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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
extern inline void libj2_ju_mul_ju_to_j2u(uintmax_t a, uintmax_t b, struct libj2_j2u *res);
/* TODO Add man page */
#else
static uintmax_t
random_small_ju(size_t bits)
{
uintmax_t r = 0;
while (bits--)
if (rand() < rand())
r |= (uintmax_t)1 << bits;
return r;
}
static uintmax_t
random_hju(void)
{
return random_small_ju(LIBJ2_JU_BIT / 2U);
}
static uintmax_t
random_ju(void)
{
return random_small_ju(LIBJ2_JU_BIT);
}
static void
mul(uintmax_t a, uintmax_t b, struct libj2_j2u *expected)
{
struct libj2_j2u c;
unsigned i;
libj2_j2u_zero(expected);
for (i = 0; i < LIBJ2_JU_BIT; i++, b >>= 1) {
if (b & 1U) {
libj2_ju_lsh_to_j2u(a, i, &c);
libj2_j2u_add_j2u(expected, &c);
}
}
}
int
main(void)
{
struct libj2_j2u r, expected;
uintmax_t u, v;
unsigned i;
srand((unsigned)time(NULL));
r = (struct libj2_j2u){111, 222};
libj2_ju_mul_ju_to_j2u(0, 0, &r);
EXPECT(libj2_j2u_is_zero(&r));
r = (struct libj2_j2u){111, 222};
libj2_ju_mul_ju_to_j2u(0, 1, &r);
EXPECT(libj2_j2u_is_zero(&r));
r = (struct libj2_j2u){111, 222};
libj2_ju_mul_ju_to_j2u(0, UINTMAX_MAX, &r);
EXPECT(libj2_j2u_is_zero(&r));
r = (struct libj2_j2u){111, 222};
libj2_ju_mul_ju_to_j2u(1, 0, &r);
EXPECT(libj2_j2u_is_zero(&r));
r = (struct libj2_j2u){111, 222};
libj2_ju_mul_ju_to_j2u(UINTMAX_MAX, 0, &r);
EXPECT(libj2_j2u_is_zero(&r));
for (i = 0; i < 32; i++) {
r = (struct libj2_j2u){111, 222};
libj2_ju_mul_ju_to_j2u(0, random_ju(), &r);
EXPECT(libj2_j2u_is_zero(&r));
r = (struct libj2_j2u){111, 222};
libj2_ju_mul_ju_to_j2u(random_ju(), 0, &r);
EXPECT(libj2_j2u_is_zero(&r));
}
r = (struct libj2_j2u){111, 222};
libj2_ju_mul_ju_to_j2u(1, 1, &r);
EXPECT(r.high == 0);
EXPECT(r.low == 1);
r = (struct libj2_j2u){111, 222};
libj2_ju_mul_ju_to_j2u(4, 4, &r);
EXPECT(r.high == 0);
EXPECT(r.low == 16);
for (i = 0; i < 32; i++) {
r = (struct libj2_j2u){111, 222};
v = random_ju();
libj2_ju_mul_ju_to_j2u(1, v, &r);
EXPECT(r.high == 0);
EXPECT(r.low == v);
r = (struct libj2_j2u){111, 222};
v = random_ju();
libj2_ju_mul_ju_to_j2u(v, 1, &r);
EXPECT(r.high == 0);
EXPECT(r.low == v);
}
for (i = 0; i < 32; i++) {
u = random_hju();
v = random_hju();
r = (struct libj2_j2u){111, 222};
libj2_ju_mul_ju_to_j2u(u, v, &r);
EXPECT(r.high == 0);
EXPECT(r.low == u * v);
libj2_ju_mul_ju_to_j2u(v, u, &r);
EXPECT(r.high == 0);
EXPECT(r.low == u * v);
}
r = (struct libj2_j2u){111, 222};
libj2_ju_mul_ju_to_j2u(UINTMAX_MAX, UINTMAX_MAX, &r);
EXPECT(r.high == UINTMAX_MAX - 1U);
EXPECT(r.low == 1);
for (i = 0; i < 256; i++) {
u = random_ju();
v = random_ju();
mul(u, v, &expected);
r = (struct libj2_j2u){111, 222};
libj2_ju_mul_ju_to_j2u(u, v, &r);
EXPECT(libj2_j2u_eq_j2u(&r, &expected));
libj2_ju_mul_ju_to_j2u(v, u, &r);
EXPECT(libj2_j2u_eq_j2u(&r, &expected));
}
return 0;
}
#endif
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