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
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
--- pi_fft.c 2010-07-30 13:04:25.000000000 +0900
+++ pi_fft_mod.c 2010-07-31 20:50:11.000000000 +0900
@@ -25,7 +25,75 @@
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
+#include <sys/time.h>
+#include <unistd.h>
+/****/
+
+#include <stdint.h>
+#include "SIMDBase.h"
+#include "DFT.h"
+
+DFT* dft[64];
+
+void initdft(int n) {
+ int i, logn = 31 - __builtin_clz(n), writeflag = 0;
+ char buf[20], fn[256];
+ gethostname(buf, 19);
+ sprintf(fn, "nsfftplan.%s.txt", buf);
+ FILE *fp = fopen(fn, "r");
+ if (fp != NULL) {
+ for(i=1;i<=logn;i++) {
+ int err;
+ dft[i] = DFT_fread(fp, &err);
+ if (err != DFT_ERROR_NOERROR) {
+ printf("error when reading plan %d : %d\n", i, err);
+ break;
+ }
+ if (DFT_getPlanParamInt(DFT_PARAMID_MODE, dft[i]) != SIMDBase_MODE_PUREC_DOUBLE ||
+ DFT_getPlanParamInt(DFT_PARAMID_FFT_LENGTH, dft[i]) != (1 << i) ||
+ DFT_getPlanParamInt(DFT_PARAMID_IS_ALT_REAL_TRANSFORM, dft[i]) != 1) {
+ fprintf(stderr, "plan not compatible : %d\n", i);
+ break;
+ }
+ }
+ }
+ if (fp != NULL) fclose(fp);
+
+ for(i=1;i<=logn;i++) {
+ if (dft[i] == NULL) {
+ dft[i] = DFT_init(SIMDBase_MODE_PUREC_DOUBLE, 1 << i, DFT_FLAG_ALT_REAL | DFT_FLAG_LIGHT_TEST_RUN | DFT_FLAG_VERBOSE);
+ if (dft[i] == NULL) {
+ printf("dft[%d] == NULL\n", i);
+ exit(-1);
+ }
+ writeflag = 1;
+ }
+ }
+
+ if (writeflag) {
+ fp = fopen(fn, "w");
+ if (fp != NULL) {
+ for(i=1;i<=logn;i++) {
+ DFT_fwrite(dft[i], fp);
+ }
+ fclose(fp);
+ }
+ }
+}
+
+void rdft(int n, int isgn, double *a, int *ip, double *w) {
+ int logn = 31 - __builtin_clz(n);
+ DFT_execute(dft[logn], SIMDBase_MODE_PUREC_DOUBLE, a, isgn);
+}
+
+double timeofday(void) {
+ struct timeval tp;
+ gettimeofday(&tp, NULL);
+ return (double)tp.tv_sec+(1e-6)*tp.tv_usec;
+}
+
+/****/
void mp_load_0(int n, int radix, int out[]);
void mp_load_1(int n, int radix, int out[]);
@@ -67,7 +135,7 @@
double err, d_time, n_op;
int *a, *b, *c, *e, *i1, *i2, *ip;
double *d1, *d2, *d3, *w;
- time_t t_1, t_2;
+ double t_1, t_2;
FILE *f_log, *f_out;
f_log = fopen("pi.log", "w");
@@ -96,6 +164,8 @@
exit(1);
}
ip[0] = 0;
+
+ initdft(nfft);
/* ---- radix test ---- */
log10_radix = 1;
radix = 10;
@@ -111,7 +181,7 @@
printf("calculating %d digits of PI...\n", log10_radix * (n - 2));
fprintf(f_log, "calculating %d digits of PI...\n", log10_radix * (n - 2));
/* ---- time check ---- */
- time(&t_1);
+ t_1 = timeofday();
/*
* ---- a formula based on the AGM (Arithmetic-Geometric Mean) ----
* c = sqrt(0.125);
@@ -216,10 +286,10 @@
mp_mul(n, radix, a, b, a, i1, nfft, d1, d2, d3, ip, w);
mp_idiv(n, radix, a, npow, a);
/* ---- time check ---- */
- time(&t_2);
+ t_2 = timeofday();
/* ---- output ---- */
f_out = fopen("pi_mod.dat", "w");
- printf("writing pi.dat...\n");
+ printf("writing pi_mod.dat...\n");
mp_fprintf(n - 1, log10_radix, a, f_out);
fclose(f_out);
free(d3);
@@ -238,9 +308,9 @@
printf("floating point operation: %g op.\n", n_op);
fprintf(f_log, "floating point operation: %g op.\n", n_op);
/* ---- difftime ---- */
- d_time = difftime(t_2, t_1);
- printf("execution time: %g sec. (real time)\n", d_time);
- fprintf(f_log, "execution time: %g sec. (real time)\n", d_time);
+ d_time = t_2 - t_1;
+ printf("execution time: %.5g sec. (real time)\n", d_time);
+ fprintf(f_log, "execution time: %.5g sec. (real time)\n", d_time);
fclose(f_log);
return 0;
}
|
