libecb/ecb.h

/*
 * libecb - http://software.schmorp.de/pkg/libecb
 *
 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
 * Copyright (©) 2011 Emanuele Giaquinta
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, are permitted provided that the following conditions are met:
 *
 *   1.  Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *
 *   2.  Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef ECB_H
#define ECB_H

#ifdef _WIN32
  typedef   signed char   int8_t;
  typedef unsigned char  uint8_t;
  typedef   signed short  int16_t;
  typedef unsigned short uint16_t;
  typedef   signed int    int32_t;
  typedef unsigned int   uint32_t;
  #if __GNUC__
    typedef   signed long long int64_t;
    typedef unsigned long long uint64_t;
  #else /* _MSC_VER || __BORLANDC__ */
    typedef   signed __int64   int64_t;
    typedef unsigned __int64   uint64_t;
  #endif
#else
  #include <inttypes.h>
#endif

/* many compilers define _GNUC_ to some versions but then only implement
 * what their idiot authors think are the "more important" extensions,
 * causing enormous grief in return for some better fake benchmark numbers.
 * or so.
 * we try to detect these and simply assume they are not gcc - if they have
 * an issue with that they should have done it right in the first place.
 */
#ifndef ECB_GCC_VERSION
  #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
    #define ECB_GCC_VERSION(major,minor) 0
  #else
    #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
  #endif
#endif

/*****************************************************************************/

/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
/* ECB_NO_SMP     - ecb might be used in multiple threads, but only on a single cpu */

#if ECB_NO_THREADS || ECB_NO_SMP
  #define ECB_MEMORY_FENCE do { } while (0)
#endif

#ifndef ECB_MEMORY_FENCE
  #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || defined(__clang__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
    #if __i386 || __i386__
      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
      #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
      #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
    #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mfence" : : : "memory")
      #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
    #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("sync" : : : "memory")
    #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \
       || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)
      #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
    #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \
       || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ )
      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("dmb" : : : "memory")
    #elif __sparc || __sparc__
      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
      #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore |             #StoreStore")
    #endif
  #endif
#endif

#ifndef ECB_MEMORY_FENCE
  #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__)
    #define ECB_MEMORY_FENCE         __sync_synchronize ()
    /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
    /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release      (&dummy   ); }) */
  #elif _MSC_VER >= 1400 /* VC++ 2005 */
    #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
    #define ECB_MEMORY_FENCE         _ReadWriteBarrier ()
    #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
    #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
  #elif defined(_WIN32)
    #include <WinNT.h>
    #define ECB_MEMORY_FENCE         MemoryBarrier () /* actually just xchg on x86... scary */
  #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
    #include <mbarrier.h>
    #define ECB_MEMORY_FENCE         __machine_rw_barrier ()
    #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier  ()
    #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier  ()
  #endif
#endif

#ifndef ECB_MEMORY_FENCE
  #if !ECB_AVOID_PTHREADS
    /*
     * if you get undefined symbol references to pthread_mutex_lock,
     * or failure to find pthread.h, then you should implement
     * the ECB_MEMORY_FENCE operations for your cpu/compiler
     * OR provide pthread.h and link against the posix thread library
     * of your system.
     */
    #include <pthread.h>
    #define ECB_NEEDS_PTHREADS 1
    #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1

    static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
    #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
  #endif
#endif

#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
  #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
#endif

#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
  #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
#endif

/*****************************************************************************/

#define ECB_C99 (__STDC_VERSION__ >= 199901L)

#if __cplusplus
  #define ecb_inline static inline
#elif ECB_GCC_VERSION(2,5)
  #define ecb_inline static __inline__
#elif ECB_C99
  #define ecb_inline static inline
#else
  #define ecb_inline static
#endif

#if ECB_GCC_VERSION(3,3)
  #define ecb_restrict __restrict__
#elif ECB_C99
  #define ecb_restrict restrict
#else
  #define ecb_restrict
#endif

typedef int ecb_bool;

#define ECB_CONCAT_(a, b) a ## b
#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
#define ECB_STRINGIFY_(a) # a
#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)

#define ecb_function_ ecb_inline

#if ECB_GCC_VERSION(3,1)
  #define ecb_attribute(attrlist)        __attribute__(attrlist)
  #define ecb_is_constant(expr)          __builtin_constant_p (expr)
  #define ecb_expect(expr,value)         __builtin_expect ((expr),(value))
  #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
#else
  #define ecb_attribute(attrlist)
  #define ecb_is_constant(expr)          0
  #define ecb_expect(expr,value)         (expr)
  #define ecb_prefetch(addr,rw,locality)
#endif

/* no emulation for ecb_decltype */
#if ECB_GCC_VERSION(4,5)
  #define ecb_decltype(x) __decltype(x)
#elif ECB_GCC_VERSION(3,0)
  #define ecb_decltype(x) __typeof(x)
#endif

#define ecb_noinline   ecb_attribute ((__noinline__))
#define ecb_noreturn   ecb_attribute ((__noreturn__))
#define ecb_unused     ecb_attribute ((__unused__))
#define ecb_const      ecb_attribute ((__const__))
#define ecb_pure       ecb_attribute ((__pure__))

#if ECB_GCC_VERSION(4,3)
  #define ecb_artificial ecb_attribute ((__artificial__))
  #define ecb_hot        ecb_attribute ((__hot__))
  #define ecb_cold       ecb_attribute ((__cold__))
#else
  #define ecb_artificial
  #define ecb_hot
  #define ecb_cold
#endif

/* put around conditional expressions if you are very sure that the  */
/* expression is mostly true or mostly false. note that these return */
/* booleans, not the expression.                                     */
#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
#define ecb_expect_true(expr)  ecb_expect (!!(expr), 1)
/* for compatibility to the rest of the world */
#define ecb_likely(expr)   ecb_expect_true  (expr)
#define ecb_unlikely(expr) ecb_expect_false (expr)

/* count trailing zero bits and count # of one bits */
#if ECB_GCC_VERSION(3,4)
  /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
  #define ecb_ld32(x)      (__builtin_clz      (x) ^ 31)
  #define ecb_ld64(x)      (__builtin_clzll    (x) ^ 63)
  #define ecb_ctz32(x)      __builtin_ctz      (x)
  #define ecb_ctz64(x)      __builtin_ctzll    (x)
  #define ecb_popcount32(x) __builtin_popcount (x)
  /* no popcountll */
#else
  ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
  ecb_function_ int
  ecb_ctz32 (uint32_t x)
  {
    int r = 0;

    x &= ~x + 1; /* this isolates the lowest bit */

#if ECB_branchless_on_i386
    r += !!(x & 0xaaaaaaaa) << 0;
    r += !!(x & 0xcccccccc) << 1;
    r += !!(x & 0xf0f0f0f0) << 2;
    r += !!(x & 0xff00ff00) << 3;
    r += !!(x & 0xffff0000) << 4;
#else
    if (x & 0xaaaaaaaa) r +=  1;
    if (x & 0xcccccccc) r +=  2;
    if (x & 0xf0f0f0f0) r +=  4;
    if (x & 0xff00ff00) r +=  8;
    if (x & 0xffff0000) r += 16;
#endif

    return r;
  }

  ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
  ecb_function_ int
  ecb_ctz64 (uint64_t x)
  {
    int shift = x & 0xffffffffU ? 0 : 32;
    return ecb_ctz32 (x >> shift) + shift;
  }

  ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
  ecb_function_ int
  ecb_popcount32 (uint32_t x)
  {
    x -=  (x >> 1) & 0x55555555;
    x  = ((x >> 2) & 0x33333333) + (x & 0x33333333);
    x  = ((x >> 4) + x) & 0x0f0f0f0f;
    x *= 0x01010101;

    return x >> 24;
  }

  ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
  ecb_function_ int ecb_ld32 (uint32_t x)
  {
    int r = 0;

    if (x >> 16) { x >>= 16; r += 16; }
    if (x >>  8) { x >>=  8; r +=  8; }
    if (x >>  4) { x >>=  4; r +=  4; }
    if (x >>  2) { x >>=  2; r +=  2; }
    if (x >>  1) {           r +=  1; }

    return r;
  }

  ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
  ecb_function_ int ecb_ld64 (uint64_t x)
  {
    int r = 0;

    if (x >> 32) { x >>= 32; r += 32; }

    return r + ecb_ld32 (x);
  }
#endif

ecb_function_ uint8_t  ecb_bitrev8  (uint8_t  x) ecb_const;
ecb_function_ uint8_t  ecb_bitrev8  (uint8_t  x)
{
  return (  (x * 0x0802U & 0x22110U)
          | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16; 
}

ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
{
  x = ((x >>  1) &     0x5555) | ((x &     0x5555) <<  1);
  x = ((x >>  2) &     0x3333) | ((x &     0x3333) <<  2);
  x = ((x >>  4) &     0x0f0f) | ((x &     0x0f0f) <<  4);
  x = ( x >>  8              ) | ( x               <<  8);

  return x;
}

ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
{
  x = ((x >>  1) & 0x55555555) | ((x & 0x55555555) <<  1);
  x = ((x >>  2) & 0x33333333) | ((x & 0x33333333) <<  2);
  x = ((x >>  4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) <<  4);
  x = ((x >>  8) & 0x00ff00ff) | ((x & 0x00ff00ff) <<  8);
  x = ( x >> 16              ) | ( x               << 16);

  return x;
}

/* popcount64 is only available on 64 bit cpus as gcc builtin */
/* so for this version we are lazy */
ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
ecb_function_ int
ecb_popcount64 (uint64_t x)
{
  return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
}

ecb_inline uint8_t  ecb_rotl8  (uint8_t  x, unsigned int count) ecb_const;
ecb_inline uint8_t  ecb_rotr8  (uint8_t  x, unsigned int count) ecb_const;
ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;

ecb_inline uint8_t  ecb_rotl8  (uint8_t  x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
ecb_inline uint8_t  ecb_rotr8  (uint8_t  x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }

#if ECB_GCC_VERSION(4,3)
  #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
  #define ecb_bswap32(x)  __builtin_bswap32 (x)
  #define ecb_bswap64(x)  __builtin_bswap64 (x)
#else
  ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
  ecb_function_ uint16_t
  ecb_bswap16 (uint16_t x)
  {
    return ecb_rotl16 (x, 8);
  }

  ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
  ecb_function_ uint32_t
  ecb_bswap32 (uint32_t x)
  {
    return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
  }

  ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
  ecb_function_ uint64_t
  ecb_bswap64 (uint64_t x)
  {
    return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
  }
#endif

#if ECB_GCC_VERSION(4,5)
  #define ecb_unreachable() __builtin_unreachable ()
#else
  /* this seems to work fine, but gcc always emits a warning for it :/ */
  ecb_function_ void ecb_unreachable (void) ecb_noreturn;
  ecb_function_ void ecb_unreachable (void) { }
#endif

/* try to tell the compiler that some condition is definitely true */
#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)

ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
ecb_function_ unsigned char
ecb_byteorder_helper (void)
{
  const uint32_t u = 0x11223344;
  return *(unsigned char *)&u;
}

ecb_function_ ecb_bool ecb_big_endian    (void) ecb_const;
ecb_function_ ecb_bool ecb_big_endian    (void) { return ecb_byteorder_helper () == 0x11; }
ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }

#if ECB_GCC_VERSION(3,0) || ECB_C99
  #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
#else
  #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
#endif

#if __cplusplus
  template<typename T>
  static inline T ecb_div_rd (T val, T div)
  {
    return val < 0 ? - ((-val + div - 1) / div) : (val          ) / div;
  }
  template<typename T>
  static inline T ecb_div_ru (T val, T div)
  {
    return val < 0 ? - ((-val          ) / div) : (val + div - 1) / div;
  }
#else
  #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val)            ) / (div))
  #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val)            ) / (div)) : ((val) + (div) - 1) / (div))
#endif

#if ecb_cplusplus_does_not_suck
  /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
  template<typename T, int N>
  static inline int ecb_array_length (const T (&arr)[N])
  {
    return N;
  }
#else
  #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
#endif

#endif

Revision:	1.74
Committed:	Wed Jan 18 12:51:44 2012 UTC (12 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rxvt-unicode-rel-9_15
Changes since 1.73:	+3 -3 lines
Log Message:	play safer
#	Content
1	/*
2	* libecb - http://software.schmorp.de/pkg/libecb
3	*
4	* Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
5	* Copyright (©) 2011 Emanuele Giaquinta
6	* All rights reserved.
7	*
8	* Redistribution and use in source and binary forms, with or without modifica-
9	* tion, are permitted provided that the following conditions are met:
10	*
11	* 1. Redistributions of source code must retain the above copyright notice,
12	* this list of conditions and the following disclaimer.
13	*
14	* 2. Redistributions in binary form must reproduce the above copyright
15	* notice, this list of conditions and the following disclaimer in the
16	* documentation and/or other materials provided with the distribution.
17	*
18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
19	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
20	* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
21	* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
22	* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24	* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
26	* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27	* OF THE POSSIBILITY OF SUCH DAMAGE.
28	*/
29
30	#ifndef ECB_H
31	#define ECB_H
32
33	#ifdef _WIN32
34	typedef signed char int8_t;
35	typedef unsigned char uint8_t;
36	typedef signed short int16_t;
37	typedef unsigned short uint16_t;
38	typedef signed int int32_t;
39	typedef unsigned int uint32_t;
40	#if __GNUC__
41	typedef signed long long int64_t;
42	typedef unsigned long long uint64_t;
43	#else /* _MSC_VER \|\| __BORLANDC__ */
44	typedef signed __int64 int64_t;
45	typedef unsigned __int64 uint64_t;
46	#endif
47	#else
48	#include <inttypes.h>
49	#endif
50
51	/* many compilers define _GNUC_ to some versions but then only implement
52	* what their idiot authors think are the "more important" extensions,
53	* causing enormous grief in return for some better fake benchmark numbers.
54	* or so.
55	* we try to detect these and simply assume they are not gcc - if they have
56	* an issue with that they should have done it right in the first place.
57	*/
58	#ifndef ECB_GCC_VERSION
59	#if !defined(__GNUC_MINOR__) \|\| defined(__INTEL_COMPILER) \|\| defined(__SUNPRO_C) \|\| defined(__SUNPRO_CC) \|\| defined(__llvm__) \|\| defined(__clang__)
60	#define ECB_GCC_VERSION(major,minor) 0
61	#else
62	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
63	#endif
64	#endif
65
66	/*****************************************************************************/
67
68	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
69	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
70
71	#if ECB_NO_THREADS \|\| ECB_NO_SMP
72	#define ECB_MEMORY_FENCE do { } while (0)
73	#endif
74
75	#ifndef ECB_MEMORY_FENCE
76	#if ECB_GCC_VERSION(2,5) \|\| defined(__INTEL_COMPILER) \|\| defined(__clang__) \|\| __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
77	#if __i386 \|\| __i386__
78	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
79	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
80	#define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
81	#elif __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__
82	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
83	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
84	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
85	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__
86	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
87	#elif defined(__ARM_ARCH_6__ ) \|\| defined(__ARM_ARCH_6J__ ) \
88	\|\| defined(__ARM_ARCH_6K__) \|\| defined(__ARM_ARCH_6ZK__)
89	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
90	#elif defined(__ARM_ARCH_7__ ) \|\| defined(__ARM_ARCH_7A__ ) \
91	\|\| defined(__ARM_ARCH_7M__) \|\| defined(__ARM_ARCH_7R__ )
92	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
93	#elif __sparc \|\| __sparc__
94	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad \| " : : : "memory")
95	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")
96	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")
97	#endif
98	#endif
99	#endif
100
101	#ifndef ECB_MEMORY_FENCE
102	#if ECB_GCC_VERSION(4,4) \|\| defined(__INTEL_COMPILER) \|\| defined(__clang__)
103	#define ECB_MEMORY_FENCE __sync_synchronize ()
104	/#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) /
105	/#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) /
106	#elif _MSC_VER >= 1400 /* VC++ 2005 */
107	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
108	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()
109	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
110	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
111	#elif defined(_WIN32)
112	#include <WinNT.h>
113	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
114	#elif __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
115	#include <mbarrier.h>
116	#define ECB_MEMORY_FENCE __machine_rw_barrier ()
117	#define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
118	#define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
119	#endif
120	#endif
121
122	#ifndef ECB_MEMORY_FENCE
123	#if !ECB_AVOID_PTHREADS
124	/*
125	* if you get undefined symbol references to pthread_mutex_lock,
126	* or failure to find pthread.h, then you should implement
127	* the ECB_MEMORY_FENCE operations for your cpu/compiler
128	* OR provide pthread.h and link against the posix thread library
129	* of your system.
130	*/
131	#include <pthread.h>
132	#define ECB_NEEDS_PTHREADS 1
133	#define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
134
135	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
136	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
137	#endif
138	#endif
139
140	#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
141	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
142	#endif
143
144	#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
145	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
146	#endif
147
148	/*****************************************************************************/
149
150	#define ECB_C99 (__STDC_VERSION__ >= 199901L)
151
152	#if __cplusplus
153	#define ecb_inline static inline
154	#elif ECB_GCC_VERSION(2,5)
155	#define ecb_inline static __inline__
156	#elif ECB_C99
157	#define ecb_inline static inline
158	#else
159	#define ecb_inline static
160	#endif
161
162	#if ECB_GCC_VERSION(3,3)
163	#define ecb_restrict __restrict__
164	#elif ECB_C99
165	#define ecb_restrict restrict
166	#else
167	#define ecb_restrict
168	#endif
169
170	typedef int ecb_bool;
171
172	#define ECB_CONCAT_(a, b) a ## b
173	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
174	#define ECB_STRINGIFY_(a) # a
175	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
176
177	#define ecb_function_ ecb_inline
178
179	#if ECB_GCC_VERSION(3,1)
180	#define ecb_attribute(attrlist) __attribute__(attrlist)
181	#define ecb_is_constant(expr) __builtin_constant_p (expr)
182	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))
183	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
184	#else
185	#define ecb_attribute(attrlist)
186	#define ecb_is_constant(expr) 0
187	#define ecb_expect(expr,value) (expr)
188	#define ecb_prefetch(addr,rw,locality)
189	#endif
190
191	/* no emulation for ecb_decltype */
192	#if ECB_GCC_VERSION(4,5)
193	#define ecb_decltype(x) __decltype(x)
194	#elif ECB_GCC_VERSION(3,0)
195	#define ecb_decltype(x) __typeof(x)
196	#endif
197
198	#define ecb_noinline ecb_attribute ((__noinline__))
199	#define ecb_noreturn ecb_attribute ((__noreturn__))
200	#define ecb_unused ecb_attribute ((__unused__))
201	#define ecb_const ecb_attribute ((__const__))
202	#define ecb_pure ecb_attribute ((__pure__))
203
204	#if ECB_GCC_VERSION(4,3)
205	#define ecb_artificial ecb_attribute ((__artificial__))
206	#define ecb_hot ecb_attribute ((__hot__))
207	#define ecb_cold ecb_attribute ((__cold__))
208	#else
209	#define ecb_artificial
210	#define ecb_hot
211	#define ecb_cold
212	#endif
213
214	/* put around conditional expressions if you are very sure that the */
215	/* expression is mostly true or mostly false. note that these return */
216	/* booleans, not the expression. */
217	#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
218	#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
219	/* for compatibility to the rest of the world */
220	#define ecb_likely(expr) ecb_expect_true (expr)
221	#define ecb_unlikely(expr) ecb_expect_false (expr)
222
223	/* count trailing zero bits and count # of one bits */
224	#if ECB_GCC_VERSION(3,4)
225	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
226	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)
227	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
228	#define ecb_ctz32(x) __builtin_ctz (x)
229	#define ecb_ctz64(x) __builtin_ctzll (x)
230	#define ecb_popcount32(x) __builtin_popcount (x)
231	/* no popcountll */
232	#else
233	ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
234	ecb_function_ int
235	ecb_ctz32 (uint32_t x)
236	{
237	int r = 0;
238
239	x &= ~x + 1; /* this isolates the lowest bit */
240
241	#if ECB_branchless_on_i386
242	r += !!(x & 0xaaaaaaaa) << 0;
243	r += !!(x & 0xcccccccc) << 1;
244	r += !!(x & 0xf0f0f0f0) << 2;
245	r += !!(x & 0xff00ff00) << 3;
246	r += !!(x & 0xffff0000) << 4;
247	#else
248	if (x & 0xaaaaaaaa) r += 1;
249	if (x & 0xcccccccc) r += 2;
250	if (x & 0xf0f0f0f0) r += 4;
251	if (x & 0xff00ff00) r += 8;
252	if (x & 0xffff0000) r += 16;
253	#endif
254
255	return r;
256	}
257
258	ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
259	ecb_function_ int
260	ecb_ctz64 (uint64_t x)
261	{
262	int shift = x & 0xffffffffU ? 0 : 32;
263	return ecb_ctz32 (x >> shift) + shift;
264	}
265
266	ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
267	ecb_function_ int
268	ecb_popcount32 (uint32_t x)
269	{
270	x -= (x >> 1) & 0x55555555;
271	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
272	x = ((x >> 4) + x) & 0x0f0f0f0f;
273	x *= 0x01010101;
274
275	return x >> 24;
276	}
277
278	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
279	ecb_function_ int ecb_ld32 (uint32_t x)
280	{
281	int r = 0;
282
283	if (x >> 16) { x >>= 16; r += 16; }
284	if (x >> 8) { x >>= 8; r += 8; }
285	if (x >> 4) { x >>= 4; r += 4; }
286	if (x >> 2) { x >>= 2; r += 2; }
287	if (x >> 1) { r += 1; }
288
289	return r;
290	}
291
292	ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
293	ecb_function_ int ecb_ld64 (uint64_t x)
294	{
295	int r = 0;
296
297	if (x >> 32) { x >>= 32; r += 32; }
298
299	return r + ecb_ld32 (x);
300	}
301	#endif
302
303	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
304	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
305	{
306	return ( (x * 0x0802U & 0x22110U)
307	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
308	}
309
310	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
311	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
312	{
313	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);
314	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);
315	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);
316	x = ( x >> 8 ) \| ( x << 8);
317
318	return x;
319	}
320
321	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
322	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
323	{
324	x = ((x >> 1) & 0x55555555) \| ((x & 0x55555555) << 1);
325	x = ((x >> 2) & 0x33333333) \| ((x & 0x33333333) << 2);
326	x = ((x >> 4) & 0x0f0f0f0f) \| ((x & 0x0f0f0f0f) << 4);
327	x = ((x >> 8) & 0x00ff00ff) \| ((x & 0x00ff00ff) << 8);
328	x = ( x >> 16 ) \| ( x << 16);
329
330	return x;
331	}
332
333	/* popcount64 is only available on 64 bit cpus as gcc builtin */
334	/* so for this version we are lazy */
335	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
336	ecb_function_ int
337	ecb_popcount64 (uint64_t x)
338	{
339	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
340	}
341
342	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
343	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
344	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
345	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
346	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
347	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
348	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
349	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
350
351	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }
352	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) \| (x >> count); }
353	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) \| (x << count); }
354	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) \| (x >> count); }
355	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) \| (x << count); }
356	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) \| (x >> count); }
357	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) \| (x << count); }
358	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }
359
360	#if ECB_GCC_VERSION(4,3)
361	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
362	#define ecb_bswap32(x) __builtin_bswap32 (x)
363	#define ecb_bswap64(x) __builtin_bswap64 (x)
364	#else
365	ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
366	ecb_function_ uint16_t
367	ecb_bswap16 (uint16_t x)
368	{
369	return ecb_rotl16 (x, 8);
370	}
371
372	ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
373	ecb_function_ uint32_t
374	ecb_bswap32 (uint32_t x)
375	{
376	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);
377	}
378
379	ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
380	ecb_function_ uint64_t
381	ecb_bswap64 (uint64_t x)
382	{
383	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);
384	}
385	#endif
386
387	#if ECB_GCC_VERSION(4,5)
388	#define ecb_unreachable() __builtin_unreachable ()
389	#else
390	/* this seems to work fine, but gcc always emits a warning for it :/ */
391	ecb_function_ void ecb_unreachable (void) ecb_noreturn;
392	ecb_function_ void ecb_unreachable (void) { }
393	#endif
394
395	/* try to tell the compiler that some condition is definitely true */
396	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
397
398	ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
399	ecb_function_ unsigned char
400	ecb_byteorder_helper (void)
401	{
402	const uint32_t u = 0x11223344;
403	return (unsigned char )&u;
404	}
405
406	ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
407	ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
408	ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
409	ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
410
411	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99
412	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
413	#else
414	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
415	#endif
416
417	#if __cplusplus
418	template<typename T>
419	static inline T ecb_div_rd (T val, T div)
420	{
421	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
422	}
423	template<typename T>
424	static inline T ecb_div_ru (T val, T div)
425	{
426	return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
427	}
428	#else
429	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
430	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
431	#endif
432
433	#if ecb_cplusplus_does_not_suck
434	/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
435	template<typename T, int N>
436	static inline int ecb_array_length (const T (&arr)[N])
437	{
438	return N;
439	}
440	#else
441	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
442	#endif
443
444	#endif
445