blob: e0841ec57af279b9b943ccdeb07519021379347f [file] [log] [blame]
/*
* Copyright 2016 The Emscripten Authors. All rights reserved.
* Emscripten is available under two separate licenses, the MIT license and the
* University of Illinois/NCSA Open Source License. Both these licenses can be
* found in the LICENSE file.
*/
#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;
}