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
|
/* Fun with builtin functions */
#include <stdio.h>
int main(int argc, char ** argv)
{
unsigned int x = 0x12345678;
unsigned int y = 0xDEADBEEF;
unsigned long long xx = 0x1234567812345678ULL;
unsigned long long yy = 0x1234567800000000ULL;
unsigned long long zz = 0x123456789ABCDEF0ULL;
unsigned z;
double a = 3.14159;
double b = 2.718;
double c = 1.414;
unsigned short s = 0x1234;
printf("bswap(%x) = %x\n", x, __builtin_bswap(x));
printf("bswap16(%x) = %x\n", s, __builtin_bswap16(s));
printf("bswap64(%llx) = %llx\n", zz, __builtin_bswap64(zz));
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("ctz(%x) = %d\n", s, __builtin_ctz(s));
printf("ctzll(%llx) = %d\n", xx, __builtin_ctzll(xx));
printf("ctzll(%llx) = %d\n", yy, __builtin_ctzll(yy));
printf("ctzll(%lx) = %d\n", z, __builtin_ctzll(z));
printf("fsqrt(%f) = %f\n", a, __builtin_fsqrt(a));
printf("fmin(%f, %f) = %f\n", a, b, __builtin_fmin(a, b));
printf("fmax(%f, %f) = %f\n", a, b, __builtin_fmax(a, b));
#ifdef FMA3
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("fnmadd(%f, %f, %f) = %f\n", a, b, c, __builtin_fnmadd(a, b, c));
printf("fnmsub(%f, %f, %f) = %f\n", a, b, c, __builtin_fnmsub(a, b, c));
#endif
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;
}
|
