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https://github.com/fluencelabs/wasmer
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42 lines
1016 B
C
42 lines
1016 B
C
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/*
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* Copyright 2016 The Emscripten Authors. All rights reserved.
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* Emscripten is available under two separate licenses, the MIT license and the
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* University of Illinois/NCSA Open Source License. Both these licenses can be
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* found in the LICENSE file.
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*/
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#include <stdio.h>
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typedef long long int64;
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#define JSDOUBLE_HI32_SIGNBIT 0x80000000
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bool JSDOUBLE_IS_NEGZERO(double d) {
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union {
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struct {
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unsigned int lo, hi;
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} s;
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double d;
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} x;
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if (d != 0) return false;
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x.d = d;
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return (x.s.hi & JSDOUBLE_HI32_SIGNBIT) != 0;
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}
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bool JSINT64_IS_NEGZERO(int64 l) {
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union {
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int64 i;
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double d;
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} x;
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if (l != 0) return false;
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x.i = l;
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return x.d == -0;
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}
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int main(int argc, char* argv[]) {
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printf("*%d,%d,%d,%d*\n", JSDOUBLE_IS_NEGZERO(0), JSDOUBLE_IS_NEGZERO(-0),
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JSDOUBLE_IS_NEGZERO(-1), JSDOUBLE_IS_NEGZERO(+1));
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printf("*%d,%d,%d,%d*\n", JSINT64_IS_NEGZERO(0), JSINT64_IS_NEGZERO(-0),
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JSINT64_IS_NEGZERO(-1), JSINT64_IS_NEGZERO(+1));
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return 0;
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}
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