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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
extern inline void libj2_minus_j2u(struct libj2_j2u *a);
/* TODO Add man page */
#else
static uintmax_t
random_ju(void)
{
size_t n = LIBJ2_JU_BIT;
uintmax_t r = 0;
while (n--)
if (rand() < rand())
r |= (uintmax_t)1 << n;
return r;
}
static void
minus_j2u(struct libj2_j2u *a)
{
struct libj2_j2u r, a_saved = *a;
r = (struct libj2_j2u){111, 222};
libj2_minus_j2u_to_j2u(a, &r);
EXPECT(libj2_j2u_eq_j2u(a, &a_saved));
libj2_minus_j2u(a);
EXPECT(libj2_j2u_eq_j2u(a, &r));
}
int
main(void)
{
unsigned i;
struct libj2_j2u a, b;
uintmax_t v;
libj2_j2u_zero(&a);
minus_j2u(&a);
EXPECT(libj2_j2u_is_zero(&a));
a = (struct libj2_j2u){.high = 0, .low = 1};
minus_j2u(&a);
EXPECT(libj2_j2u_eq_j2u(&a, &(struct libj2_j2u){.high = UINTMAX_MAX, .low = UINTMAX_MAX}));
a = (struct libj2_j2u){.high = UINTMAX_MAX, .low = UINTMAX_MAX};
minus_j2u(&a);
EXPECT(libj2_j2u_eq_j2u(&a, &(struct libj2_j2u){.high = 0, .low = 1}));
for (i = 0; i < 256; i++) {
a.high = 0;
a.low = v = random_ju();
minus_j2u(&a);
EXPECT(a.high == UINTMAX_MAX);
EXPECT(a.low == 0U - v);
a.high = UINTMAX_MAX;
a.low = v = random_ju();
minus_j2u(&a);
EXPECT(a.high == 0);
EXPECT(a.low == 0U - v);
}
for (i = 0; i < 256; i++) {
a.high = b.high = random_ju() >> 1;
a.low = b.low = random_ju();
minus_j2u(&a);
libj2_j2u_add_j2u(&a, &b);
EXPECT(libj2_j2u_is_zero(&a));
a.high = b.high ^= UINTMAX_MAX;
a.low = b.low ^= UINTMAX_MAX;
minus_j2u(&a);
libj2_j2u_add_j2u(&a, &b);
EXPECT(libj2_j2u_is_zero(&a));
}
return 0;
}
#endif
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