Testing $itor() in a constant context.
  $itor(10)   = 10
  $itor(1'bx) = 0
  $itor(1'bx) = 0
  $itor(10.4) = 10
  $itor(10.5) = 11
  $itor(-1.4) = -1
  $itor(-1.5) = -2
  $itor(NaN)  = 0
  $itor(+inf) = 0
  $itor(-inf) = 0

Testing $itor() in a variable context.
  $itor(10)   = 10
  $itor(1'bx) = 0
  $itor(1'bx) = 0
  $itor(10.4) = 10
  $itor(10.5) = 11
  $itor(-1.4) = -1
  $itor(-1.5) = -2
  $itor(NaN)  = 0
  $itor(+inf) = 0
  $itor(-inf) = 0

Testing $rtoi() in a constant context.
  $rtoi(1.1)  = 1
  $rtoi(1.9)  = 1
  $rtoi(-1.1) = -1
  $rtoi(-1.9) = -1
  Overflow(0) = 0
  Overflow(1) = 1
  $rtoi(NaN)  = x
  $rtoi(+inf) = x
  $rtoi(-inf) = x
  $rtoi(1)    = 1
  $rtoi(1'bx) = 0
  $rtoi(1'bz) = 0

Testing $rtoi() in a variable context.
  $rtoi(1.1)  = 1
  $rtoi(1.9)  = 1
  $rtoi(-1.1) = -1
  $rtoi(-1.9) = -1
  Overflow(0) = 0
  Overflow(1) = 1
  $rtoi(NaN)  = x
  $rtoi(+inf) = x
  $rtoi(-inf) = x
  $rtoi(1)    = 1
  $rtoi(1'bx) = 0
  $rtoi(1'bz) = 0