); QThread::usleep(10); }

0x81 RAND

{ cpu->m_regFile[m_r1] = QRandomGenerator::global()->generate(); }

0x82 BKPT

{ cpu->pause(); }