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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2025, Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
*/
#include <test/lib.h>
#include <test/test.h>
#include <test/ut.h>
int __ctzsi2(int a);
int __ctzdi2(long a);
int __ctzti2(long long a);
/**
* test_ctz() - test library functions to count trailing zero bits
*
* @uts: unit test state
*/
static int test_ctz(struct unit_test_state *uts)
{
ut_asserteq(0, __ctzti2(0xffffffffffffffffLL));
ut_asserteq(63, __ctzti2(0x8000000000000000LL));
ut_asserteq(62, __ctzti2(0x4000000000000000LL));
ut_asserteq(21, __ctzti2(0x0000500000a00000LL));
ut_asserteq(1, __ctzti2(0x0000000000000002LL));
ut_asserteq(0, __ctzti2(0x0000000000000001LL));
#if BITS_PER_LONG == 64
ut_asserteq(0, __ctzdi2(0xffffffffffffffffLL));
ut_asserteq(63, __ctzdi2(0x8000000000000000LL));
ut_asserteq(62, __ctzdi2(0x4000000000000000LL));
ut_asserteq(21, __ctzdi2(0x0000500000a00000LL));
ut_asserteq(1, __ctzdi2(0x0000000000000002LL));
ut_asserteq(0, __ctzdi2(0x0000000000000001LL));
#else
ut_asserteq(0, __ctzdi2(0xffffffff));
ut_asserteq(31, __ctzdi2(0x80000000));
ut_asserteq(30, __ctzdi2(0x40000000));
ut_asserteq(13, __ctzdi2(0x0050a000));
ut_asserteq(1, __ctzdi2(0x00000002));
ut_asserteq(0, __ctzdi2(0x00000001));
#endif
ut_asserteq(0, __ctzsi2(0xffffffff));
ut_asserteq(31, __ctzsi2(0x80000000));
ut_asserteq(30, __ctzsi2(0x40000000));
ut_asserteq(13, __ctzsi2(0x0050a000));
ut_asserteq(1, __ctzsi2(0x00000002));
ut_asserteq(0, __ctzsi2(0x00000001));
return 0;
}
LIB_TEST(test_ctz, 0);
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