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9#include <stdio.h>
10#include <stdlib.h>
11#include <math.h>
12#include <float.h>
13#include <fenv.h>
14
15#include "float_helpers.h"
16
17#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
18
19typedef struct {
20 int flag;
21 char *desc;
22} float_mapping;
23
24float_mapping round_flags[] = {
25 { FE_TONEAREST, "to nearest" },
26#ifdef FE_UPWARD
27 { FE_UPWARD, "upwards" },
28#endif
29#ifdef FE_DOWNWARD
30 { FE_DOWNWARD, "downwards" },
31#endif
32#ifdef FE_TOWARDZERO
33 { FE_TOWARDZERO, "to zero" }
34#endif
35};
36
37
38static void print_inputs(float a, float b, float c)
39{
40 char *a_fmt, *b_fmt, *c_fmt;
41
42 a_fmt = fmt_f32(a);
43 b_fmt = fmt_f32(b);
44 c_fmt = fmt_f32(c);
45
46 printf("op : %s * %s + %s\n", a_fmt, b_fmt, c_fmt);
47
48 free(a_fmt);
49 free(b_fmt);
50 free(c_fmt);
51}
52
53static void print_result(float r, int j, int k)
54{
55 char *r_fmt, *flag_fmt;
56
57 r_fmt = fmt_f32(r);
58 flag_fmt = fmt_flags();
59
60 printf("res: %s flags=%s (%d/%d)\n", r_fmt, flag_fmt, j, k);
61
62 free(r_fmt);
63 free(flag_fmt);
64}
65
66static void do_madds(float a, float b, float c, int j, int k)
67{
68 float r;
69
70 print_inputs(a, b, c);
71
72 feclearexcept(FE_ALL_EXCEPT);
73 r = __builtin_fmaf(a, b, c);
74
75 print_result(r, j, k);
76}
77
78int main(int argc, char *argv[argc])
79{
80 int i, j, k, nums = get_num_f32();
81 float a, b, c;
82
83 for (i = 0; i < ARRAY_SIZE(round_flags); ++i) {
84 if (fesetround(round_flags[i].flag) != 0) {
85 printf("### Rounding %s skipped\n", round_flags[i].desc);
86 continue;
87 }
88 printf("### Rounding %s\n", round_flags[i].desc);
89 for (j = 0; j < nums; j++) {
90 for (k = 0; k < 3; k++) {
91 a = get_f32(j + ((k)%3));
92 b = get_f32(j + ((k+1)%3));
93 c = get_f32(j + ((k+2)%3));
94 do_madds(a, b, c, j, k);
95 }
96 }
97
98
99 printf("# LP184149\n");
100 do_madds(0x1.ffffffffffffcp-1022, 0x1.0000000000001p-1, 0x0.0000000000001p-1022, j, 0);
101 do_madds(0x8p-152, 0x8p-152, 0x8p-152, j+1, 0);
102 }
103
104 return 0;
105}
106
