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
|
#include <stdio.h>
typedef long long int64;
#define JSDOUBLE_HI32_SIGNBIT 0x80000000
bool JSDOUBLE_IS_NEGZERO(double d)
{
union {
struct {
unsigned int lo, hi;
} s;
double d;
} x;
if (d != 0)
return false;
x.d = d;
return (x.s.hi & JSDOUBLE_HI32_SIGNBIT) != 0;
}
bool JSINT64_IS_NEGZERO(int64 l)
{
union {
int64 i;
double d;
} x;
if (l != 0)
return false;
x.i = l;
return x.d == -0;
}
int main(int argc, char * argv[]) {
printf("*%d,%d,%d,%d*\n", JSDOUBLE_IS_NEGZERO(0), JSDOUBLE_IS_NEGZERO(-0), JSDOUBLE_IS_NEGZERO(-1), JSDOUBLE_IS_NEGZERO(+1));
printf("*%d,%d,%d,%d*\n", JSINT64_IS_NEGZERO(0), JSINT64_IS_NEGZERO(-0), JSINT64_IS_NEGZERO(-1), JSINT64_IS_NEGZERO(+1));
return 0;
}
|
