1#include "fe.h"
2
3/*
4return 1 if f is in {1,3,5,...,q-2}
5return 0 if f is in {0,2,4,...,q-1}
6
7Preconditions:
8 |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
9*/
10
11int fe_isnegative(const fe f)
12{
13 unsigned char s[32];
14 fe_tobytes(s,f);
15 return s[0] & 1;
16}
17