xref: /freebsd/lib/libc/tests/stdbit/stdc_first_leading_zero_test.c (revision 2fb8cbc6ef1b3cc6cd60e5db07f8305623f9b044) 
1*2fb8cbc6SRobert Clausecker /*
2*2fb8cbc6SRobert Clausecker  * Copyright (c) 2025 Robert Clausecker <fuz@FreeBSD.org>
3*2fb8cbc6SRobert Clausecker  *
4*2fb8cbc6SRobert Clausecker  * SPDX-License-Identifier: BSD-2-Clause
5*2fb8cbc6SRobert Clausecker  */
6*2fb8cbc6SRobert Clausecker 
7*2fb8cbc6SRobert Clausecker #define FUNCSTEM stdc_first_leading_zero
8*2fb8cbc6SRobert Clausecker #define MKREFFUNC(name, type)						\
9*2fb8cbc6SRobert Clausecker 	static unsigned							\
10*2fb8cbc6SRobert Clausecker 	name(type value) 						\
11*2fb8cbc6SRobert Clausecker 	{ 								\
12*2fb8cbc6SRobert Clausecker 		type bit = 1;						\
13*2fb8cbc6SRobert Clausecker 		unsigned pos = 1;					\
14*2fb8cbc6SRobert Clausecker 									\
15*2fb8cbc6SRobert Clausecker 		value = ~value;						\
16*2fb8cbc6SRobert Clausecker 		if (value == 0)						\
17*2fb8cbc6SRobert Clausecker 			return (0);					\
18*2fb8cbc6SRobert Clausecker 									\
19*2fb8cbc6SRobert Clausecker 		while ((type)(bit << 1) != 0)				\
20*2fb8cbc6SRobert Clausecker 			bit <<= 1;					\
21*2fb8cbc6SRobert Clausecker 									\
22*2fb8cbc6SRobert Clausecker 		while ((bit & value) == 0) {				\
23*2fb8cbc6SRobert Clausecker 			bit >>= 1;					\
24*2fb8cbc6SRobert Clausecker 			pos++;						\
25*2fb8cbc6SRobert Clausecker 		}							\
26*2fb8cbc6SRobert Clausecker 									\
27*2fb8cbc6SRobert Clausecker 		return (pos);						\
28*2fb8cbc6SRobert Clausecker 	}
29*2fb8cbc6SRobert Clausecker 
30*2fb8cbc6SRobert Clausecker #include "stdbit-test-framework.c"
31