M_PI_2
w = (M_PI_2 - creal (w)) - cimag (w) * I;
w = ((float)M_PI_2 - crealf (w)) - cimagf (w) * I;
w = M_PI_2 + 0.0 * I;
w = (float)M_PI_2 + 0.0f * I;
p1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */
p2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */
p3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */
p4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */
2.0, M_PI_2, 0.0, M_E * M_E,