pio2_3
w = fn * pio2_3;
r -= fn * pio2_3;
pio2_3 = 2.022266248711166455796e-21, /* 2^-69 * 1.3198A2E000000 */
w1 = fn1 * pio2_3 - y1;
w0 = fn0 * pio2_3 - y0;
w0 = fn0 * pio2_3 - y0;
w1 = fn1 * pio2_3 - y1;
w2 = fn2 * pio2_3 - y2;
pio2_3 = 2.022266248711166455796e-21, /* third 33 bits of pi/2 */
w0 = fn0 * pio2_3 - y0;
w1 = fn1 * pio2_3 - y1;
w2 = fn2 * pio2_3 - y2;
pio2_3 = 2.022266248711166455796e-21,
w1 = fn1 * pio2_3 - y1;
w0 = fn0 * pio2_3 - y0;
w1 = fn1 * pio2_3 - y1;
w0 = fn0 * pio2_3 - y0;
pio2_3 = 2.022266248711166455796e-21,
w0 = fn0 * pio2_3 - y0;
w1 = fn1 * pio2_3 - y1;
w2 = fn2 * pio2_3 - y2;
w0 = fn0 * pio2_3 - y0;
w1 = fn1 * pio2_3 - y1;
w2 = fn2 * pio2_3 - y2;
pio2_3 = 2.022266248711166455796e-21,
w1 = fn1 * pio2_3 - y1;
w0 = fn0 * pio2_3 - y0;
w1 = fn1 * pio2_3 - y1;
w0 = fn0 * pio2_3 - y0;
pio2_3 = 2.022266248711166455796e-21, /* third 33 bits of pi/2 */
w0 = fn0 * pio2_3 - y0;
w1 = fn1 * pio2_3 - y1;
w2 = fn2 * pio2_3 - y2;