[stdlib] Simplify Int.__floordiv__ and friends

Signed-off-by: Yiwu Chen <210at85@gmail.com>

stdlib/src/builtin/int.mojo

@@ -592,14 +592,11 @@ struct Int(
  `floor(self/rhs)` value.
  """
  # This should raise an exception
- var denominator = select(rhs == 0, 1, rhs)
- var div: Int = self._positive_div(denominator)
-
+ var denom = select(rhs == 0, 1, rhs)
+ var div = self._positive_div(denom)
  var mod = self - div * rhs
- var divMod = select(((rhs < 0) ^ (self < 0)) & mod, div - 1, div)
- div = select(self > 0 & rhs > 0, div, divMod)
- div = select(rhs == 0, 0, div)
- return div
+ div = select(((rhs < 0) ^ (self < 0)) & mod, div - 1, div)
+ return select(rhs == 0, 0, div)
 
  @always_inline("nodebug")
  fn __mod__(self, rhs: Int) -> Int:
@@ -611,16 +608,11 @@ struct Int(
  Returns:
  The remainder of dividing self by rhs.
  """
- var denominator = select(rhs == 0, 1, rhs)
- var div: Int = self._positive_div(denominator)
-
+ var denom = select(rhs == 0, 1, rhs)
+ var div = self._positive_div(denom)
  var mod = self - div * rhs
- var divMod = select(((rhs < 0) ^ (self < 0)) & mod, mod + rhs, mod)
- mod = select(
- self > 0 & rhs > 0, self._positive_rem(denominator), divMod
- )
- mod = select(rhs == 0, 0, mod)
- return mod
+ mod = select(((rhs < 0) ^ (self < 0)) & mod, mod + rhs, mod)
+ return select(rhs == 0, 0, mod)
 
  @always_inline("nodebug")
  fn __divmod__(self, rhs: Int) -> Tuple[Int, Int]:
@@ -630,17 +622,9 @@ struct Int(
  rhs: The value to divide on.
 
  Returns:
- The quotient and remainder as a `Tuple(self // rhs, self % rhs)`.
+ The quotient and remainder as a tuple `(self // rhs, self % rhs)`.
  """
- if rhs == 0:
- return 0, 0
- var div: Int = self._positive_div(rhs)
- if rhs > 0 & self > 0:
- return div, self._positive_rem(rhs)
- var mod = self - div * rhs
- if ((rhs < 0) ^ (self < 0)) & mod:
- return div - 1, mod + rhs
- return div, mod
+ return self // rhs, self % rhs
 
  @always_inline("nodebug")
  fn __pow__(self, exp: Self) -> Self: