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/* |
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* libecb - http://software.schmorp.de/pkg/libecb |
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* |
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* Copyright (©) 2009-2012 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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/* 16 bits major, 16 bits minor */ |
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#define ECB_VERSION 0x00010001 |
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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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#ifdef _WIN64 |
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#define ECB_PTRSIZE 8 |
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typedef uint64_t uintptr_t; |
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typedef int64_t intptr_t; |
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#else |
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#define ECB_PTRSIZE 4 |
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typedef uint32_t uintptr_t; |
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typedef int32_t intptr_t; |
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#endif |
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typedef intptr_t ptrdiff_t; |
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#else |
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#include <inttypes.h> |
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#if UINTMAX_MAX > 0xffffffffU |
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#define ECB_PTRSIZE 8 |
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#else |
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#define ECB_PTRSIZE 4 |
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#endif |
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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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#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */ |
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#define ECB_C99 (__STDC_VERSION__ >= 199901L) |
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#define ECB_C11 (__STDC_VERSION__ >= 201112L) |
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#define ECB_CPP (__cplusplus+0) |
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#define ECB_CPP11 (__cplusplus >= 201103L) |
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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 |
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#define ECB_NO_SMP 1 |
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#endif |
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|
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#if 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) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
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#if __i386 || __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 __asm__ __volatile__ ("" : : : "memory") |
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#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
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#elif __amd64 || __amd64__ || __x86_64 || __x86_64__ |
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#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") |
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#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") |
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#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
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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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#elif __sparc || __sparc__ |
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#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") |
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#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") |
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#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") |
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#elif defined __s390__ || defined __s390x__ |
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#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") |
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#elif defined __mips__ |
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#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") |
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#elif defined __alpha__ |
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#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") |
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#elif defined __hppa__ |
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#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
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#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
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#elif defined __ia64__ |
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#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "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(4,7) |
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/* see comment below about the C11 memory model. in short - avoid */ |
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#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) |
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#elif defined __clang && __has_feature (cxx_atomic) |
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/* see above */ |
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#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) |
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#elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ |
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#define ECB_MEMORY_FENCE __sync_synchronize () |
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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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#elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
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#include <mbarrier.h> |
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#define ECB_MEMORY_FENCE __machine_rw_barrier () |
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#define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier () |
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#define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier () |
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#elif __xlC__ |
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#define ECB_MEMORY_FENCE __sync () |
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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_C11 && !defined __STDC_NO_ATOMICS__ |
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/* we assume that these memory fences work on all variables/all memory accesses, */ |
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/* not just C11 atomics and atomic accesses */ |
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#include <stdatomic.h> |
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/* unfortunately, the C11 memory model seems to be very limited, and unable to express */ |
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/* simple barrier semantics. That means we need to take out thor's hammer. */ |
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#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst) |
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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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#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_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_C11 |
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#define ecb_noreturn _Noreturn |
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#else |
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#define ecb_noreturn ecb_attribute ((__noreturn__)) |
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#endif |
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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; |
| 302 |
r += !!(x & 0xcccccccc) << 1; |
| 303 |
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 |
| 319 |
ecb_ctz64 (uint64_t x) |
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{ |
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int shift = x & 0xffffffffU ? 0 : 32; |
| 322 |
return ecb_ctz32 (x >> shift) + shift; |
| 323 |
} |
| 324 |
|
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ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
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ecb_function_ int |
| 327 |
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); |
| 331 |
x = ((x >> 4) + x) & 0x0f0f0f0f; |
| 332 |
x *= 0x01010101; |
| 333 |
|
| 334 |
return x >> 24; |
| 335 |
} |
| 336 |
|
| 337 |
ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; |
| 338 |
ecb_function_ int ecb_ld32 (uint32_t x) |
| 339 |
{ |
| 340 |
int r = 0; |
| 341 |
|
| 342 |
if (x >> 16) { x >>= 16; r += 16; } |
| 343 |
if (x >> 8) { x >>= 8; r += 8; } |
| 344 |
if (x >> 4) { x >>= 4; r += 4; } |
| 345 |
if (x >> 2) { x >>= 2; r += 2; } |
| 346 |
if (x >> 1) { r += 1; } |
| 347 |
|
| 348 |
return r; |
| 349 |
} |
| 350 |
|
| 351 |
ecb_function_ int ecb_ld64 (uint64_t x) ecb_const; |
| 352 |
ecb_function_ int ecb_ld64 (uint64_t x) |
| 353 |
{ |
| 354 |
int r = 0; |
| 355 |
|
| 356 |
if (x >> 32) { x >>= 32; r += 32; } |
| 357 |
|
| 358 |
return r + ecb_ld32 (x); |
| 359 |
} |
| 360 |
#endif |
| 361 |
|
| 362 |
ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const; |
| 363 |
ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); } |
| 364 |
ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const; |
| 365 |
ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); } |
| 366 |
|
| 367 |
ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const; |
| 368 |
ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) |
| 369 |
{ |
| 370 |
return ( (x * 0x0802U & 0x22110U) |
| 371 |
| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16; |
| 372 |
} |
| 373 |
|
| 374 |
ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const; |
| 375 |
ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) |
| 376 |
{ |
| 377 |
x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1); |
| 378 |
x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2); |
| 379 |
x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4); |
| 380 |
x = ( x >> 8 ) | ( x << 8); |
| 381 |
|
| 382 |
return x; |
| 383 |
} |
| 384 |
|
| 385 |
ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const; |
| 386 |
ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) |
| 387 |
{ |
| 388 |
x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1); |
| 389 |
x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2); |
| 390 |
x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4); |
| 391 |
x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8); |
| 392 |
x = ( x >> 16 ) | ( x << 16); |
| 393 |
|
| 394 |
return x; |
| 395 |
} |
| 396 |
|
| 397 |
/* popcount64 is only available on 64 bit cpus as gcc builtin */ |
| 398 |
/* so for this version we are lazy */ |
| 399 |
ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; |
| 400 |
ecb_function_ int |
| 401 |
ecb_popcount64 (uint64_t x) |
| 402 |
{ |
| 403 |
return ecb_popcount32 (x) + ecb_popcount32 (x >> 32); |
| 404 |
} |
| 405 |
|
| 406 |
ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const; |
| 407 |
ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const; |
| 408 |
ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const; |
| 409 |
ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const; |
| 410 |
ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
| 411 |
ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
| 412 |
ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const; |
| 413 |
ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const; |
| 414 |
|
| 415 |
ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); } |
| 416 |
ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); } |
| 417 |
ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); } |
| 418 |
ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); } |
| 419 |
ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } |
| 420 |
ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } |
| 421 |
ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } |
| 422 |
ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } |
| 423 |
|
| 424 |
#if ECB_GCC_VERSION(4,3) |
| 425 |
#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) |
| 426 |
#define ecb_bswap32(x) __builtin_bswap32 (x) |
| 427 |
#define ecb_bswap64(x) __builtin_bswap64 (x) |
| 428 |
#else |
| 429 |
ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const; |
| 430 |
ecb_function_ uint16_t |
| 431 |
ecb_bswap16 (uint16_t x) |
| 432 |
{ |
| 433 |
return ecb_rotl16 (x, 8); |
| 434 |
} |
| 435 |
|
| 436 |
ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
| 437 |
ecb_function_ uint32_t |
| 438 |
ecb_bswap32 (uint32_t x) |
| 439 |
{ |
| 440 |
return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16); |
| 441 |
} |
| 442 |
|
| 443 |
ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const; |
| 444 |
ecb_function_ uint64_t |
| 445 |
ecb_bswap64 (uint64_t x) |
| 446 |
{ |
| 447 |
return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32); |
| 448 |
} |
| 449 |
#endif |
| 450 |
|
| 451 |
#if ECB_GCC_VERSION(4,5) |
| 452 |
#define ecb_unreachable() __builtin_unreachable () |
| 453 |
#else |
| 454 |
/* this seems to work fine, but gcc always emits a warning for it :/ */ |
| 455 |
ecb_inline void ecb_unreachable (void) ecb_noreturn; |
| 456 |
ecb_inline void ecb_unreachable (void) { } |
| 457 |
#endif |
| 458 |
|
| 459 |
/* try to tell the compiler that some condition is definitely true */ |
| 460 |
#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
| 461 |
|
| 462 |
ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; |
| 463 |
ecb_inline unsigned char |
| 464 |
ecb_byteorder_helper (void) |
| 465 |
{ |
| 466 |
const uint32_t u = 0x11223344; |
| 467 |
return *(unsigned char *)&u; |
| 468 |
} |
| 469 |
|
| 470 |
ecb_inline ecb_bool ecb_big_endian (void) ecb_const; |
| 471 |
ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
| 472 |
ecb_inline ecb_bool ecb_little_endian (void) ecb_const; |
| 473 |
ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
| 474 |
|
| 475 |
#if ECB_GCC_VERSION(3,0) || ECB_C99 |
| 476 |
#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
| 477 |
#else |
| 478 |
#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
| 479 |
#endif |
| 480 |
|
| 481 |
#if __cplusplus |
| 482 |
template<typename T> |
| 483 |
static inline T ecb_div_rd (T val, T div) |
| 484 |
{ |
| 485 |
return val < 0 ? - ((-val + div - 1) / div) : (val ) / div; |
| 486 |
} |
| 487 |
template<typename T> |
| 488 |
static inline T ecb_div_ru (T val, T div) |
| 489 |
{ |
| 490 |
return val < 0 ? - ((-val ) / div) : (val + div - 1) / div; |
| 491 |
} |
| 492 |
#else |
| 493 |
#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div)) |
| 494 |
#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div)) |
| 495 |
#endif |
| 496 |
|
| 497 |
#if ecb_cplusplus_does_not_suck |
| 498 |
/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
| 499 |
template<typename T, int N> |
| 500 |
static inline int ecb_array_length (const T (&arr)[N]) |
| 501 |
{ |
| 502 |
return N; |
| 503 |
} |
| 504 |
#else |
| 505 |
#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
| 506 |
#endif |
| 507 |
|
| 508 |
#endif |
| 509 |
|
