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/* Test conversions of signaling NaNs to and from long double. */
#include <stdint.h>
#include <stdio.h>
volatile float f_res;
volatile double d_res;
volatile long double ld_res;
volatile float f_snan = __builtin_nansf("");
volatile double d_snan = __builtin_nans("");
volatile long double ld_snan = __builtin_nansl("");
int issignaling_f(float x)
{
union { float f; uint32_t u; } u = { .f = x };
return (u.u & 0x7fffffff) > 0x7f800000 && (u.u & 0x400000) == 0;
}
int issignaling_d(double x)
{
union { double d; uint64_t u; } u = { .d = x };
return (((u.u & UINT64_C(0x7fffffffffffffff)) >
UINT64_C(0x7ff0000000000000)) &&
(u.u & UINT64_C(0x8000000000000)) == 0);
}
int issignaling_ld(long double x)
{
union {
long double ld;
struct { uint64_t sig; uint16_t sign_exp; } s;
} u = { .ld = x };
return ((u.s.sign_exp & 0x7fff) == 0x7fff &&
(u.s.sig >> 63) != 0 &&
(u.s.sig & UINT64_C(0x4000000000000000)) == 0);
}
int main(void)
{
int ret = 0;
ld_res = f_snan;
if (issignaling_ld(ld_res)) {
printf("FAIL: float -> long double\n");
ret = 1;
}
ld_res = d_snan;
if (issignaling_ld(ld_res)) {
printf("FAIL: double -> long double\n");
ret = 1;
}
f_res = ld_snan;
if (issignaling_d(f_res)) {
printf("FAIL: long double -> float\n");
ret = 1;
}
d_res = ld_snan;
if (issignaling_d(d_res)) {
printf("FAIL: long double -> double\n");
ret = 1;
}
return ret;
}
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