Lines Matching defs:qx
558 * For better accuracy when x > 0.3, let qx = |x|/4 with
559 * the last 32 bits mask off, and if x > 0.78125, let qx = 0.28125.
561 * cos(x+y) = (1-qx) - ((x*x/2-qx) - (r-x*y)).
562 * Note that 1-qx and (x*x/2-qx) is EXACT here, and the
577 double a,h,z,r,qx=0;
589 qx = 0.28125;
591 set_high(&qx, ix-0x00200000); /* x/4 */
592 set_low(&qx, 0);
594 h = 0.5*z-qx;
595 a = one-qx;