--- /dev/null
+#include <stdint.h>
+#include <stdio.h>
+#include "util.h"
+
+static struct ll_l t[] = {
+#if LDBL_MANT_DIG == 53
+#include "sanity/nexttoward.h"
+
+#elif LDBL_MANT_DIG == 64
+#include "sanity/nexttoward.h"
+
+#endif
+};
+
+int main(void)
+{
+ #pragma STDC FENV_ACCESS ON
+ long double y;
+ float d;
+ int e, i, err = 0;
+ struct ll_l *p;
+
+ for (i = 0; i < sizeof t/sizeof *t; i++) {
+ p = t + i;
+
+ if (p->r < 0)
+ continue;
+ fesetround(p->r);
+ feclearexcept(FE_ALL_EXCEPT);
+ y = nexttoward(p->x, p->x2);
+ e = fetestexcept(INEXACT|INVALID|DIVBYZERO|UNDERFLOW|OVERFLOW);
+
+ if (!checkexcept(e, p->e, p->r)) {
+ printf("%s:%d: bad fp exception: %s nexttoward(%La,%La)=%La, want %s",
+ p->file, p->line, rstr(p->r), p->x, p->x2, p->y, estr(p->e));
+ printf(" got %s\n", estr(e));
+ err++;
+ }
+ d = ulperrl(y, p->y, p->dy);
+ if (!checkulp(d, p->r)) {
+ printf("%s:%d: %s nexttoward(%La,%La) want %La got %La ulperr %.3f = %a + %a\n",
+ p->file, p->line, rstr(p->r), p->x, p->x2, p->y, y, d, d-p->dy, p->dy);
+ err++;
+ }
+ }
+ return !!err;
+}