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cf386262d5
Add unit tests for the functions for counting leading and trailing zero bits. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2025, Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
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*/
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#include <test/lib.h>
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#include <test/test.h>
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#include <test/ut.h>
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int __ctzsi2(int a);
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int __ctzdi2(long a);
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int __ctzti2(long long a);
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/**
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* test_ctz() - test library functions to count trailing zero bits
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*
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* @uts: unit test state
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*/
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static int test_ctz(struct unit_test_state *uts)
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{
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ut_asserteq(0, __ctzti2(0xffffffffffffffffLL));
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ut_asserteq(63, __ctzti2(0x8000000000000000LL));
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ut_asserteq(62, __ctzti2(0x4000000000000000LL));
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ut_asserteq(21, __ctzti2(0x0000500000a00000LL));
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ut_asserteq(1, __ctzti2(0x0000000000000002LL));
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ut_asserteq(0, __ctzti2(0x0000000000000001LL));
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#if BITS_PER_LONG == 64
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ut_asserteq(0, __ctzdi2(0xffffffffffffffffLL));
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ut_asserteq(63, __ctzdi2(0x8000000000000000LL));
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ut_asserteq(62, __ctzdi2(0x4000000000000000LL));
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ut_asserteq(21, __ctzdi2(0x0000500000a00000LL));
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ut_asserteq(1, __ctzdi2(0x0000000000000002LL));
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ut_asserteq(0, __ctzdi2(0x0000000000000001LL));
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#else
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ut_asserteq(0, __ctzdi2(0xffffffff));
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ut_asserteq(31, __ctzdi2(0x80000000));
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ut_asserteq(30, __ctzdi2(0x40000000));
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ut_asserteq(13, __ctzdi2(0x0050a000));
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ut_asserteq(1, __ctzdi2(0x00000002));
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ut_asserteq(0, __ctzdi2(0x00000001));
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#endif
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ut_asserteq(0, __ctzsi2(0xffffffff));
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ut_asserteq(31, __ctzsi2(0x80000000));
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ut_asserteq(30, __ctzsi2(0x40000000));
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ut_asserteq(13, __ctzsi2(0x0050a000));
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ut_asserteq(1, __ctzsi2(0x00000002));
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ut_asserteq(0, __ctzsi2(0x00000001));
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return 0;
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}
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LIB_TEST(test_ctz, 0);
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