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31 lines
593 B
31 lines
593 B
#include <stdio.h>
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#define PRINT() do { \
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printf("%lf -> %02x %02x %02x %02x %02x %02x %02x %02x\n", \
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u.d, \
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(unsigned int) u.x[0], \
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(unsigned int) u.x[1], \
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(unsigned int) u.x[2], \
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(unsigned int) u.x[3], \
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(unsigned int) u.x[4], \
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(unsigned int) u.x[5], \
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(unsigned int) u.x[6], \
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(unsigned int) u.x[7]); \
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} while (0)
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int main(int argc, char *argv[]) {
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volatile union {
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double d;
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unsigned char x[8];
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} u;
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u.d = 0.0;
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PRINT();
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/* In TCC, with default options, this operation does not change the
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* output. In GCC it does.
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*/
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u.d = -u.d;
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PRINT();
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}
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