Comparisons

%%capture
%run utils.ipynb

---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
File ~/.local/share/mise/installs/python/3.13.3/lib/python3.13/site-packages/IPython/core/magics/execution.py:727, in ExecutionMagics.run(self, parameter_s, runner, file_finder)
    726     fpath = arg_lst[0]
--> 727     filename = file_finder(fpath)
    728 except IndexError as e:

File ~/.local/share/mise/installs/python/3.13.3/lib/python3.13/site-packages/IPython/utils/path.py:90, in get_py_filename(name)
     89         return py_name
---> 90 raise IOError("File `%r` not found." % name)

OSError: File `'utils.ipynb'` not found.

The above exception was the direct cause of the following exception:

Exception                                 Traceback (most recent call last)
Cell In[1], line 1
----> 1 get_ipython().run_line_magic('run', 'utils.ipynb')

File ~/.local/share/mise/installs/python/3.13.3/lib/python3.13/site-packages/IPython/core/interactiveshell.py:2486, in InteractiveShell.run_line_magic(self, magic_name, line, _stack_depth)
   2484     kwargs['local_ns'] = self.get_local_scope(stack_depth)
   2485 with self.builtin_trap:
-> 2486     result = fn(*args, **kwargs)
   2488 # The code below prevents the output from being displayed
   2489 # when using magics with decorator @output_can_be_silenced
   2490 # when the last Python token in the expression is a ';'.
   2491 if getattr(fn, magic.MAGIC_OUTPUT_CAN_BE_SILENCED, False):

File ~/.local/share/mise/installs/python/3.13.3/lib/python3.13/site-packages/IPython/core/magics/execution.py:738, in ExecutionMagics.run(self, parameter_s, runner, file_finder)
    736     if os.name == 'nt' and re.match(r"^'.*'$",fpath):
    737         warn('For Windows, use double quotes to wrap a filename: %run "mypath\\myfile.py"')
--> 738     raise Exception(msg) from e
    739 except TypeError:
    740     if fpath in sys.meta_path:

Exception: File `'utils.ipynb'` not found.

Comparisons#

Very similar to the arithmetic opcodes. But rather than adding or subtracting values we compare them.

Less than#

def lt(evm):
    a, b = evm.stack.pop(), evm.stack.pop()
    evm.stack.push(1 if a < b else 0)
    evm.pc += 1
    evm.gas_dec(3)

Signed Less than#

def slt(evm): # signed less than
    a, b = evm.stack.pop(), evm.stack.pop()
    a = unsigned_to_signed(a)
    b = unsigned_to_signed(b)
    evm.stack.push(1 if a < b else 0)
    evm.pc += 1
    evm.gas_dec(3)

Greater than#

def gt(evm): # greater than
    a, b = evm.stack.pop(), evm.stack.pop()
    evm.stack.push(1 if a > b else 0)
    evm.pc += 1
    evm.gas_dec(3)

Signed Greater than#

def sgt(evm):
    a, b = evm.stack.pop(), evm.stack.pop()
    a = unsigned_to_signed(a)
    b = unsigned_to_signed(b)
    evm.stack.push(1 if a > b else 0)
    evm.pc += 1
    evm.gas_dec(3)

Equal#

def eq(evm):
    a, b = cpu.stack.pop(), cpu.stack.pop()
    cpu.stack.push(1 if a == b else 0)
    cpu.pc += 1
    cpu.gas_dec(3)

Is Zero#

def iszero(evm):
    a = evm.stack.pop()
    evm.stack.push(1 if a == 0 else 0)
    evm.pc += 1
    evm.gas_dec(3)
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