P2
P2 = 1.621429720105354466140, /* 0x3ff9f160, 0x4a49d6c2 */
t = t*((P0+r*(P1+r*P2))+((r*r)*r)*(P3+r*P4));
r = t_lo + (t_hi + t_lo) * z * (P1 + z * (P2 + z * (P3 + z * (P4
P2 = 0x1.ebfbdff82c58ea86f16b06ec9736p-3L,
P2 = 0x1.ebfbdff82c58fp-3,
r = t + t * z * (P1 + z * (P2 + z * (P3 + z * (P4 + z * (P5 + z * (P6
px = (((( P4 * x + P3) * x + P2) * x + P1) * x + P0) * x;
P2 = -3.423199068835684263987132888286791620673E2L,