16 	/* 2 */ fe25519_square(&z2,x);  in fe25519_invert()
17 	/* 4 */ fe25519_square(&t,&z2);  in fe25519_invert()
18 	/* 8 */ fe25519_square(&t,&t);  in fe25519_invert()
21 	/* 22 */ fe25519_square(&t,&z11);  in fe25519_invert()
24 	/* 2^6 - 2^1 */ fe25519_square(&t,&z2_5_0);  in fe25519_invert()
25 	/* 2^20 - 2^10 */ for (i = 1;i < 5;i++) { fe25519_square(&t,&t); }  in fe25519_invert()
28 	/* 2^11 - 2^1 */ fe25519_square(&t,&z2_10_0);  in fe25519_invert()
29 	/* 2^20 - 2^10 */ for (i = 1;i < 10;i++) { fe25519_square(&t,&t); }  in fe25519_invert()
32 	/* 2^21 - 2^1 */ fe25519_square(&t,&z2_20_0);  in fe25519_invert()
33 	/* 2^40 - 2^20 */ for (i = 1;i < 20;i++) { fe25519_square(&t,&t); }  in fe25519_invert()
36 	/* 2^41 - 2^1 */ fe25519_square(&t,&t);  in fe25519_invert()
37 	/* 2^50 - 2^10 */ for (i = 1;i < 10;i++) { fe25519_square(&t,&t); }  in fe25519_invert()
40 	/* 2^51 - 2^1 */ fe25519_square(&t,&z2_50_0);  in fe25519_invert()
41 	/* 2^100 - 2^50 */ for (i = 1;i < 50;i++) { fe25519_square(&t,&t); }  in fe25519_invert()
44 	/* 2^101 - 2^1 */ fe25519_square(&t,&z2_100_0);  in fe25519_invert()
45 	/* 2^200 - 2^100 */ for (i = 1;i < 100;i++) { fe25519_square(&t,&t); }  in fe25519_invert()
48 	/* 2^201 - 2^1 */ fe25519_square(&t,&t);  in fe25519_invert()
49 	/* 2^250 - 2^50 */ for (i = 1;i < 50;i++) { fe25519_square(&t,&t); }  in fe25519_invert()
52 	/* 2^251 - 2^1 */ fe25519_square(&t,&t);  in fe25519_invert()
53 	/* 2^252 - 2^2 */ fe25519_square(&t,&t);  in fe25519_invert()
54 	/* 2^253 - 2^3 */ fe25519_square(&t,&t);  in fe25519_invert()
56 	/* 2^254 - 2^4 */ fe25519_square(&t,&t);  in fe25519_invert()
58 	/* 2^255 - 2^5 */ fe25519_square(&t,&t);  in fe25519_invert()