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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
extern inline void libj2_j2u_sub_ju(struct libj2_j2u *a, uintmax_t b);
/* 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
check(uintmax_t a_high, uintmax_t a_low, uintmax_t b)
{
struct libj2_j2u a, r, expected;
int expected_overflow, expected_roverflow;
a = (struct libj2_j2u){.high = a_high, .low = a_low};
expected_overflow = libj2_j2u_lt_ju(&a, b);
expected_roverflow = libj2_ju_lt_j2u(b, &a);
libj2_ju_to_j2u(b, &expected);
libj2_minus_j2u(&expected);
libj2_j2u_add_j2u_overflow(&expected, &a);
a = (struct libj2_j2u){.high = a_high, .low = a_low};
libj2_j2u_sub_ju(&a, b);
EXPECT(libj2_j2u_eq_j2u(&a, &expected));
a = (struct libj2_j2u){.high = a_high, .low = a_low};
EXPECT(libj2_j2u_sub_ju_overflow(&a, b) == expected_overflow);
EXPECT(libj2_j2u_eq_j2u(&a, &expected));
r = (struct libj2_j2u){111, 222};
a = (struct libj2_j2u){.high = a_high, .low = a_low};
libj2_j2u_sub_ju_to_j2u(&a, b, &r);
EXPECT(a.high == a_high);
EXPECT(a.low == a_low);
EXPECT(libj2_j2u_eq_j2u(&r, &expected));
a = (struct libj2_j2u){.high = a_high, .low = a_low};
libj2_j2u_sub_ju_to_j2u(&a, b, &a);
EXPECT(libj2_j2u_eq_j2u(&a, &expected));
r = (struct libj2_j2u){111, 222};
a = (struct libj2_j2u){.high = a_high, .low = a_low};
EXPECT(libj2_j2u_sub_ju_to_j2u_overflow(&a, b, &r) == expected_overflow);
EXPECT(a.high == a_high);
EXPECT(a.low == a_low);
EXPECT(libj2_j2u_eq_j2u(&r, &expected));
a = (struct libj2_j2u){.high = a_high, .low = a_low};
EXPECT(libj2_j2u_sub_ju_to_j2u_overflow(&a, b, &a) == expected_overflow);
EXPECT(libj2_j2u_eq_j2u(&a, &expected));
r = (struct libj2_j2u){111, 222};
a = (struct libj2_j2u){.high = a_high, .low = a_low};
libj2_ju_sub_j2u_to_j2u(b, &a, &r);
EXPECT(a.high == a_high);
EXPECT(a.low == a_low);
libj2_minus_j2u(&r);
EXPECT(libj2_j2u_eq_j2u(&r, &expected));
a = (struct libj2_j2u){.high = a_high, .low = a_low};
libj2_ju_sub_j2u_to_j2u(b, &a, &a);
libj2_minus_j2u(&a);
EXPECT(libj2_j2u_eq_j2u(&a, &expected));
a = (struct libj2_j2u){.high = a_high, .low = a_low};
libj2_j2u_rsub_ju(&a, b);
libj2_minus_j2u(&a);
EXPECT(libj2_j2u_eq_j2u(&a, &expected));
a = (struct libj2_j2u){.high = a_high, .low = a_low};
EXPECT(libj2_j2u_rsub_ju_overflow(&a, b) == expected_roverflow);
libj2_minus_j2u(&a);
EXPECT(libj2_j2u_eq_j2u(&a, &expected));
r = (struct libj2_j2u){111, 222};
a = (struct libj2_j2u){.high = a_high, .low = a_low};
EXPECT(libj2_ju_sub_j2u_to_j2u_overflow(b, &a, &r) == expected_roverflow);
EXPECT(a.high == a_high);
EXPECT(a.low == a_low);
libj2_minus_j2u(&r);
EXPECT(libj2_j2u_eq_j2u(&r, &expected));
a = (struct libj2_j2u){.high = a_high, .low = a_low};
EXPECT(libj2_ju_sub_j2u_to_j2u_overflow(b, &a, &a) == expected_roverflow);
libj2_minus_j2u(&a);
EXPECT(libj2_j2u_eq_j2u(&a, &expected));
}
int
main(void)
{
unsigned i;
srand((unsigned)time(NULL));
check(0, 0, 0);
check(0, 0, UINTMAX_MAX);
check(UINTMAX_MAX, 0, 0);
check(UINTMAX_MAX, 0, UINTMAX_MAX);
for (i = 0; i < 256; i++) {
check(0, 0, random_ju());
check(random_ju(), 0, 0);
check(random_ju(), 0, random_ju());
check(random_ju(), 0, UINTMAX_MAX);
check(UINTMAX_MAX, 0, random_ju());
}
check(0, UINTMAX_MAX, 0);
check(0, UINTMAX_MAX, UINTMAX_MAX);
check(UINTMAX_MAX, UINTMAX_MAX, 0);
check(UINTMAX_MAX, UINTMAX_MAX, UINTMAX_MAX);
for (i = 0; i < 256; i++) {
check(0, UINTMAX_MAX, random_ju());
check(random_ju(), UINTMAX_MAX, 0);
check(random_ju(), UINTMAX_MAX, 1);
check(random_ju(), UINTMAX_MAX, random_ju());
check(random_ju(), UINTMAX_MAX, UINTMAX_MAX);
check(UINTMAX_MAX, UINTMAX_MAX, random_ju());
}
for (i = 0; i < 256; i++)
check(random_ju(), random_ju(), random_ju());
return 0;
}
#endif
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