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
|
/* Fun with builtins */
#include <stdio.h>
#include <math.h>
char * check_relative_error(double exact, double actual, double precision)
{
double relative_error = (actual - exact) / exact;
return fabs(relative_error) <= precision ? "OK" : "ERROR";
}
//unsigned int x = 0x12345678;
//unsigned int y = 0xDEADBEEF;
//unsigned long long xx = 0x1234567812345678ULL;
//double a = 3.14159;
//double b = 2.718;
//double c = 1.414;
//unsigned short s = 0x1234;
int main(int argc, char ** argv)
{
unsigned z;
//printf("mulhw(%x, %x) = %x\n", x, y, __builtin_mulhw(x, y));
//printf("mulhwu(%x, %x) = %x\n", x, y, __builtin_mulhwu(x, y));
//printf("clz(%x) = %d\n", x, __builtin_clz(x));
//printf("clzll(%llx) = %d\n", (unsigned long long) x, __builtin_clzll(x));
//printf("clzll(%llx) = %d\n", xx, __builtin_clzll(xx));
//z = __builtin_bswap(x);
//printf("clzll(%lx) = %d\n", z, __builtin_clzll(z));
//printf("bswap(%x) = %x\n", x, __builtin_bswap(x));
//printf("bswap16(%x) = %x\n", s, __builtin_bswap16(s));
//printf("fmadd(%f, %f, %f) = %f\n", a, b, c, __builtin_fmadd(a, b, c));
//printf("fmsub(%f, %f, %f) = %f\n", a, b, c, __builtin_fmsub(a, b, c));
//printf("fabs(%f) = %f\n", a, __builtin_fabs(a));
//printf("fabs(%f) = %f\n", -a, __builtin_fabs(-a));
//printf("fsqrt(%f) = %f\n", a, __builtin_fsqrt(a));
//printf("frsqrte(%f) = %s\n",
// a, check_relative_error(1.0 / sqrt(a), __builtin_frsqrte(a), 1./32.));
//printf("fres(%f) = %s\n",
// a, check_relative_error(1.0 / a, __builtin_fres(a), 1./256.));
//printf("fsel(%f, %f, %f) = %f\n", a, b, c, __builtin_fsel(a, b, c));
//printf("fsel(%f, %f, %f) = %f\n", -a, b, c, __builtin_fsel(-a, b, c));
//printf("fcti(%f) = %d\n", a, __builtin_fcti(a));
//printf("fcti(%f) = %d\n", b, __builtin_fcti(b));
//printf("fcti(%f) = %d\n", c, __builtin_fcti(c));
//__builtin_eieio();
//__builtin_sync();
//__builtin_isync();
//printf("isel(%d, %d, %d) = %d\n", 0, x, y, __builtin_isel(0, x, y));
//printf("isel(%d, %d, %d) = %d\n", 42, x, y, __builtin_isel(42, x, y));
//printf ("read_16_rev = %x\n", __builtin_read16_reversed(&s));
//printf ("read_32_rev = %x\n", __builtin_read32_reversed(&y));
//__builtin_write16_reversed(&s, 0x789A);
//printf ("after write_16_rev: %x\n", s);
//__builtin_write32_reversed(&y, 0x12345678);
//printf ("after write_32_rev: %x\n", y);
//y = 0;
//__builtin_write32_reversed(&y, 0x12345678);
//printf ("CSE write_32_rev: %s\n", y == 0x78563412 ? "ok" : "ERROR");
///* Make sure that ignoring the result of a builtin
// doesn't cause an internal error */
//(void) __builtin_bswap(x);
//(void) __builtin_fsqrt(a);
return 0;
}
|
