Improve performance some Float methods [Feature #17498] (#4018)

Merged-By: k0kubun <takashikkbn@gmail.com>

numeric.rb

@@ -0,0 +1,207 @@
+class Integer
+  # call-seq:
+  #    -int  ->  integer
+  #
+  # Returns +int+, negated.
+  def -@
+    Primitive.attr! 'inline'
+    Primitive.cexpr! 'rb_int_uminus(self)'
+  end
+
+  # call-seq:
+  #   ~int  ->  integer
+  #
+  # One's complement: returns a number where each bit is flipped.
+  #
+  # Inverts the bits in an Integer. As integers are conceptually of
+  # infinite length, the result acts as if it had an infinite number of
+  # one bits to the left. In hex representations, this is displayed
+  # as two periods to the left of the digits.
+  #
+  #   sprintf("%X", ~0x1122334455)    #=> "..FEEDDCCBBAA"
+  def ~
+    Primitive.attr! 'inline'
+    Primitive.cexpr! 'rb_int_comp(self)'
+  end
+
+  def abs
+    Primitive.attr! 'inline'
+    Primitive.cexpr! 'rb_int_abs(self)'
+  end
+
+  # call-seq:
+  #    int.bit_length  ->  integer
+  #
+  # Returns the number of bits of the value of +int+.
+  #
+  # "Number of bits" means the bit position of the highest bit
+  # which is different from the sign bit
+  # (where the least significant bit has bit position 1).
+  # If there is no such bit (zero or minus one), zero is returned.
+  #
+  # I.e. this method returns <i>ceil(log2(int < 0 ? -int : int+1))</i>.
+  #
+  #    (-2**1000-1).bit_length   #=> 1001
+  #    (-2**1000).bit_length     #=> 1000
+  #    (-2**1000+1).bit_length   #=> 1000
+  #    (-2**12-1).bit_length     #=> 13
+  #    (-2**12).bit_length       #=> 12
+  #    (-2**12+1).bit_length     #=> 12
+  #    -0x101.bit_length         #=> 9
+  #    -0x100.bit_length         #=> 8
+  #    -0xff.bit_length          #=> 8
+  #    -2.bit_length             #=> 1
+  #    -1.bit_length             #=> 0
+  #    0.bit_length              #=> 0
+  #    1.bit_length              #=> 1
+  #    0xff.bit_length           #=> 8
+  #    0x100.bit_length          #=> 9
+  #    (2**12-1).bit_length      #=> 12
+  #    (2**12).bit_length        #=> 13
+  #    (2**12+1).bit_length      #=> 13
+  #    (2**1000-1).bit_length    #=> 1000
+  #    (2**1000).bit_length      #=> 1001
+  #    (2**1000+1).bit_length    #=> 1001
+  #
+  # This method can be used to detect overflow in Array#pack as follows:
+  #
+  #    if n.bit_length < 32
+  #      [n].pack("l") # no overflow
+  #    else
+  #      raise "overflow"
+  #    end
+  def bit_length
+    Primitive.attr! 'inline'
+    Primitive.cexpr! 'rb_int_bit_length(self)'
+  end
+
+  #  call-seq:
+  #     int.even?  ->  true or false
+  #
+  #  Returns +true+ if +int+ is an even number.
+  def even?
+    Primitive.attr! 'inline'
+    Primitive.cexpr! 'rb_int_even_p(self)'
+  end
+
+  #  call-seq:
+  #     int.integer?  ->  true
+  #
+  #  Since +int+ is already an Integer, this always returns +true+.
+  def integer?
+    return true
+  end
+
+  def magnitude
+    Primitive.attr! 'inline'
+    Primitive.cexpr! 'rb_int_abs(self)'
+  end
+
+  #  call-seq:
+  #     int.odd?  ->  true or false
+  #
+  #  Returns +true+ if +int+ is an odd number.
+  def odd?
+    Primitive.attr! 'inline'
+    Primitive.cexpr! 'rb_int_odd_p(self)'
+  end
+
+  #  call-seq:
+  #     int.ord  ->  self
+  #
+  #  Returns the +int+ itself.
+  #
+  #     97.ord   #=> 97
+  #
+  #  This method is intended for compatibility to character literals
+  #  in Ruby 1.9.
+  #
+  #  For example, <code>?a.ord</code> returns 97 both in 1.8 and 1.9.
+  def ord
+    return self
+  end
+
+  #  call-seq:
+  #     int.to_i    ->  integer
+  #
+  #  Since +int+ is already an Integer, returns +self+.
+  #
+  #  #to_int is an alias for #to_i.
+  def to_i
+    return self
+  end
+
+  #  call-seq:
+  #     int.to_int  ->  integer
+  #
+  #  Since +int+ is already an Integer, returns +self+.
+  def to_int
+    return self
+  end
+
+  # call-seq:
+  #    int.zero? -> true or false
+  #
+  # Returns +true+ if +int+ has a zero value.
+  def zero?
+    Primitive.attr! 'inline'
+    Primitive.cexpr! 'rb_int_zero_p(self)'
+  end
+end
+
+class Float
+  #
+  # call-seq:
+  #    float.to_f  ->  self
+  #
+  # Since +float+ is already a Float, returns +self+.
+  #
+  def to_f
+    return self
+  end
+
+  #
+  #  call-seq:
+  #     float.abs        ->  float
+  #     float.magnitude  ->  float
+  #
+  #  Returns the absolute value of +float+.
+  #
+  #     (-34.56).abs   #=> 34.56
+  #     -34.56.abs     #=> 34.56
+  #     34.56.abs      #=> 34.56
+  #
+  #  Float#magnitude is an alias for Float#abs.
+  #
+  def abs
+    Primitive.attr! 'inline'
+    Primitive.cexpr! 'rb_float_abs(self)'
+  end
+
+  def magnitude
+    Primitive.attr! 'inline'
+    Primitive.cexpr! 'rb_float_abs(self)'
+  end
+
+  #
+  # call-seq:
+  #    -float  ->  float
+  #
+  # Returns +float+, negated.
+  #
+  def -@
+    Primitive.attr! 'inline'
+    Primitive.cexpr! 'rb_float_uminus(self)'
+  end
+
+  #
+  #  call-seq:
+  #     float.zero?  ->  true or false
+  #
+  #  Returns +true+ if +float+ is 0.0.
+  #
+  def zero?
+    Primitive.attr! 'inline'
+    Primitive.cexpr! 'flo_iszero(self) ? Qtrue : Qfalse'
+  end
+end