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275c11b7cc
This new header complies with ISO/IEC 9899:2024 (C23). Contrary to glibc, we do not provide inline definitions in <stdbit.h> as we expect our system compiler to soon recognise these as builtins anyway. Relnotes: yes MFC after: 1 month Reviewed by: adrian Approved by: markj (mentor) Differential Revision: https://reviews.freebsd.org/D53657 (cherry picked from commit 6296500a85c8474e3ff3fe2f8e4a9d56dd0acd64)
53 lines
804 B
C
53 lines
804 B
C
/*
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* Copyright (c) 2025 Robert Clausecker <fuz@FreeBSD.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <limits.h>
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#include <stdbit.h>
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unsigned int
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stdc_first_trailing_zero_uc(unsigned char x)
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{
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if (x == UCHAR_MAX)
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return (0);
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return (__builtin_ctz(~x) + 1);
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}
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unsigned int
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stdc_first_trailing_zero_us(unsigned short x)
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{
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if (x == USHRT_MAX)
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return (0);
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return (__builtin_ctz(~x) + 1);
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}
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unsigned int
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stdc_first_trailing_zero_ui(unsigned int x)
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{
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if (x == ~0U)
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return (0);
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return (__builtin_ctz(~x) + 1);
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}
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unsigned int
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stdc_first_trailing_zero_ul(unsigned long x)
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{
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if (x == ~0UL)
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return (0);
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return (__builtin_ctzl(~x) + 1);
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}
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unsigned int
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stdc_first_trailing_zero_ull(unsigned long long x)
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{
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if (x == ~0ULL)
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return (0);
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return (__builtin_ctzll(~x) + 1);
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}
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