a = pgm_read_byte(blake_index_lut+4*i+0);
b = pgm_read_byte(blake_index_lut+4*i+1);
c = pgm_read_byte(blake_index_lut+4*i+2);
d = pgm_read_byte(blake_index_lut+4*i+3);
s0 = pgm_read_byte(blake_sigma+16*r+2*i+0);
s1 = pgm_read_byte(blake_sigma+16*r+2*i+1);
a = pgm_read_byte(blake_index_lut+4*i+0);
b = pgm_read_byte(blake_index_lut+4*i+1);
c = pgm_read_byte(blake_index_lut+4*i+2);
d = pgm_read_byte(blake_index_lut+4*i+3);
s0 = pgm_read_byte(blake_sigma+16*r+2*i+0);
s1 = pgm_read_byte(blake_sigma+16*r+2*i+1);