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Update README.md with example formula calculation

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Bartłomiej Przemysław Pluta
2021-11-09 21:31:48 +01:00
parent ae2ff96cb7
commit 8880fcae8a
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README.md
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@@ -28,3 +28,66 @@ List of available instructions:
| ``0x16`` | ``IN`` | Read input from stdin | | ``0x16`` | ``IN`` | Read input from stdin |
| ``0x17`` | ``OUT`` | Put top stack value to stdout as char | | ``0x17`` | ``OUT`` | Put top stack value to stdout as char |
| ``0x18`` | ``CLR x`` | Wipe out ``x`` values before the top value from the stack | | ``0x18`` | ``CLR x`` | Wipe out ``x`` values before the top value from the stack |
## Example
The `2*3+5` formula written as the MVM assembly code:
```asm
main: push 2
push 3
call &prd
clr 2
push 5
call &sum
clr 2
halt
sum: ld 0
ld 1
add
ret
prd: ld 0
ld 1
mul
ret
```
The result of execution with the `debug = True` flag:
```
VM {_pc = 0, _fp = -1, _stack = fromList [], _halt = False, _debug = True}
0: Push 2
VM {_pc = 2, _fp = -1, _stack = fromList [2], _halt = False, _debug = True}
2: Push 3
VM {_pc = 4, _fp = -1, _stack = fromList [3,2], _halt = False, _debug = True}
4: Call 21
VM {_pc = 21, _fp = 2, _stack = fromList [6,-1,3,2], _halt = False, _debug = True}
21: Ld 0
VM {_pc = 23, _fp = 2, _stack = fromList [3,6,-1,3,2], _halt = False, _debug = True}
23: Ld 1
VM {_pc = 25, _fp = 2, _stack = fromList [2,3,6,-1,3,2], _halt = False, _debug = True}
25: Mul
VM {_pc = 26, _fp = 2, _stack = fromList [6,6,-1,3,2], _halt = False, _debug = True}
26: Ret
VM {_pc = 6, _fp = -1, _stack = fromList [6,3,2], _halt = False, _debug = True}
6: Clr 2
VM {_pc = 8, _fp = -1, _stack = fromList [6], _halt = False, _debug = True}
8: Push 5
VM {_pc = 10, _fp = -1, _stack = fromList [5,6], _halt = False, _debug = True}
10: Call 15
VM {_pc = 15, _fp = 2, _stack = fromList [12,-1,5,6], _halt = False, _debug = True}
15: Ld 0
VM {_pc = 17, _fp = 2, _stack = fromList [5,12,-1,5,6], _halt = False, _debug = True}
17: Ld 1
VM {_pc = 19, _fp = 2, _stack = fromList [6,5,12,-1,5,6], _halt = False, _debug = True}
19: Add
VM {_pc = 20, _fp = 2, _stack = fromList [11,12,-1,5,6], _halt = False, _debug = True}
20: Ret
VM {_pc = 12, _fp = -1, _stack = fromList [11,5,6], _halt = False, _debug = True}
12: Clr 2
VM {_pc = 14, _fp = -1, _stack = fromList [11], _halt = False, _debug = True}
14: Halt
Done:
VM {_pc = 14, _fp = -1, _stack = fromList [11], _halt = True, _debug = True}
```