Nimrod's Times.EpochTime doesn't seem to measure correctly.

gistfile1.nim

import StrUtils, Times


type Vector = tuple[x, y, z, w:float]

proc new(T:typedesc[Vector], x, y, z, w:float): Vector {.noSideEffect, noInit, inline.} =
  result.x = x
  result.y = y
  result.z = z
  result.w = w

proc `$`(this:Vector): string {.noSideEffect, inline.} =
  return 
    $(this.x) & ", " &
    $(this.y) & ", " &
    $(this.z) & ", " &
    $(this.w)

proc `+=`(this:var Vector, vec:Vector) {.noSideEffect, inline.} =
  this.x += vec.x
  this.y += vec.y
  this.z += vec.z
  this.w += vec.w

proc `-=`(this:var Vector, vec:Vector) {.noSideEffect, inline.} =
  this.x -= vec.x
  this.y -= vec.y
  this.z -= vec.z
  this.w -= vec.w


proc benchmark =
  var
    a = Vector.new(0, 0, 0, 0)
    b = Vector.new(1, 1, 1, 1)
    sum: float
  let
    count = stdin.readLine().parseInt()
    repeat = stdin.readLine().parseInt() * 1000
  
  for c in 0 .. count:
    let start = epochTime()
    for t in 0 .. repeat:
      a += b
      b -= a
    sum += epochTime() - start
  
  echo a
  echo b
  echo "result: ", (sum / count.float)


benchmark()