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/* |
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* libecb - http://software.schmorp.de/pkg/libecb |
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* |
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* Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de> |
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* Copyright (©) 2011 Emanuele Giaquinta |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without modifica- |
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* tion, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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|
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#ifndef ECB_H |
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#define ECB_H |
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|
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#ifdef _WIN32 |
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typedef signed char int8_t; |
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typedef unsigned char uint8_t; |
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typedef signed short int16_t; |
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typedef unsigned short uint16_t; |
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typedef signed int int32_t; |
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typedef unsigned int uint32_t; |
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#if __GNUC__ |
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typedef signed long long int64_t; |
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typedef unsigned long long uint64_t; |
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#else /* _MSC_VER || __BORLANDC__ */ |
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typedef signed __int64 int64_t; |
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typedef unsigned __int64 uint64_t; |
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#endif |
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#else |
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#include <inttypes.h> |
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#endif |
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|
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/* many compilers define _GNUC_ to some versions but then only implement |
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* what their idiot authors think are the "more important" extensions, |
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* causing enormous grief in return for some better fake benchmark numbers. |
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* or so. |
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* we try to detect these and simply assume they are not gcc - if they have |
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* an issue with that they should have done it right in the first place. |
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*/ |
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#ifndef ECB_GCC_VERSION |
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#if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__) |
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#define ECB_GCC_VERSION(major,minor) 0 |
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#else |
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#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
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#endif |
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#endif |
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|
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/*****************************************************************************/ |
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|
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/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ |
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/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ |
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|
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#if ECB_NO_THREADS || ECB_NO_SMP |
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#define ECB_MEMORY_FENCE do { } while (0) |
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#endif |
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|
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#ifndef ECB_MEMORY_FENCE |
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#if ECB_GCC_VERSION(2,5) |
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#if __i386__ |
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#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") |
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#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ |
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#define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ |
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#elif __amd64 |
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#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") |
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#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") |
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#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ |
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#elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ |
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#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") |
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#elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \ |
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|| defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__) |
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#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") |
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#elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \ |
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|| defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ ) |
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#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") |
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#endif |
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#endif |
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#endif |
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|
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#ifndef ECB_MEMORY_FENCE |
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#if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) |
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#define ECB_MEMORY_FENCE __sync_synchronize () |
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/*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */ |
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/*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */ |
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#elif _MSC_VER >= 1400 /* VC++ 2005 */ |
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#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
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#define ECB_MEMORY_FENCE _ReadWriteBarrier () |
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#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
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#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
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#elif defined(_WIN32) |
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#include <WinNT.h> |
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#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ |
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#endif |
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#endif |
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|
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#ifndef ECB_MEMORY_FENCE |
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#if !ECB_AVOID_PTHREADS |
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/* |
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* if you get undefined symbol references to pthread_mutex_lock, |
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* or failure to find pthread.h, then you should implement |
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* the ECB_MEMORY_FENCE operations for your cpu/compiler |
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* OR provide pthread.h and link against the posix thread library |
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* of your system. |
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*/ |
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#include <pthread.h> |
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#define ECB_NEEDS_PTHREADS 1 |
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#define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1 |
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|
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static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; |
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#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) |
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#endif |
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#endif |
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|
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#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE) |
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#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
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#endif |
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|
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#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE) |
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#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
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#endif |
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|
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/*****************************************************************************/ |
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|
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#define ECB_C99 (__STDC_VERSION__ >= 199901L) |
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|
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#if __cplusplus |
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#define ecb_inline static inline |
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#elif ECB_GCC_VERSION(2,5) |
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#define ecb_inline static __inline__ |
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#elif ECB_C99 |
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#define ecb_inline static inline |
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#else |
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#define ecb_inline static |
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#endif |
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|
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#if ECB_GCC_VERSION(3,3) |
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#define ecb_restrict __restrict__ |
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#elif ECB_C99 |
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#define ecb_restrict restrict |
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#else |
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#define ecb_restrict |
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#endif |
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|
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typedef int ecb_bool; |
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|
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#define ECB_CONCAT_(a, b) a ## b |
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#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
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#define ECB_STRINGIFY_(a) # a |
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#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
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|
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#define ecb_function_ ecb_inline |
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|
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#if ECB_GCC_VERSION(3,1) |
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#define ecb_attribute(attrlist) __attribute__(attrlist) |
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#define ecb_is_constant(expr) __builtin_constant_p (expr) |
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#define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
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#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
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#else |
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#define ecb_attribute(attrlist) |
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#define ecb_is_constant(expr) 0 |
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#define ecb_expect(expr,value) (expr) |
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#define ecb_prefetch(addr,rw,locality) |
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#endif |
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|
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/* no emulation for ecb_decltype */ |
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#if ECB_GCC_VERSION(4,5) |
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#define ecb_decltype(x) __decltype(x) |
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#elif ECB_GCC_VERSION(3,0) |
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#define ecb_decltype(x) __typeof(x) |
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#endif |
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|
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#define ecb_noinline ecb_attribute ((__noinline__)) |
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#define ecb_noreturn ecb_attribute ((__noreturn__)) |
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#define ecb_unused ecb_attribute ((__unused__)) |
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#define ecb_const ecb_attribute ((__const__)) |
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#define ecb_pure ecb_attribute ((__pure__)) |
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|
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#if ECB_GCC_VERSION(4,3) |
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#define ecb_artificial ecb_attribute ((__artificial__)) |
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#define ecb_hot ecb_attribute ((__hot__)) |
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#define ecb_cold ecb_attribute ((__cold__)) |
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#else |
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#define ecb_artificial |
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#define ecb_hot |
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#define ecb_cold |
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#endif |
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|
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/* put around conditional expressions if you are very sure that the */ |
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/* expression is mostly true or mostly false. note that these return */ |
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/* booleans, not the expression. */ |
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#define ecb_expect_false(expr) ecb_expect (!!(expr), 0) |
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#define ecb_expect_true(expr) ecb_expect (!!(expr), 1) |
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/* for compatibility to the rest of the world */ |
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#define ecb_likely(expr) ecb_expect_true (expr) |
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#define ecb_unlikely(expr) ecb_expect_false (expr) |
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|
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/* count trailing zero bits and count # of one bits */ |
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#if ECB_GCC_VERSION(3,4) |
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/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */ |
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#define ecb_ld32(x) (__builtin_clz (x) ^ 31) |
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#define ecb_ld64(x) (__builtin_clzll (x) ^ 63) |
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#define ecb_ctz32(x) __builtin_ctz (x) |
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#define ecb_ctz64(x) __builtin_ctzll (x) |
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#define ecb_popcount32(x) __builtin_popcount (x) |
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/* no popcountll */ |
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#else |
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ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; |
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ecb_function_ int |
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ecb_ctz32 (uint32_t x) |
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{ |
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int r = 0; |
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|
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x &= ~x + 1; /* this isolates the lowest bit */ |
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|
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#if ECB_branchless_on_i386 |
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r += !!(x & 0xaaaaaaaa) << 0; |
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r += !!(x & 0xcccccccc) << 1; |
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r += !!(x & 0xf0f0f0f0) << 2; |
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r += !!(x & 0xff00ff00) << 3; |
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r += !!(x & 0xffff0000) << 4; |
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#else |
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if (x & 0xaaaaaaaa) r += 1; |
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if (x & 0xcccccccc) r += 2; |
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if (x & 0xf0f0f0f0) r += 4; |
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if (x & 0xff00ff00) r += 8; |
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if (x & 0xffff0000) r += 16; |
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#endif |
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|
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return r; |
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} |
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|
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ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const; |
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ecb_function_ int |
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ecb_ctz64 (uint64_t x) |
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{ |
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int shift = x & 0xffffffffU ? 0 : 32; |
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return ecb_ctz32 (x >> shift) + shift; |
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} |
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|
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ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
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ecb_function_ int |
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ecb_popcount32 (uint32_t x) |
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{ |
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x -= (x >> 1) & 0x55555555; |
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x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
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x = ((x >> 4) + x) & 0x0f0f0f0f; |
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x *= 0x01010101; |
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|
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return x >> 24; |
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} |
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|
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ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; |
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ecb_function_ int ecb_ld32 (uint32_t x) |
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{ |
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int r = 0; |
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|
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if (x >> 16) { x >>= 16; r += 16; } |
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if (x >> 8) { x >>= 8; r += 8; } |
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if (x >> 4) { x >>= 4; r += 4; } |
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if (x >> 2) { x >>= 2; r += 2; } |
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if (x >> 1) { r += 1; } |
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|
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return r; |
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} |
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|
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ecb_function_ int ecb_ld64 (uint64_t x) ecb_const; |
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ecb_function_ int ecb_ld64 (uint64_t x) |
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{ |
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int r = 0; |
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|
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if (x >> 32) { x >>= 32; r += 32; } |
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|
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return r + ecb_ld32 (x); |
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} |
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#endif |
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|
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/* popcount64 is only available on 64 bit cpus as gcc builtin */ |
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/* so for this version we are lazy */ |
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ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; |
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ecb_function_ int |
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ecb_popcount64 (uint64_t x) |
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{ |
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return ecb_popcount32 (x) + ecb_popcount32 (x >> 32); |
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} |
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|
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ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const; |
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ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const; |
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ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const; |
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ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const; |
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ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
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ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
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ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const; |
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ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const; |
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|
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ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); } |
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ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); } |
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ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); } |
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ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); } |
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ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } |
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ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } |
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ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } |
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ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } |
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|
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#if ECB_GCC_VERSION(4,3) |
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#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) |
| 323 |
#define ecb_bswap32(x) __builtin_bswap32 (x) |
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#define ecb_bswap64(x) __builtin_bswap64 (x) |
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#else |
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ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const; |
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ecb_function_ uint16_t |
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ecb_bswap16 (uint16_t x) |
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{ |
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return ecb_rotl16 (x, 8); |
| 331 |
} |
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|
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ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
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ecb_function_ uint32_t |
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ecb_bswap32 (uint32_t x) |
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{ |
| 337 |
return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16); |
| 338 |
} |
| 339 |
|
| 340 |
ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const; |
| 341 |
ecb_function_ uint64_t |
| 342 |
ecb_bswap64 (uint64_t x) |
| 343 |
{ |
| 344 |
return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32); |
| 345 |
} |
| 346 |
#endif |
| 347 |
|
| 348 |
#if ECB_GCC_VERSION(4,5) |
| 349 |
#define ecb_unreachable() __builtin_unreachable () |
| 350 |
#else |
| 351 |
/* this seems to work fine, but gcc always emits a warning for it :/ */ |
| 352 |
ecb_function_ void ecb_unreachable (void) ecb_noreturn; |
| 353 |
ecb_function_ void ecb_unreachable (void) { } |
| 354 |
#endif |
| 355 |
|
| 356 |
/* try to tell the compiler that some condition is definitely true */ |
| 357 |
#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
| 358 |
|
| 359 |
ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; |
| 360 |
ecb_function_ unsigned char |
| 361 |
ecb_byteorder_helper (void) |
| 362 |
{ |
| 363 |
const uint32_t u = 0x11223344; |
| 364 |
return *(unsigned char *)&u; |
| 365 |
} |
| 366 |
|
| 367 |
ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; |
| 368 |
ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
| 369 |
ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; |
| 370 |
ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
| 371 |
|
| 372 |
#if ECB_GCC_VERSION(3,0) || ECB_C99 |
| 373 |
#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
| 374 |
#else |
| 375 |
#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
| 376 |
#endif |
| 377 |
|
| 378 |
#if ecb_cplusplus_does_not_suck |
| 379 |
/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
| 380 |
template<typename T, int N> |
| 381 |
static inline int ecb_array_length (const T (&arr)[N]) |
| 382 |
{ |
| 383 |
return N; |
| 384 |
} |
| 385 |
#else |
| 386 |
#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
| 387 |
#endif |
| 388 |
|
| 389 |
#endif |
| 390 |
|
