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#include <stdint.h>
#include <math.h>
#include <stdio.h>
extern int64_t float_to_int(double);
extern int64_t float_to_u8(double);
int main(void) {
double values[] = {0.0,-0.0,6.92,-6.92,0.99,-0.99,255.75,-257.75,
0x1p63,0x1.fffffffffffffp62,-0x1p63,-0x1.0000000000001p63,
INFINITY,-INFINITY,NAN,-NAN};
for( unsigned i=0; i<sizeof(values)/sizeof(values[0]); i++ ) {
double x=values[i];
int64_t expected=isnan(x) ? 0 : x>=0x1p63 ? INT64_MAX
: x<=-0x1p63 ? INT64_MIN : (int64_t)x;
int64_t actual=float_to_int(x), narrow=float_to_u8(x);
if( actual!=expected || narrow!=(expected&255) ) {
fprintf(stderr,"conversion of %g: got %lld / %lld, expected %lld / %lld\n",
x,(long long)actual,(long long)narrow,
(long long)expected,(long long)(expected&255));
return 1;
}
}
return 0;
}
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