1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
/*
See license.txt in the root of this project.
*/
# ifndef LMT_ARITHMETIC_H
# define LMT_ARITHMETIC_H
/*tex
Fixed-point arithmetic is done on {\em scaled integers} that are multiples of $2^{-16}$. In
other words, a binary point is assumed to be sixteen bit positions from the right end of a
binary computer word.
*/
extern scaled tex_multiply_and_add (int n, scaled x, scaled y, scaled max_answer);
extern scaled tex_nx_plus_y (int n, scaled x, scaled y);
extern scaled tex_multiply_integers (int n, scaled x);
extern scaled tex_x_over_n_r (scaled x, int n, int *remainder);
extern scaled tex_x_over_n (scaled x, int n);
extern scaled tex_xn_over_d (scaled x, int n, int d);
extern scaled tex_xn_over_d_r (scaled x, int n, int d, int *remainder);
/* scaled tex_divide_scaled (scaled s, scaled m, int dd); */
extern scaled tex_divide_scaled_n (double s, double m, double d);
extern scaled tex_ext_xn_over_d (scaled, scaled, scaled);
extern scaled tex_round_xn_over_d (scaled x, int n, unsigned int d);
inline static scaled tex_round_decimals_digits(const unsigned char *digits, unsigned k)
{
int a = 0;
while (k-- > 0) {
a = (a + digits[k] * two) / 10;
}
return (a + 1) / 2;
}
inline static int tex_half_scaled(int x)
{
return odd(x) ? ((x + 1) / 2) : (x / 2);
}
# endif
|
