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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
extern inline void libj2_ji_add_ji_to_j2i(intmax_t a, intmax_t b, struct libj2_j2i *res);
/* TODO Add man page */
#else
static intmax_t
random_ji(void)
{
size_t n = LIBJ2_JU_BIT - 1U;
intmax_t r = 0;
while (n--)
if (rand() < rand())
r |= (intmax_t)1 << n;
if (rand() < rand()) {
r = -r;
#if INTMAX_MIN + 1 == -INTMAX_MAX
r -= 1;
#endif
}
return r;
}
static void
get_expected(intmax_t a, intmax_t b, uintmax_t *expected_high, uintmax_t *expected_low)
{
uintmax_t pos, neg;
if (a >= 0 && b >= 0) {
*expected_high = 0;
*expected_low = (uintmax_t)a + (uintmax_t)b;
} else if (a <= 0 && b <= 0) {
*expected_high = UINTMAX_MAX;
*expected_low = (uintmax_t)a + (uintmax_t)b;
} else if (a < 0) {
pos = (uintmax_t)b;
neg = (uintmax_t)-(a + 1) + 1U;
goto pos_neg;
} else {
pos = (uintmax_t)a;
neg = (uintmax_t)-(b + 1) + 1U;
pos_neg:
if (pos >= neg)
*expected_high = 0;
else
*expected_high = UINTMAX_MAX;
*expected_low = pos - neg;
}
}
static void
check(intmax_t a, intmax_t b)
{
struct libj2_j2i r;
uintmax_t expected_high, expected_low;
get_expected(a, b, &expected_high, &expected_low);
r = (struct libj2_j2i){111, 222};
libj2_ji_add_ji_to_j2i(a, b, &r);
EXPECT(r.high == expected_high);
EXPECT(r.low == expected_low);
#if INTMAX_MIN + 1 == -INTMAX_MAX
if (a == INTMAX_MIN || b == INTMAX_MIN)
return;
#endif
r = (struct libj2_j2i){111, 222};
libj2_ji_add_ji_to_j2i(-a, -b, &r);
libj2_minus_j2i(&r);
EXPECT(r.high == expected_high);
EXPECT(r.low == expected_low);
}
static void
check_manual(intmax_t a, intmax_t b, uintmax_t expected_high, uintmax_t expected_low)
{
struct libj2_j2i r;
r = (struct libj2_j2i){111, 222};
libj2_ji_add_ji_to_j2i(a, b, &r);
EXPECT(r.high == expected_high);
EXPECT(r.low == expected_low);
#if INTMAX_MIN + 1 == -INTMAX_MAX
if (a == INTMAX_MIN || b == INTMAX_MIN)
goto check;
#endif
r = (struct libj2_j2i){111, 222};
libj2_ji_add_ji_to_j2i(-a, -b, &r);
libj2_minus_j2i(&r);
EXPECT(r.high == expected_high);
EXPECT(r.low == expected_low);
check:
check(a, b);
}
int
main(void)
{
unsigned i;
srand((unsigned)time(NULL));
check_manual(0, 0, 0, 0);
check_manual(0, INTMAX_MAX, 0, (uintmax_t)INTMAX_MAX);
check_manual(INTMAX_MAX, 0, 0, (uintmax_t)INTMAX_MAX);
check_manual(INTMAX_MAX, 1, 0, UINTMAX_MAX ^ (UINTMAX_MAX >> 1));
check_manual(1, INTMAX_MAX, 0, UINTMAX_MAX ^ (UINTMAX_MAX >> 1));
check_manual(INTMAX_MAX, INTMAX_MAX, 0, (uintmax_t)INTMAX_MAX << 1);
check_manual(0, -INTMAX_MAX, UINTMAX_MAX, (UINTMAX_MAX ^ (UINTMAX_MAX >> 1)) + 1U);
check_manual(-INTMAX_MAX, 0, UINTMAX_MAX, (UINTMAX_MAX ^ (UINTMAX_MAX >> 1)) + 1U);
check_manual(INTMAX_MAX, -1, 0, (uintmax_t)INTMAX_MAX - 1U);
check_manual(-1, INTMAX_MAX, 0, (uintmax_t)INTMAX_MAX - 1U);
check_manual(-INTMAX_MAX, 1, UINTMAX_MAX, (UINTMAX_MAX ^ (UINTMAX_MAX >> 1)) + 2U);
check_manual(1, -INTMAX_MAX, UINTMAX_MAX, (UINTMAX_MAX ^ (UINTMAX_MAX >> 1)) + 2U);
check_manual(INTMAX_MAX, -INTMAX_MAX, 0, 0);
#if INTMAX_MIN + 1 == -INTMAX_MAX
check_manual(0, INTMAX_MIN, UINTMAX_MAX, UINTMAX_MAX ^ (UINTMAX_MAX >> 1));
check_manual(INTMAX_MIN, 0, UINTMAX_MAX, UINTMAX_MAX ^ (UINTMAX_MAX >> 1));
check_manual(INTMAX_MIN, 1, UINTMAX_MAX, (UINTMAX_MAX ^ (UINTMAX_MAX >> 1)) + 1U);
check_manual(1, INTMAX_MIN, UINTMAX_MAX, (UINTMAX_MAX ^ (UINTMAX_MAX >> 1)) + 1U);
check_manual(INTMAX_MIN, INTMAX_MAX, UINTMAX_MAX, UINTMAX_MAX);
check_manual(INTMAX_MIN, -INTMAX_MAX, UINTMAX_MAX, 1);
check_manual(INTMAX_MIN, INTMAX_MIN, UINTMAX_MAX, 0);
#endif
for (i = 0; i < 256; i++) {
check(0, random_ji());
check(1, random_ji());
check(random_ji(), 0);
check(random_ji(), 1);
check(random_ji(), random_ji());
check(random_ji(), INTMAX_MAX);
check(INTMAX_MAX, random_ji());
}
return 0;
}
#endif
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