formula">Machin's
  formula</a> on x86 GNU systems. This formula has two terms with arc
  tangent which can be independently calculated. In this example,
  these two terms are computed using vector
  functions. <b class="type">__float128</b> data type is defined on
  x86, and you can use literals in this type to initialize the
  variables. Variables <i class="var">q0</i>, <i class="var">q1</i>, <i class="var">q2</i>
  and <i class="var">q3</i> retain two QP FP values each. At line 5, 8
  and 11, QP values i