xref: /freebsd/lib/libc/stdbit/stdc_count_zeros.c (revision 6296500a85c8474e3ff3fe2f8e4a9d56dd0acd64) 
1 /*
2  * Copyright (c) 2025 Robert Clausecker <fuz@FreeBSD.org>
3  *
4  * SPDX-License-Identifier: BSD-2-Clause
5  */
6 
7 #include <limits.h>
8 #include <stdbit.h>
9 
10 unsigned int
stdc_count_zeros_uc(unsigned char x)11 stdc_count_zeros_uc(unsigned char x)
12 {
13 	return (__builtin_popcount(x ^ UCHAR_MAX));
14 }
15 
16 unsigned int
stdc_count_zeros_us(unsigned short x)17 stdc_count_zeros_us(unsigned short x)
18 {
19 	return (__builtin_popcount(x ^ USHRT_MAX));
20 }
21 
22 unsigned int
stdc_count_zeros_ui(unsigned int x)23 stdc_count_zeros_ui(unsigned int x)
24 {
25 	return (__builtin_popcount(~x));
26 }
27 
28 unsigned int
stdc_count_zeros_ul(unsigned long x)29 stdc_count_zeros_ul(unsigned long x)
30 {
31 	return (__builtin_popcountl(~x));
32 }
33 
34 unsigned int
stdc_count_zeros_ull(unsigned long long x)35 stdc_count_zeros_ull(unsigned long long x)
36 {
37 	return (__builtin_popcountll(~x));
38 }
39