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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 0x00010002 |
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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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#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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#if ECB_CPP |
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#define ECB_EXTERN_C extern "C" |
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#define ECB_EXTERN_C_BEG ECB_EXTERN_C { |
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#define ECB_EXTERN_C_END } |
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#else |
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#define ECB_EXTERN_C extern |
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#define ECB_EXTERN_C_BEG |
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#define ECB_EXTERN_C_END |
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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 |
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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 (stdatomic.h) about the C11 memory model. */ |
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#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) |
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|
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/* The __has_feature syntax from clang is so misdesigned that we cannot use it |
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* without risking compile time errors with other compilers. We *could* |
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* define our own ecb_clang_has_feature, but I just can't be bothered to work |
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* around * this shit time and again. |
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* #elif defined __clang && __has_feature (cxx_atomic) |
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* // see comment below (stdatomic.h) about the C11 memory model. |
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* #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) |
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*/ |
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|
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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, neither gcc 4.7 nor clang 3.1 generate any instructions for */ |
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/* any fence other than seq_cst, which isn't very efficient for us. */ |
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/* Why that is, we don't know - either the C11 memory model is quite useless */ |
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/* for most usages, or gcc and clang have a bug */ |
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/* I *currently* lean towards the latter, and inefficiently implement */ |
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/* all three of ecb's fences as a seq_cst fence */ |
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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) |
| 298 |
/* 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 */ |
| 303 |
#if ECB_GCC_VERSION(3,4) |
| 304 |
/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */ |
| 305 |
#define ecb_ld32(x) (__builtin_clz (x) ^ 31) |
| 306 |
#define ecb_ld64(x) (__builtin_clzll (x) ^ 63) |
| 307 |
#define ecb_ctz32(x) __builtin_ctz (x) |
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#define ecb_ctz64(x) __builtin_ctzll (x) |
| 309 |
#define ecb_popcount32(x) __builtin_popcount (x) |
| 310 |
/* no popcountll */ |
| 311 |
#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; |
| 322 |
r += !!(x & 0xcccccccc) << 1; |
| 323 |
r += !!(x & 0xf0f0f0f0) << 2; |
| 324 |
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; |
| 328 |
if (x & 0xcccccccc) r += 2; |
| 329 |
if (x & 0xf0f0f0f0) r += 4; |
| 330 |
if (x & 0xff00ff00) r += 8; |
| 331 |
if (x & 0xffff0000) r += 16; |
| 332 |
#endif |
| 333 |
|
| 334 |
return r; |
| 335 |
} |
| 336 |
|
| 337 |
ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const; |
| 338 |
ecb_function_ int |
| 339 |
ecb_ctz64 (uint64_t x) |
| 340 |
{ |
| 341 |
int shift = x & 0xffffffffU ? 0 : 32; |
| 342 |
return ecb_ctz32 (x >> shift) + shift; |
| 343 |
} |
| 344 |
|
| 345 |
ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
| 346 |
ecb_function_ int |
| 347 |
ecb_popcount32 (uint32_t x) |
| 348 |
{ |
| 349 |
x -= (x >> 1) & 0x55555555; |
| 350 |
x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
| 351 |
x = ((x >> 4) + x) & 0x0f0f0f0f; |
| 352 |
x *= 0x01010101; |
| 353 |
|
| 354 |
return x >> 24; |
| 355 |
} |
| 356 |
|
| 357 |
ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; |
| 358 |
ecb_function_ int ecb_ld32 (uint32_t x) |
| 359 |
{ |
| 360 |
int r = 0; |
| 361 |
|
| 362 |
if (x >> 16) { x >>= 16; r += 16; } |
| 363 |
if (x >> 8) { x >>= 8; r += 8; } |
| 364 |
if (x >> 4) { x >>= 4; r += 4; } |
| 365 |
if (x >> 2) { x >>= 2; r += 2; } |
| 366 |
if (x >> 1) { r += 1; } |
| 367 |
|
| 368 |
return r; |
| 369 |
} |
| 370 |
|
| 371 |
ecb_function_ int ecb_ld64 (uint64_t x) ecb_const; |
| 372 |
ecb_function_ int ecb_ld64 (uint64_t x) |
| 373 |
{ |
| 374 |
int r = 0; |
| 375 |
|
| 376 |
if (x >> 32) { x >>= 32; r += 32; } |
| 377 |
|
| 378 |
return r + ecb_ld32 (x); |
| 379 |
} |
| 380 |
#endif |
| 381 |
|
| 382 |
ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const; |
| 383 |
ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); } |
| 384 |
ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const; |
| 385 |
ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); } |
| 386 |
|
| 387 |
ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const; |
| 388 |
ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) |
| 389 |
{ |
| 390 |
return ( (x * 0x0802U & 0x22110U) |
| 391 |
| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16; |
| 392 |
} |
| 393 |
|
| 394 |
ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const; |
| 395 |
ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) |
| 396 |
{ |
| 397 |
x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1); |
| 398 |
x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2); |
| 399 |
x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4); |
| 400 |
x = ( x >> 8 ) | ( x << 8); |
| 401 |
|
| 402 |
return x; |
| 403 |
} |
| 404 |
|
| 405 |
ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const; |
| 406 |
ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) |
| 407 |
{ |
| 408 |
x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1); |
| 409 |
x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2); |
| 410 |
x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4); |
| 411 |
x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8); |
| 412 |
x = ( x >> 16 ) | ( x << 16); |
| 413 |
|
| 414 |
return x; |
| 415 |
} |
| 416 |
|
| 417 |
/* popcount64 is only available on 64 bit cpus as gcc builtin */ |
| 418 |
/* so for this version we are lazy */ |
| 419 |
ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; |
| 420 |
ecb_function_ int |
| 421 |
ecb_popcount64 (uint64_t x) |
| 422 |
{ |
| 423 |
return ecb_popcount32 (x) + ecb_popcount32 (x >> 32); |
| 424 |
} |
| 425 |
|
| 426 |
ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const; |
| 427 |
ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const; |
| 428 |
ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const; |
| 429 |
ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const; |
| 430 |
ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
| 431 |
ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
| 432 |
ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const; |
| 433 |
ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const; |
| 434 |
|
| 435 |
ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); } |
| 436 |
ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); } |
| 437 |
ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); } |
| 438 |
ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); } |
| 439 |
ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } |
| 440 |
ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } |
| 441 |
ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } |
| 442 |
ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } |
| 443 |
|
| 444 |
#if ECB_GCC_VERSION(4,3) |
| 445 |
#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) |
| 446 |
#define ecb_bswap32(x) __builtin_bswap32 (x) |
| 447 |
#define ecb_bswap64(x) __builtin_bswap64 (x) |
| 448 |
#else |
| 449 |
ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const; |
| 450 |
ecb_function_ uint16_t |
| 451 |
ecb_bswap16 (uint16_t x) |
| 452 |
{ |
| 453 |
return ecb_rotl16 (x, 8); |
| 454 |
} |
| 455 |
|
| 456 |
ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
| 457 |
ecb_function_ uint32_t |
| 458 |
ecb_bswap32 (uint32_t x) |
| 459 |
{ |
| 460 |
return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16); |
| 461 |
} |
| 462 |
|
| 463 |
ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const; |
| 464 |
ecb_function_ uint64_t |
| 465 |
ecb_bswap64 (uint64_t x) |
| 466 |
{ |
| 467 |
return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32); |
| 468 |
} |
| 469 |
#endif |
| 470 |
|
| 471 |
#if ECB_GCC_VERSION(4,5) |
| 472 |
#define ecb_unreachable() __builtin_unreachable () |
| 473 |
#else |
| 474 |
/* this seems to work fine, but gcc always emits a warning for it :/ */ |
| 475 |
ecb_inline void ecb_unreachable (void) ecb_noreturn; |
| 476 |
ecb_inline void ecb_unreachable (void) { } |
| 477 |
#endif |
| 478 |
|
| 479 |
/* try to tell the compiler that some condition is definitely true */ |
| 480 |
#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0 |
| 481 |
|
| 482 |
ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; |
| 483 |
ecb_inline unsigned char |
| 484 |
ecb_byteorder_helper (void) |
| 485 |
{ |
| 486 |
/* the union code still generates code under pressure in gcc, */ |
| 487 |
/* but less than using pointers, and always seem to */ |
| 488 |
/* successfully return a constant. */ |
| 489 |
/* the reason why we have this horrible preprocessor mess */ |
| 490 |
/* is to avoid it in all cases, at least on common architectures */ |
| 491 |
/* and yes, gcc defines __BYTE_ORDER__, g++ does not */ |
| 492 |
#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64 |
| 493 |
return 0x44; |
| 494 |
#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
| 495 |
return 0x44; |
| 496 |
#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
| 497 |
retrurn 0x11; |
| 498 |
#else |
| 499 |
union |
| 500 |
{ |
| 501 |
uint32_t i; |
| 502 |
uint8_t c; |
| 503 |
} u = { 0x11223344 }; |
| 504 |
return u.c; |
| 505 |
#endif |
| 506 |
} |
| 507 |
|
| 508 |
ecb_inline ecb_bool ecb_big_endian (void) ecb_const; |
| 509 |
ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
| 510 |
ecb_inline ecb_bool ecb_little_endian (void) ecb_const; |
| 511 |
ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
| 512 |
|
| 513 |
#if ECB_GCC_VERSION(3,0) || ECB_C99 |
| 514 |
#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
| 515 |
#else |
| 516 |
#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
| 517 |
#endif |
| 518 |
|
| 519 |
#if __cplusplus |
| 520 |
template<typename T> |
| 521 |
static inline T ecb_div_rd (T val, T div) |
| 522 |
{ |
| 523 |
return val < 0 ? - ((-val + div - 1) / div) : (val ) / div; |
| 524 |
} |
| 525 |
template<typename T> |
| 526 |
static inline T ecb_div_ru (T val, T div) |
| 527 |
{ |
| 528 |
return val < 0 ? - ((-val ) / div) : (val + div - 1) / div; |
| 529 |
} |
| 530 |
#else |
| 531 |
#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div)) |
| 532 |
#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div)) |
| 533 |
#endif |
| 534 |
|
| 535 |
#if ecb_cplusplus_does_not_suck |
| 536 |
/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
| 537 |
template<typename T, int N> |
| 538 |
static inline int ecb_array_length (const T (&arr)[N]) |
| 539 |
{ |
| 540 |
return N; |
| 541 |
} |
| 542 |
#else |
| 543 |
#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
| 544 |
#endif |
| 545 |
|
| 546 |
/*******************************************************************************/ |
| 547 |
/* floating point stuff, can be disabled by defining ECB_NO_LIBM */ |
| 548 |
|
| 549 |
/* basically, everything uses "ieee pure-endian" floating point numbers */ |
| 550 |
/* the only noteworthy exception is ancient armle, which uses order 43218765 */ |
| 551 |
#if 0 \ |
| 552 |
|| __i386 || __i386__ \ |
| 553 |
|| __amd64 || __amd64__ || __x86_64 || __x86_64__ \ |
| 554 |
|| __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \ |
| 555 |
|| defined __arm__ && defined __ARM_EABI__ \ |
| 556 |
|| defined __s390__ || defined __s390x__ \ |
| 557 |
|| defined __mips__ \ |
| 558 |
|| defined __alpha__ \ |
| 559 |
|| defined __hppa__ \ |
| 560 |
|| defined __ia64__ \ |
| 561 |
|| defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 |
| 562 |
#define ECB_STDFP 1 |
| 563 |
#include <string.h> /* for memcpy */ |
| 564 |
#else |
| 565 |
#define ECB_STDFP 0 |
| 566 |
#include <math.h> /* for frexp*, ldexp* */ |
| 567 |
#endif |
| 568 |
|
| 569 |
#ifndef ECB_NO_LIBM |
| 570 |
|
| 571 |
/* convert a float to ieee single/binary32 */ |
| 572 |
ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const; |
| 573 |
ecb_function_ uint32_t |
| 574 |
ecb_float_to_binary32 (float x) |
| 575 |
{ |
| 576 |
uint32_t r; |
| 577 |
|
| 578 |
#if ECB_STDFP |
| 579 |
memcpy (&r, &x, 4); |
| 580 |
#else |
| 581 |
/* slow emulation, works for anything but -0 */ |
| 582 |
uint32_t m; |
| 583 |
int e; |
| 584 |
|
| 585 |
if (x == 0e0f ) return 0x00000000U; |
| 586 |
if (x > +3.40282346638528860e+38f) return 0x7f800000U; |
| 587 |
if (x < -3.40282346638528860e+38f) return 0xff800000U; |
| 588 |
if (x != x ) return 0x7fbfffffU; |
| 589 |
|
| 590 |
m = frexpf (x, &e) * 0x1000000U; |
| 591 |
|
| 592 |
r = m & 0x80000000U; |
| 593 |
|
| 594 |
if (r) |
| 595 |
m = -m; |
| 596 |
|
| 597 |
if (e <= -126) |
| 598 |
{ |
| 599 |
m &= 0xffffffU; |
| 600 |
m >>= (-125 - e); |
| 601 |
e = -126; |
| 602 |
} |
| 603 |
|
| 604 |
r |= (e + 126) << 23; |
| 605 |
r |= m & 0x7fffffU; |
| 606 |
#endif |
| 607 |
|
| 608 |
return r; |
| 609 |
} |
| 610 |
|
| 611 |
/* converts an ieee single/binary32 to a float */ |
| 612 |
ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const; |
| 613 |
ecb_function_ float |
| 614 |
ecb_binary32_to_float (uint32_t x) |
| 615 |
{ |
| 616 |
float r; |
| 617 |
|
| 618 |
#if ECB_STDFP |
| 619 |
memcpy (&r, &x, 4); |
| 620 |
#else |
| 621 |
/* emulation, only works for normals and subnormals and +0 */ |
| 622 |
int neg = x >> 31; |
| 623 |
int e = (x >> 23) & 0xffU; |
| 624 |
|
| 625 |
x &= 0x7fffffU; |
| 626 |
|
| 627 |
if (e) |
| 628 |
x |= 0x800000U; |
| 629 |
else |
| 630 |
e = 1; |
| 631 |
|
| 632 |
/* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */ |
| 633 |
r = ldexpf (x * (0.5f / 0x800000U), e - 126); |
| 634 |
|
| 635 |
r = neg ? -r : r; |
| 636 |
#endif |
| 637 |
|
| 638 |
return r; |
| 639 |
} |
| 640 |
|
| 641 |
/* convert a double to ieee double/binary64 */ |
| 642 |
ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const; |
| 643 |
ecb_function_ uint64_t |
| 644 |
ecb_double_to_binary64 (double x) |
| 645 |
{ |
| 646 |
uint64_t r; |
| 647 |
|
| 648 |
#if ECB_STDFP |
| 649 |
memcpy (&r, &x, 8); |
| 650 |
#else |
| 651 |
/* slow emulation, works for anything but -0 */ |
| 652 |
uint64_t m; |
| 653 |
int e; |
| 654 |
|
| 655 |
if (x == 0e0 ) return 0x0000000000000000U; |
| 656 |
if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U; |
| 657 |
if (x < -1.79769313486231470e+308) return 0xfff0000000000000U; |
| 658 |
if (x != x ) return 0X7ff7ffffffffffffU; |
| 659 |
|
| 660 |
m = frexp (x, &e) * 0x20000000000000U; |
| 661 |
|
| 662 |
r = m & 0x8000000000000000;; |
| 663 |
|
| 664 |
if (r) |
| 665 |
m = -m; |
| 666 |
|
| 667 |
if (e <= -1022) |
| 668 |
{ |
| 669 |
m &= 0x1fffffffffffffU; |
| 670 |
m >>= (-1021 - e); |
| 671 |
e = -1022; |
| 672 |
} |
| 673 |
|
| 674 |
r |= ((uint64_t)(e + 1022)) << 52; |
| 675 |
r |= m & 0xfffffffffffffU; |
| 676 |
#endif |
| 677 |
|
| 678 |
return r; |
| 679 |
} |
| 680 |
|
| 681 |
/* converts an ieee double/binary64 to a double */ |
| 682 |
ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const; |
| 683 |
ecb_function_ double |
| 684 |
ecb_binary64_to_double (uint64_t x) |
| 685 |
{ |
| 686 |
double r; |
| 687 |
|
| 688 |
#if ECB_STDFP |
| 689 |
memcpy (&r, &x, 8); |
| 690 |
#else |
| 691 |
/* emulation, only works for normals and subnormals and +0 */ |
| 692 |
int neg = x >> 63; |
| 693 |
int e = (x >> 52) & 0x7ffU; |
| 694 |
|
| 695 |
x &= 0xfffffffffffffU; |
| 696 |
|
| 697 |
if (e) |
| 698 |
x |= 0x10000000000000U; |
| 699 |
else |
| 700 |
e = 1; |
| 701 |
|
| 702 |
/* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */ |
| 703 |
r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022); |
| 704 |
|
| 705 |
r = neg ? -r : r; |
| 706 |
#endif |
| 707 |
|
| 708 |
return r; |
| 709 |
} |
| 710 |
|
| 711 |
#endif |
| 712 |
|
| 713 |
#endif |
| 714 |
|
