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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2025, Heinrich Schuchardt <[email protected]>
*/
#include <test/lib.h>
#include <test/test.h>
#include <test/ut.h>
int __clzsi2(int a);
int __clzdi2(long a);
int __clzti2(long long a);
/**
* test_clz() - test library functions to count leading zero bits
*
* @uts: unit test state
*/
static int test_clz(struct unit_test_state *uts)
{
ut_asserteq(0, __clzti2(0xffffffffffffffffLL));
ut_asserteq(0, __clzti2(0x8000000000000000LL));
ut_asserteq(1, __clzti2(0x4000000000000000LL));
ut_asserteq(17, __clzti2(0x0000500000a00000LL));
ut_asserteq(62, __clzti2(0x0000000000000002LL));
ut_asserteq(63, __clzti2(0x0000000000000001LL));
#if BITS_PER_LONG == 64
ut_asserteq(0, __clzdi2(0xffffffffffffffffLL));
ut_asserteq(0, __clzti2(0x8000000000000000LL));
ut_asserteq(1, __clzti2(0x4000000000000000LL));
ut_asserteq(17, __clzdi2(0x0000500000a00000LL));
ut_asserteq(62, __clzdi2(0x0000000000000002LL));
ut_asserteq(63, __clzdi2(0x0000000000000001LL));
#else
ut_asserteq(0, __clzdi2(0xffffffff));
ut_asserteq(0, __clzdi2(0x80000000));
ut_asserteq(1, __clzdi2(0x40000000));
ut_asserteq(9, __clzdi2(0x0050a000));
ut_asserteq(30, __clzdi2(0x00000002));
ut_asserteq(31, __clzdi2(0x00000001));
#endif
ut_asserteq(0, __clzsi2(0xffffffff));
ut_asserteq(0, __clzsi2(0x80000000));
ut_asserteq(1, __clzsi2(0x40000000));
ut_asserteq(9, __clzsi2(0x0050a000));
ut_asserteq(30, __clzsi2(0x00000002));
ut_asserteq(31, __clzsi2(0x00000001));
return 0;
}
LIB_TEST(test_clz, 0);
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