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/* Test pseudo-denormal operations. */
#include <stdint.h>
#include <stdio.h>
union u {
struct { uint64_t sig; uint16_t sign_exp; } s;
long double ld;
};
volatile union u ld_pseudo_m16382 = { .s = { UINT64_C(1) << 63, 0 } };
volatile long double ld_res;
int main(void)
{
short cw;
int ret = 0;
ld_res = ld_pseudo_m16382.ld + ld_pseudo_m16382.ld;
if (ld_res != 0x1p-16381L) {
printf("FAIL: pseudo-denormal add\n");
ret = 1;
}
if (ld_pseudo_m16382.ld != 0x1p-16382L) {
printf("FAIL: pseudo-denormal compare\n");
ret = 1;
}
/* Set round-upward. */
__asm__ volatile ("fnstcw %0" : "=m" (cw));
cw = (cw & ~0xc00) | 0x800;
__asm__ volatile ("fldcw %0" : : "m" (cw));
__asm__ ("frndint" : "=t" (ld_res) : "0" (ld_pseudo_m16382.ld));
if (ld_res != 1.0L) {
printf("FAIL: pseudo-denormal round-to-integer\n");
ret = 1;
}
return ret;
}
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