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This is a small homework to expose you to the hcl2d tool we’ll use for the next several labs and homeworks.

1 Write ir.hcl

To start exploring HCL, create a simulator that handles the irmovq instruction and halt.

1. Have a register for the program counter.
2. Fetch and split each instruction. You’ll need to check the icode to ensure it is IRMOVQ and also get rB and valC.
3. If the instruction is an IRMOVQ, send valC to the register file as the new value for register number rB. If it is not IRMOVQ, do not do this register write!
4. If the instruction is a HALT, halt.
5. You may do anything you wish for other instructions; we will not test them.

1.1 Examples

If you run your simulator with the -q flag on y86/irmovq.yo, you should see

+----------------------- halted in state: ------------------------------+
| RAX:              222   RCX:                2   RDX:               22 |
| RBX:                0   RSP:                0   RBP:                0 |
| RSI:                0   RDI:                0   R8:                 0 |
| R9:                 0   R10:                0   R11:                0 |
| R12:                0   R13:                0   R14: fedcba9876543210 |
| register pP(N) { pc=0000000000000033 }                                |
| used memory:   _0 _1 _2 _3  _4 _5 _6 _7   _8 _9 _a _b  _c _d _e _f    |
|  0x0000000_:   30 f0 01 00  00 00 00 00   00 00 30 f1  02 00 00 00    |
|  0x0000001_:   00 00 00 00  30 f2 22 00   00 00 00 00  00 00 30 f0    |
|  0x0000002_:   22 02 00 00  00 00 00 00   30 fe 10 32  54 76 98 ba    |
|  0x0000003_:   dc fe                                                  |
+--------------------- (end of halted state) ---------------------------+
Cycles run: 6

If you see 0 in RAX instead of 222 it is likely that you’re writing to the register file for halt as well as irmovq.

2 Submit

Submit a file named ir.hcl on the submission page.