xref: /freebsd/sys/contrib/ck/include/gcc/ck_cc.h (revision 63d1fd5970ec814904aa0f4580b10a0d302d08b2)
1 /*
2  * Copyright 2009-2015 Samy Al Bahra.
3  * Copyright 2014 Paul Khuong.
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  */
27 
28 #ifndef CK_GCC_CC_H
29 #define CK_GCC_CC_H
30 
31 #include <ck_md.h>
32 
33 #ifdef __SUNPRO_C
34 #define CK_CC_UNUSED
35 #define CK_CC_USED
36 #define CK_CC_IMM
37 #define CK_CC_IMM_U32
38 #else
39 #define CK_CC_UNUSED __attribute__((unused))
40 #define CK_CC_USED   __attribute__((used))
41 #define CK_CC_IMM "i"
42 #if defined(__x86_64__) || defined(__x86__)
43 #define CK_CC_IMM_U32 "Z"
44 #define CK_CC_IMM_S32 "e"
45 #else
46 #define CK_CC_IMM_U32 CK_CC_IMM
47 #define CK_CC_IMM_S32 CK_CC_IMM
48 #endif /* __x86_64__ || __x86__ */
49 #endif
50 
51 #ifdef __OPTIMIZE__
52 #define CK_CC_INLINE CK_CC_UNUSED inline
53 #else
54 #define CK_CC_INLINE CK_CC_UNUSED
55 #endif
56 
57 #define CK_CC_FORCE_INLINE CK_CC_UNUSED __attribute__((always_inline)) inline
58 #define CK_CC_RESTRICT __restrict__
59 
60 /*
61  * Packed attribute.
62  */
63 #define CK_CC_PACKED __attribute__((packed))
64 
65 /*
66  * Weak reference.
67  */
68 #define CK_CC_WEAKREF __attribute__((weakref))
69 
70 /*
71  * Alignment attribute.
72  */
73 #define CK_CC_ALIGN(B) __attribute__((aligned(B)))
74 
75 /*
76  * Cache align.
77  */
78 #define CK_CC_CACHELINE CK_CC_ALIGN(CK_MD_CACHELINE)
79 
80 /*
81  * These are functions which should be avoided.
82  */
83 #ifdef __freestanding__
84 #pragma GCC poison malloc free
85 #endif
86 
87 /*
88  * Branch execution hints.
89  */
90 #define CK_CC_LIKELY(x) (__builtin_expect(!!(x), 1))
91 #define CK_CC_UNLIKELY(x) (__builtin_expect(!!(x), 0))
92 
93 /*
94  * Some compilers are overly strict regarding aliasing semantics.
95  * Unfortunately, in many cases it makes more sense to pay aliasing
96  * cost rather than overly expensive register spillage.
97  */
98 #define CK_CC_ALIASED __attribute__((__may_alias__))
99 
100 /*
101  * Compile-time typeof
102  */
103 #define CK_CC_TYPEOF(X, DEFAULT) __typeof__(X)
104 
105 /*
106  * Portability wrappers for bitwise ops.
107  */
108 
109 #define CK_F_CC_FFS
110 #define CK_F_CC_CLZ
111 #define CK_F_CC_CTZ
112 #define CK_F_CC_POPCOUNT
113 
114 CK_CC_INLINE static int
115 ck_cc_ffs(unsigned int x)
116 {
117 
118 	return __builtin_ffs(x);
119 }
120 
121 CK_CC_INLINE static int
122 ck_cc_clz(unsigned int x)
123 {
124 
125 	return __builtin_clz(x);
126 }
127 
128 CK_CC_INLINE static int
129 ck_cc_ctz(unsigned int x)
130 {
131 
132 	return __builtin_ctz(x);
133 }
134 
135 CK_CC_INLINE static int
136 ck_cc_popcount(unsigned int x)
137 {
138 
139 	return __builtin_popcount(x);
140 }
141 
142 #endif /* CK_GCC_CC_H */
143