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
43 #if __has_include(<vppinfra/config.h>)
44 #include <vppinfra/config.h>
48 #include <x86intrin.h>
51 /* Standalone means to not assume we are running on a Unix box. */
52 #if ! defined (CLIB_STANDALONE) && ! defined (CLIB_LINUX_KERNEL)
56 #include <vppinfra/types.h>
57 #include <vppinfra/atomics.h>
59 /* Global DEBUG flag. Setting this to 1 or 0 turns off
60 ASSERT (see vppinfra/error.h) & other debugging code. */
66 #define NULL ((void *) 0)
69 #define BITS(x) (8*sizeof(x))
70 #define ARRAY_LEN(x) (sizeof (x)/sizeof (x[0]))
72 #define _STRUCT_FIELD(t,f) (((t *) 0)->f)
73 #define STRUCT_OFFSET_OF(t,f) offsetof(t, f)
74 #define STRUCT_BIT_OFFSET_OF(t,f) (BITS(u8) * STRUCT_OFFSET_OF (t, f))
75 #define STRUCT_SIZE_OF(t,f) (sizeof (_STRUCT_FIELD (t, f)))
76 #define STRUCT_BITS_OF(t,f) (BITS (_STRUCT_FIELD (t, f)))
77 #define STRUCT_ARRAY_LEN(t,f) ARRAY_LEN (_STRUCT_FIELD (t, f))
78 #define STRUCT_MARK(mark) u8 mark[0]
79 #define STRUCT_MARK_PTR(v, f) &(v)->f
81 /* Stride in bytes between struct array elements. */
82 #define STRUCT_STRIDE_OF(t,f) \
83 ( ((uword) & (((t *) 0)[1].f)) \
84 - ((uword) & (((t *) 0)[0].f)))
86 #define STRUCT_OFFSET_OF_VAR(v,f) ((uword) (&(v)->f) - (uword) (v))
88 /* Used to pack structure elements. */
89 #define CLIB_PACKED(x) x __attribute__ ((packed))
90 #define CLIB_UNUSED(x) x __attribute__ ((unused))
92 /* similar to CLIB_CACHE_LINE_ALIGN_MARK() but with arbitrary alignment */
93 #define CLIB_ALIGN_MARK(name, alignment) u8 name[0] __attribute__((aligned(alignment)))
95 /* Make a string from the macro's argument */
96 #define CLIB_STRING_MACRO(x) #x
98 #define __clib_unused __attribute__ ((unused))
99 #define __clib_weak __attribute__ ((weak))
100 #define __clib_packed __attribute__ ((packed))
101 #define __clib_constructor __attribute__ ((constructor))
102 #define __clib_noinline __attribute__ ((noinline))
103 #define __clib_noclone __attribute__ ((noclone))
104 #define __clib_aligned(x) __attribute__ ((aligned(x)))
105 #define __clib_section(s) __attribute__ ((section(s)))
106 #define __clib_warn_unused_result __attribute__ ((warn_unused_result))
107 #define __clib_export __attribute__ ((visibility("default")))
109 #define never_inline __attribute__ ((__noinline__))
112 #define always_inline static inline
113 #define static_always_inline static inline
115 #define always_inline static inline __attribute__ ((__always_inline__))
116 #define static_always_inline static inline __attribute__ ((__always_inline__))
120 /* Reserved (unused) structure element with address offset between
122 #define CLIB_PAD_FROM_TO(from,to) u8 pad_##from[(to) - (from)]
124 /* Hints to compiler about hot/cold code. */
125 #define PREDICT_FALSE(x) __builtin_expect((x),0)
126 #define PREDICT_TRUE(x) __builtin_expect((x),1)
127 #define COMPILE_TIME_CONST(x) __builtin_constant_p (x)
128 #define CLIB_ASSUME(x) \
132 __builtin_unreachable (); \
138 * prevent compiler to reorder memory access across this boundary
139 * prevent compiler to cache values in register (force reload)
140 * Not to be confused with CPU memory barrier below
142 #define CLIB_COMPILER_BARRIER() asm volatile ("":::"memory")
144 /* Full memory barrier (read and write). */
145 #define CLIB_MEMORY_BARRIER() __sync_synchronize ()
148 #define CLIB_MEMORY_STORE_BARRIER() __builtin_ia32_sfence ()
150 #define CLIB_MEMORY_STORE_BARRIER() __sync_synchronize ()
153 /* Arranges for function to be called before main. */
154 #define INIT_FUNCTION(decl) \
155 decl __attribute ((constructor)); \
158 /* Arranges for function to be called before exit. */
159 #define EXIT_FUNCTION(decl) \
160 decl __attribute ((destructor)); \
163 /* Use __builtin_clz if available. */
165 #define count_leading_zeros(x) __builtin_clzll (x)
166 #define count_trailing_zeros(x) __builtin_ctzll (x)
168 #define count_leading_zeros(x) __builtin_clzl (x)
169 #define count_trailing_zeros(x) __builtin_ctzl (x)
172 #if defined (count_leading_zeros)
174 clear_lowest_set_bit (uword x)
177 return _blsr_u64 (x);
179 return x ^ (1ULL << count_trailing_zeros (x));
187 n = count_leading_zeros (x);
188 return BITS (uword) - n - 1;
194 uword a = x, b = BITS (uword) / 2, c = 0, r = 0;
196 /* Reduce x to 4 bit result. */
205 if (BITS (uword) > 32)
212 /* Do table lookup on 4 bit partial. */
213 if (BITS (uword) > 32)
215 const u64 table = 0x3333333322221104LL;
216 uword t = (table >> (4 * a)) & 0xf;
217 r = t < 4 ? r + t : ~0;
221 const u32 table = 0x22221104;
222 uword t = (a & 8) ? 3 : ((table >> (4 * a)) & 0xf);
223 r = t < 4 ? r + t : ~0;
233 uword l = min_log2 (x);
234 if (x > ((uword) 1 << l))
242 if (BITS (uword) == 64)
263 return _bzhi_u64 (-1ULL, x);
265 return ((uword) 1 << x) - (uword) 1;
271 word y = (word) 1 << min_log2 (x);
280 return 0 == (x & (x - 1));
284 round_down_pow2 (uword x, uword pow2)
286 return (x) & ~(pow2 - 1);
290 round_pow2 (uword x, uword pow2)
292 return (x + pow2 - 1) & ~(pow2 - 1);
296 round_pow2_u64 (u64 x, u64 pow2)
298 return (x + pow2 - 1) & ~(pow2 - 1);
308 log2_first_set (uword x)
311 #ifdef count_trailing_zeros
312 result = count_trailing_zeros (x);
314 result = min_log2 (first_set (x));
320 flt_round_down (f64 x)
326 flt_round_nearest (f64 x)
328 return (word) (x + .5);
332 flt_round_to_multiple (f64 x, f64 f)
334 return f * flt_round_nearest (x / f);
338 extract_bits (uword x, int start, int count)
341 return _bextr_u64 (x, start, count);
343 return (x >> start) & pow2_mask (count);
346 #define clib_max(x,y) \
348 __typeof__ (x) _x = (x); \
349 __typeof__ (y) _y = (y); \
353 #define clib_min(x,y) \
355 __typeof__ (x) _x = (x); \
356 __typeof__ (y) _y = (y); \
360 #define clib_clamp(x,lo,hi) \
362 __typeof__ (x) _x = (x); \
363 __typeof__ (lo) _lo = (lo); \
364 __typeof__ (hi) _hi = (hi); \
365 _x < _lo ? _lo : (_x > _hi ? _hi : _x); \
368 #define clib_abs(x) \
370 __typeof__ (x) _x = (x); \
374 /* Standard standalone-only function declarations. */
376 void clib_standalone_init (void *memory, uword memory_bytes);
378 void qsort (void *base, uword n, uword size,
379 int (*)(const void *, const void *));
382 /* Stack backtrace. */
384 clib_backtrace (uword * callers, uword max_callers, uword n_frames_to_skip);
386 #include <vppinfra/byte_order.h>
387 #endif /* included_clib_h */
390 * fd.io coding-style-patch-verification: ON
393 * eval: (c-set-style "gnu")