2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 Copyright (c) 2001, 2002, 2003 Eliot Dresselhaus
18 Permission is hereby granted, free of charge, to any person obtaining
19 a copy of this software and associated documentation files (the
20 "Software"), to deal in the Software without restriction, including
21 without limitation the rights to use, copy, modify, merge, publish,
22 distribute, sublicense, and/or sell copies of the Software, and to
23 permit persons to whom the Software is furnished to do so, subject to
24 the following conditions:
26 The above copyright notice and this permission notice shall be
27 included in all copies or substantial portions of the Software.
29 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
30 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
31 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
32 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
33 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
34 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
35 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38 #ifndef included_clib_h
39 #define included_clib_h
41 /* Standalone means to not assume we are running on a Unix box. */
42 #if ! defined (CLIB_STANDALONE) && ! defined (CLIB_LINUX_KERNEL)
46 #include <vppinfra/types.h>
48 /* Global DEBUG flag. Setting this to 1 or 0 turns off
49 ASSERT (see vppinfra/error.h) & other debugging code. */
55 #define NULL ((void *) 0)
58 #define BITS(x) (8*sizeof(x))
59 #define ARRAY_LEN(x) (sizeof (x)/sizeof (x[0]))
61 #define _STRUCT_FIELD(t,f) (((t *) 0)->f)
62 #define STRUCT_OFFSET_OF(t,f) ((uword) & _STRUCT_FIELD (t, f))
63 #define STRUCT_BIT_OFFSET_OF(t,f) (BITS(u8) * (uword) & _STRUCT_FIELD (t, f))
64 #define STRUCT_SIZE_OF(t,f) (sizeof (_STRUCT_FIELD (t, f)))
65 #define STRUCT_BITS_OF(t,f) (BITS (_STRUCT_FIELD (t, f)))
66 #define STRUCT_ARRAY_LEN(t,f) ARRAY_LEN (_STRUCT_FIELD (t, f))
67 #define STRUCT_MARK(mark) u8 mark[0]
68 #define STRUCT_MARK_PTR(v, f) &(v)->f
70 /* Stride in bytes between struct array elements. */
71 #define STRUCT_STRIDE_OF(t,f) \
72 ( ((uword) & (((t *) 0)[1].f)) \
73 - ((uword) & (((t *) 0)[0].f)))
75 #define STRUCT_OFFSET_OF_VAR(v,f) ((uword) (&(v)->f) - (uword) (v))
77 /* Used to pack structure elements. */
78 #define CLIB_PACKED(x) x __attribute__ ((packed))
79 #define CLIB_UNUSED(x) x __attribute__ ((unused))
81 #define __clib_unused __attribute__ ((unused))
82 #define __clib_weak __attribute__ ((weak))
83 #define __clib_packed __attribute__ ((packed))
84 #define __clib_constructor __attribute__ ((constructor))
86 #define never_inline __attribute__ ((__noinline__))
89 #define always_inline static inline
90 #define static_always_inline static inline
92 #define always_inline static inline __attribute__ ((__always_inline__))
93 #define static_always_inline static inline __attribute__ ((__always_inline__))
97 /* Reserved (unused) structure element with address offset between
99 #define CLIB_PAD_FROM_TO(from,to) u8 pad_##from[(to) - (from)]
101 /* Hints to compiler about hot/cold code. */
102 #define PREDICT_FALSE(x) __builtin_expect((x),0)
103 #define PREDICT_TRUE(x) __builtin_expect((x),1)
105 /* Full memory barrier (read and write). */
106 #define CLIB_MEMORY_BARRIER() __sync_synchronize ()
109 #define CLIB_MEMORY_STORE_BARRIER() __builtin_ia32_sfence ()
111 #define CLIB_MEMORY_STORE_BARRIER() __sync_synchronize ()
114 /* Arranges for function to be called before main. */
115 #define INIT_FUNCTION(decl) \
116 decl __attribute ((constructor)); \
119 /* Arranges for function to be called before exit. */
120 #define EXIT_FUNCTION(decl) \
121 decl __attribute ((destructor)); \
124 /* Use __builtin_clz if available. */
126 #include <features.h>
127 #if __GNUC_PREREQ(3, 4)
129 #define count_leading_zeros(count,x) count = __builtin_clzll (x)
130 #define count_trailing_zeros(count,x) count = __builtin_ctzll (x)
132 #define count_leading_zeros(count,x) count = __builtin_clzl (x)
133 #define count_trailing_zeros(count,x) count = __builtin_ctzl (x)
138 #ifndef count_leading_zeros
140 /* Misc. integer arithmetic functions. */
142 #define count_leading_zeros(count, x) \
145 __asm__ ("bsrl %1,%0" \
146 : "=r" (_clz) : "rm" ((word) (x)));\
147 (count) = _clz ^ 31; \
150 #define count_trailing_zeros(count, x) \
151 __asm__ ("bsfl %1,%0" : "=r" (count) : "rm" ((word)(x)))
154 #if defined (__alpha__) && defined (HAVE_CIX)
155 #define count_leading_zeros(count, x) \
156 __asm__ ("ctlz %1,%0" \
157 : "=r" ((word) (count)) \
159 #define count_trailing_zeros(count, x) \
160 __asm__ ("cttz %1,%0" \
161 : "=r" ((word) (count)) \
163 #endif /* alpha && HAVE_CIX */
167 /* Select between 32/64 opcodes. */
169 #define count_leading_zeros(_count, _x) \
170 __asm__ ("clz %[count],%[x]" \
171 : [count] "=r" ((word) (_count)) \
172 : [x] "r" ((word) (_x)))
174 #define count_leading_zeros(_count, _x) \
175 __asm__ ("dclz %[count],%[x]" \
176 : [count] "=r" ((word) (_count)) \
177 : [x] "r" ((word) (_x)))
180 #endif /* __mips >= 4 */
182 #endif /* count_leading_zeros */
184 #if defined (count_leading_zeros)
189 count_leading_zeros (n, x);
190 return BITS (uword) - n - 1;
196 uword a = x, b = BITS (uword) / 2, c = 0, r = 0;
198 /* Reduce x to 4 bit result. */
207 if (BITS (uword) > 32)
214 /* Do table lookup on 4 bit partial. */
215 if (BITS (uword) > 32)
217 const u64 table = 0x3333333322221104LL;
218 uword t = (table >> (4 * a)) & 0xf;
219 r = t < 4 ? r + t : ~0;
223 const u32 table = 0x22221104;
224 uword t = (a & 8) ? 3 : ((table >> (4 * a)) & 0xf);
225 r = t < 4 ? r + t : ~0;
235 uword l = min_log2 (x);
236 if (x > ((uword) 1 << l))
244 if (BITS (uword) == 64)
264 return ((uword) 1 << x) - (uword) 1;
270 word y = (word) 1 << min_log2 (x);
279 return 0 == (x & (x - 1));
283 round_pow2 (uword x, uword pow2)
285 return (x + pow2 - 1) & ~(pow2 - 1);
289 round_pow2_u64 (u64 x, u64 pow2)
291 return (x + pow2 - 1) & ~(pow2 - 1);
301 log2_first_set (uword x)
304 #ifdef count_trailing_zeros
305 count_trailing_zeros (result, x);
307 result = min_log2 (first_set (x));
313 flt_round_down (f64 x)
319 flt_round_nearest (f64 x)
321 return (word) (x + .5);
325 flt_round_to_multiple (f64 x, f64 f)
327 return f * flt_round_nearest (x / f);
330 #define clib_max(x,y) \
332 __typeof__ (x) _x = (x); \
333 __typeof__ (y) _y = (y); \
337 #define clib_min(x,y) \
339 __typeof__ (x) _x = (x); \
340 __typeof__ (y) _y = (y); \
344 #define clib_abs(x) \
346 __typeof__ (x) _x = (x); \
350 /* Standard standalone-only function declarations. */
352 void clib_standalone_init (void *memory, uword memory_bytes);
354 void qsort (void *base, uword n, uword size,
355 int (*)(const void *, const void *));
358 /* Stack backtrace. */
360 clib_backtrace (uword * callers, uword max_callers, uword n_frames_to_skip);
362 #endif /* included_clib_h */
365 * fd.io coding-style-patch-verification: ON
368 * eval: (c-set-style "gnu")