--- libecb/ecb.h 2011/08/04 14:27:40 1.61 +++ libecb/ecb.h 2020/01/20 14:10:06 1.183 @@ -1,7 +1,7 @@ /* * libecb - http://software.schmorp.de/pkg/libecb * - * Copyright (©) 2009-2011 Marc Alexander Lehmann + * Copyright (©) 2009-2015 Marc Alexander Lehmann * Copyright (©) 2011 Emanuele Giaquinta * All rights reserved. * @@ -25,18 +25,38 @@ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Alternatively, the contents of this file may be used under the terms of + * the GNU General Public License ("GPL") version 2 or any later version, + * in which case the provisions of the GPL are applicable instead of + * the above. If you wish to allow the use of your version of this file + * only under the terms of the GPL and not to allow others to use your + * version of this file under the BSD license, indicate your decision + * by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL. If you do not delete the + * provisions above, a recipient may use your version of this file under + * either the BSD or the GPL. */ #ifndef ECB_H #define ECB_H +/* 16 bits major, 16 bits minor */ +#define ECB_VERSION 0x00010008 + #ifdef _WIN32 typedef signed char int8_t; typedef unsigned char uint8_t; + typedef signed char int_fast8_t; + typedef unsigned char uint_fast8_t; typedef signed short int16_t; typedef unsigned short uint16_t; + typedef signed int int_fast16_t; + typedef unsigned int uint_fast16_t; typedef signed int int32_t; typedef unsigned int uint32_t; + typedef signed int int_fast32_t; + typedef unsigned int uint_fast32_t; #if __GNUC__ typedef signed long long int64_t; typedef unsigned long long uint64_t; @@ -44,8 +64,44 @@ typedef signed __int64 int64_t; typedef unsigned __int64 uint64_t; #endif + typedef int64_t int_fast64_t; + typedef uint64_t uint_fast64_t; + #ifdef _WIN64 + #define ECB_PTRSIZE 8 + typedef uint64_t uintptr_t; + typedef int64_t intptr_t; + #else + #define ECB_PTRSIZE 4 + typedef uint32_t uintptr_t; + typedef int32_t intptr_t; + #endif #else #include + #if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU + #define ECB_PTRSIZE 8 + #else + #define ECB_PTRSIZE 4 + #endif +#endif + +#define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__) +#define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64) + +#ifndef ECB_OPTIMIZE_SIZE + #if __OPTIMIZE_SIZE__ + #define ECB_OPTIMIZE_SIZE 1 + #else + #define ECB_OPTIMIZE_SIZE 0 + #endif +#endif + +/* work around x32 idiocy by defining proper macros */ +#if ECB_GCC_AMD64 || ECB_MSVC_AMD64 + #if _ILP32 + #define ECB_AMD64_X32 1 + #else + #define ECB_AMD64 1 + #endif #endif /* many compilers define _GNUC_ to some versions but then only implement @@ -55,12 +111,51 @@ * we try to detect these and simply assume they are not gcc - if they have * an issue with that they should have done it right in the first place. */ -#ifndef ECB_GCC_VERSION - #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__) - #define ECB_GCC_VERSION(major,minor) 0 - #else - #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) - #endif +#if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__ + #define ECB_GCC_VERSION(major,minor) 0 +#else + #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) +#endif + +#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor))) + +#if __clang__ && defined __has_builtin + #define ECB_CLANG_BUILTIN(x) __has_builtin (x) +#else + #define ECB_CLANG_BUILTIN(x) 0 +#endif + +#if __clang__ && defined __has_extension + #define ECB_CLANG_EXTENSION(x) __has_extension (x) +#else + #define ECB_CLANG_EXTENSION(x) 0 +#endif + +#define ECB_CPP (__cplusplus+0) +#define ECB_CPP11 (__cplusplus >= 201103L) +#define ECB_CPP14 (__cplusplus >= 201402L) +#define ECB_CPP17 (__cplusplus >= 201703L) + +#if ECB_CPP + #define ECB_C 0 + #define ECB_STDC_VERSION 0 +#else + #define ECB_C 1 + #define ECB_STDC_VERSION __STDC_VERSION__ +#endif + +#define ECB_C99 (ECB_STDC_VERSION >= 199901L) +#define ECB_C11 (ECB_STDC_VERSION >= 201112L) +#define ECB_C17 (ECB_STDC_VERSION >= 201710L) + +#if ECB_CPP + #define ECB_EXTERN_C extern "C" + #define ECB_EXTERN_C_BEG ECB_EXTERN_C { + #define ECB_EXTERN_C_END } +#else + #define ECB_EXTERN_C extern + #define ECB_EXTERN_C_BEG + #define ECB_EXTERN_C_END #endif /*****************************************************************************/ @@ -68,67 +163,165 @@ /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ -#if ECB_NO_THREADS || ECB_NO_SMP - #define ECB_MEMORY_FENCE do { } while (0) - #define ECB_MEMORY_FENCE_ACQUIRE do { } while (0) - #define ECB_MEMORY_FENCE_RELEASE do { } while (0) +#if ECB_NO_THREADS + #define ECB_NO_SMP 1 +#endif + +#if ECB_NO_SMP + #define ECB_MEMORY_FENCE do { } while (0) +#endif + +/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */ +#if __xlC__ && ECB_CPP + #include +#endif + +#if 1400 <= _MSC_VER + #include /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */ #endif #ifndef ECB_MEMORY_FENCE - #if ECB_GCC_VERSION(2,5) - #if __x86 + #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 + #define ECB_MEMORY_FENCE_RELAXED __asm__ __volatile__ ("" : : : "memory") + #if __i386 || __i386__ #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") - #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ - #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ - #elif __amd64 - #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") - #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") - #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ + #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") + #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory") + #elif ECB_GCC_AMD64 + #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") + #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") + #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory") + #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ + #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") + #elif defined __ARM_ARCH_2__ \ + || defined __ARM_ARCH_3__ || defined __ARM_ARCH_3M__ \ + || defined __ARM_ARCH_4__ || defined __ARM_ARCH_4T__ \ + || defined __ARM_ARCH_5__ || defined __ARM_ARCH_5E__ \ + || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \ + || defined __ARM_ARCH_5TEJ__ + /* should not need any, unless running old code on newer cpu - arm doesn't support that */ + #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \ + || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \ + || defined __ARM_ARCH_6T2__ + #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") + #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ + || defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__ + #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") + #elif __aarch64__ + #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory") + #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8) + #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") + #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") + #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") + #elif defined __s390__ || defined __s390x__ + #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") + #elif defined __mips__ + /* GNU/Linux emulates sync on mips1 architectures, so we force its use */ + /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */ + #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory") + #elif defined __alpha__ + #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") + #elif defined __hppa__ + #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") + #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") + #elif defined __ia64__ + #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory") + #elif defined __m68k__ + #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") + #elif defined __m88k__ + #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory") + #elif defined __sh__ + #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") #endif #endif #endif #ifndef ECB_MEMORY_FENCE - #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) + #if ECB_GCC_VERSION(4,7) + /* see comment below (stdatomic.h) about the C11 memory model. */ + #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) + #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE) + #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE) + #define ECB_MEMORY_FENCE_RELAXED __atomic_thread_fence (__ATOMIC_RELAXED) + + #elif ECB_CLANG_EXTENSION(c_atomic) + /* see comment below (stdatomic.h) about the C11 memory model. */ + #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) + #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE) + #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE) + #define ECB_MEMORY_FENCE_RELAXED __c11_atomic_thread_fence (__ATOMIC_RELAXED) + + #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ #define ECB_MEMORY_FENCE __sync_synchronize () - #define ECB_MEMORY_FENCE_ACQUIRE __sync_synchronize () /* ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */ - #define ECB_MEMORY_FENCE_RELEASE __sync_synchronize () /* ({ char dummy = 1; __sync_lock_release (&dummy ); }) */ + #elif _MSC_VER >= 1500 /* VC++ 2008 */ + /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */ + #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) + #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier() + #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */ + #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier() #elif _MSC_VER >= 1400 /* VC++ 2005 */ #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) #define ECB_MEMORY_FENCE _ReadWriteBarrier () #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () - #elif defined(_WIN32) + #elif defined _WIN32 #include #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ - #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE - #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE + #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 + #include + #define ECB_MEMORY_FENCE __machine_rw_barrier () + #define ECB_MEMORY_FENCE_ACQUIRE __machine_acq_barrier () + #define ECB_MEMORY_FENCE_RELEASE __machine_rel_barrier () + #define ECB_MEMORY_FENCE_RELAXED __compiler_barrier () + #elif __xlC__ + #define ECB_MEMORY_FENCE __sync () + #endif +#endif + +#ifndef ECB_MEMORY_FENCE + #if ECB_C11 && !defined __STDC_NO_ATOMICS__ + /* we assume that these memory fences work on all variables/all memory accesses, */ + /* not just C11 atomics and atomic accesses */ + #include + #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst) + #define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire) + #define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release) #endif #endif #ifndef ECB_MEMORY_FENCE - /* - * if you get undefined symbol references to pthread_mutex_lock, - * or failure to find pthread.h, then you should implement - * the ECB_MEMORY_FENCE operations for your cpu/compiler - * OR provide pthread.h and link against the posix thread library - * of your system. - */ - #include - #define ECB_NEEDS_PTHREADS 1 - #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1 + #if !ECB_AVOID_PTHREADS + /* + * if you get undefined symbol references to pthread_mutex_lock, + * or failure to find pthread.h, then you should implement + * the ECB_MEMORY_FENCE operations for your cpu/compiler + * OR provide pthread.h and link against the posix thread library + * of your system. + */ + #include + #define ECB_NEEDS_PTHREADS 1 + #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1 + + static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; + #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) + #endif +#endif - static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; - #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) +#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE +#endif + +#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE #endif -/*****************************************************************************/ +#if !defined ECB_MEMORY_FENCE_RELAXED && defined ECB_MEMORY_FENCE + #define ECB_MEMORY_FENCE_RELAXED ECB_MEMORY_FENCE /* very heavy-handed */ +#endif -#define ECB_C99 (__STDC_VERSION__ >= 199901L) +/*****************************************************************************/ -#if __cplusplus +#if ECB_CPP #define ecb_inline static inline #elif ECB_GCC_VERSION(2,5) #define ecb_inline static __inline__ @@ -152,34 +345,83 @@ #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) #define ECB_STRINGIFY_(a) # a #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) +#define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr)) #define ecb_function_ ecb_inline -#if ECB_GCC_VERSION(3,1) - #define ecb_attribute(attrlist) __attribute__(attrlist) - #define ecb_is_constant(expr) __builtin_constant_p (expr) - #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) - #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) +#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8) + #define ecb_attribute(attrlist) __attribute__ (attrlist) #else #define ecb_attribute(attrlist) +#endif + +#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p) + #define ecb_is_constant(expr) __builtin_constant_p (expr) +#else + /* possible C11 impl for integral types + typedef struct ecb_is_constant_struct ecb_is_constant_struct; + #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */ + #define ecb_is_constant(expr) 0 +#endif + +#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect) + #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) +#else #define ecb_expect(expr,value) (expr) +#endif + +#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch) + #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) +#else #define ecb_prefetch(addr,rw,locality) #endif /* no emulation for ecb_decltype */ -#if ECB_GCC_VERSION(4,5) - #define ecb_decltype(x) __decltype(x) -#elif ECB_GCC_VERSION(3,0) - #define ecb_decltype(x) __typeof(x) +#if ECB_CPP11 + // older implementations might have problems with decltype(x)::type, work around it + template struct ecb_decltype_t { typedef T type; }; + #define ecb_decltype(x) ecb_decltype_t::type +#elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8) + #define ecb_decltype(x) __typeof__ (x) +#endif + +#if _MSC_VER >= 1300 + #define ecb_deprecated __declspec (deprecated) +#else + #define ecb_deprecated ecb_attribute ((__deprecated__)) +#endif + +#if _MSC_VER >= 1500 + #define ecb_deprecated_message(msg) __declspec (deprecated (msg)) +#elif ECB_GCC_VERSION(4,5) + #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg)) +#else + #define ecb_deprecated_message(msg) ecb_deprecated +#endif + +#if _MSC_VER >= 1400 + #define ecb_noinline __declspec (noinline) +#else + #define ecb_noinline ecb_attribute ((__noinline__)) #endif -#define ecb_noinline ecb_attribute ((__noinline__)) -#define ecb_noreturn ecb_attribute ((__noreturn__)) #define ecb_unused ecb_attribute ((__unused__)) #define ecb_const ecb_attribute ((__const__)) #define ecb_pure ecb_attribute ((__pure__)) +#if ECB_C11 || __IBMC_NORETURN + /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */ + #define ecb_noreturn _Noreturn +#elif ECB_CPP11 + #define ecb_noreturn [[noreturn]] +#elif _MSC_VER >= 1200 + /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */ + #define ecb_noreturn __declspec (noreturn) +#else + #define ecb_noreturn ecb_attribute ((__noreturn__)) +#endif + #if ECB_GCC_VERSION(4,3) #define ecb_artificial ecb_attribute ((__artificial__)) #define ecb_hot ecb_attribute ((__hot__)) @@ -200,7 +442,10 @@ #define ecb_unlikely(expr) ecb_expect_false (expr) /* count trailing zero bits and count # of one bits */ -#if ECB_GCC_VERSION(3,4) +#if ECB_GCC_VERSION(3,4) \ + || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \ + && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \ + && ECB_CLANG_BUILTIN(__builtin_popcount)) /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */ #define ecb_ld32(x) (__builtin_clz (x) ^ 31) #define ecb_ld64(x) (__builtin_clzll (x) ^ 63) @@ -209,10 +454,15 @@ #define ecb_popcount32(x) __builtin_popcount (x) /* no popcountll */ #else - ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; - ecb_function_ int + ecb_function_ ecb_const int ecb_ctz32 (uint32_t x); + ecb_function_ ecb_const int ecb_ctz32 (uint32_t x) { +#if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM) + unsigned long r; + _BitScanForward (&r, x); + return (int)r; +#else int r = 0; x &= ~x + 1; /* this isolates the lowest bit */ @@ -232,18 +482,25 @@ #endif return r; +#endif } - ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const; - ecb_function_ int + ecb_function_ ecb_const int ecb_ctz64 (uint64_t x); + ecb_function_ ecb_const int ecb_ctz64 (uint64_t x) { - int shift = x & 0xffffffffU ? 0 : 32; +#if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM) + unsigned long r; + _BitScanForward64 (&r, x); + return (int)r; +#else + int shift = x & 0xffffffff ? 0 : 32; return ecb_ctz32 (x >> shift) + shift; +#endif } - ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; - ecb_function_ int + ecb_function_ ecb_const int ecb_popcount32 (uint32_t x); + ecb_function_ ecb_const int ecb_popcount32 (uint32_t x) { x -= (x >> 1) & 0x55555555; @@ -254,9 +511,14 @@ return x >> 24; } - ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; - ecb_function_ int ecb_ld32 (uint32_t x) + ecb_function_ ecb_const int ecb_ld32 (uint32_t x); + ecb_function_ ecb_const int ecb_ld32 (uint32_t x) { +#if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM) + unsigned long r; + _BitScanReverse (&r, x); + return (int)r; +#else int r = 0; if (x >> 16) { x >>= 16; r += 16; } @@ -266,96 +528,277 @@ if (x >> 1) { r += 1; } return r; +#endif } - ecb_function_ int ecb_ld64 (uint64_t x) ecb_const; - ecb_function_ int ecb_ld64 (uint64_t x) + ecb_function_ ecb_const int ecb_ld64 (uint64_t x); + ecb_function_ ecb_const int ecb_ld64 (uint64_t x) { +#if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM) + unsigned long r; + _BitScanReverse64 (&r, x); + return (int)r; +#else int r = 0; if (x >> 32) { x >>= 32; r += 32; } return r + ecb_ld32 (x); +#endif } #endif +ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x); +ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); } +ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x); +ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); } + +ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x); +ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x) +{ + return ( (x * 0x0802U & 0x22110U) + | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16; +} + +ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x); +ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x) +{ + x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1); + x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2); + x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4); + x = ( x >> 8 ) | ( x << 8); + + return x; +} + +ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x); +ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x) +{ + x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1); + x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2); + x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4); + x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8); + x = ( x >> 16 ) | ( x << 16); + + return x; +} + /* popcount64 is only available on 64 bit cpus as gcc builtin */ /* so for this version we are lazy */ -ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; -ecb_function_ int +ecb_function_ ecb_const int ecb_popcount64 (uint64_t x); +ecb_function_ ecb_const int ecb_popcount64 (uint64_t x) { return ecb_popcount32 (x) + ecb_popcount32 (x >> 32); } -ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const; -ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const; -ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const; -ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const; -ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; -ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; -ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const; -ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const; - -ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); } -ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); } -ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); } -ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); } -ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } -ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } -ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } -ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } +ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count); +ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count); +ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count); +ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count); +ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count); +ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count); +ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count); +ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count); + +ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); } +ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); } +ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); } +ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); } +ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } +ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } +ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } +ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } + +#if ECB_CPP + +inline uint8_t ecb_ctz (uint8_t v) { return ecb_ctz32 (v); } +inline uint16_t ecb_ctz (uint16_t v) { return ecb_ctz32 (v); } +inline uint32_t ecb_ctz (uint32_t v) { return ecb_ctz32 (v); } +inline uint64_t ecb_ctz (uint64_t v) { return ecb_ctz64 (v); } + +inline bool ecb_is_pot (uint8_t v) { return ecb_is_pot32 (v); } +inline bool ecb_is_pot (uint16_t v) { return ecb_is_pot32 (v); } +inline bool ecb_is_pot (uint32_t v) { return ecb_is_pot32 (v); } +inline bool ecb_is_pot (uint64_t v) { return ecb_is_pot64 (v); } + +inline int ecb_ld (uint8_t v) { return ecb_ld32 (v); } +inline int ecb_ld (uint16_t v) { return ecb_ld32 (v); } +inline int ecb_ld (uint32_t v) { return ecb_ld32 (v); } +inline int ecb_ld (uint64_t v) { return ecb_ld64 (v); } + +inline int ecb_popcount (uint8_t v) { return ecb_popcount32 (v); } +inline int ecb_popcount (uint16_t v) { return ecb_popcount32 (v); } +inline int ecb_popcount (uint32_t v) { return ecb_popcount32 (v); } +inline int ecb_popcount (uint64_t v) { return ecb_popcount64 (v); } + +inline uint8_t ecb_bitrev (uint8_t v) { return ecb_bitrev8 (v); } +inline uint16_t ecb_bitrev (uint16_t v) { return ecb_bitrev16 (v); } +inline uint32_t ecb_bitrev (uint32_t v) { return ecb_bitrev32 (v); } + +inline uint8_t ecb_rotl (uint8_t v, unsigned int count) { return ecb_rotl8 (v, count); } +inline uint16_t ecb_rotl (uint16_t v, unsigned int count) { return ecb_rotl16 (v, count); } +inline uint32_t ecb_rotl (uint32_t v, unsigned int count) { return ecb_rotl32 (v, count); } +inline uint64_t ecb_rotl (uint64_t v, unsigned int count) { return ecb_rotl64 (v, count); } + +inline uint8_t ecb_rotr (uint8_t v, unsigned int count) { return ecb_rotr8 (v, count); } +inline uint16_t ecb_rotr (uint16_t v, unsigned int count) { return ecb_rotr16 (v, count); } +inline uint32_t ecb_rotr (uint32_t v, unsigned int count) { return ecb_rotr32 (v, count); } +inline uint64_t ecb_rotr (uint64_t v, unsigned int count) { return ecb_rotr64 (v, count); } -#if ECB_GCC_VERSION(4,3) +#endif + +#if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64)) + #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16) + #define ecb_bswap16(x) __builtin_bswap16 (x) + #else #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) + #endif #define ecb_bswap32(x) __builtin_bswap32 (x) #define ecb_bswap64(x) __builtin_bswap64 (x) +#elif _MSC_VER + #include + #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x))) + #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x))) + #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x))) #else - ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const; - ecb_function_ uint16_t + ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x); + ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x) { return ecb_rotl16 (x, 8); } - ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; - ecb_function_ uint32_t + ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x); + ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x) { return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16); } - ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const; - ecb_function_ uint64_t + ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x); + ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x) { return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32); } #endif -#if ECB_GCC_VERSION(4,5) +#if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable) #define ecb_unreachable() __builtin_unreachable () #else /* this seems to work fine, but gcc always emits a warning for it :/ */ - ecb_function_ void ecb_unreachable (void) ecb_noreturn; - ecb_function_ void ecb_unreachable (void) { } + ecb_inline ecb_noreturn void ecb_unreachable (void); + ecb_inline ecb_noreturn void ecb_unreachable (void) { } #endif /* try to tell the compiler that some condition is definitely true */ -#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) +#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0 -ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; -ecb_function_ unsigned char +ecb_inline ecb_const uint32_t ecb_byteorder_helper (void); +ecb_inline ecb_const uint32_t ecb_byteorder_helper (void) { - const uint32_t u = 0x11223344; - return *(unsigned char *)&u; + /* the union code still generates code under pressure in gcc, */ + /* but less than using pointers, and always seems to */ + /* successfully return a constant. */ + /* the reason why we have this horrible preprocessor mess */ + /* is to avoid it in all cases, at least on common architectures */ + /* or when using a recent enough gcc version (>= 4.6) */ +#if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \ + || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__) + #define ECB_LITTLE_ENDIAN 1 + return 0x44332211; +#elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \ + || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__) + #define ECB_BIG_ENDIAN 1 + return 0x11223344; +#else + union + { + uint8_t c[4]; + uint32_t u; + } u = { 0x11, 0x22, 0x33, 0x44 }; + return u.u; +#endif } -ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; -ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } -ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; -ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } +ecb_inline ecb_const ecb_bool ecb_big_endian (void); +ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; } +ecb_inline ecb_const ecb_bool ecb_little_endian (void); +ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; } + +/*****************************************************************************/ +/* unaligned load/store */ + +ecb_inline uint_fast16_t ecb_be_u16_to_host (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; } +ecb_inline uint_fast32_t ecb_be_u32_to_host (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; } +ecb_inline uint_fast64_t ecb_be_u64_to_host (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; } + +ecb_inline uint_fast16_t ecb_le_u16_to_host (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; } +ecb_inline uint_fast32_t ecb_le_u32_to_host (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; } +ecb_inline uint_fast64_t ecb_le_u64_to_host (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; } + +ecb_inline uint_fast16_t ecb_peek_u16_u (const void *ptr) { uint16_t v; memcpy (&v, ptr, sizeof (v)); return v; } +ecb_inline uint_fast32_t ecb_peek_u32_u (const void *ptr) { uint32_t v; memcpy (&v, ptr, sizeof (v)); return v; } +ecb_inline uint_fast64_t ecb_peek_u64_u (const void *ptr) { uint64_t v; memcpy (&v, ptr, sizeof (v)); return v; } + +ecb_inline uint_fast16_t ecb_peek_be_u16_u (const void *ptr) { return ecb_be_u16_to_host (ecb_peek_u16_u (ptr)); } +ecb_inline uint_fast32_t ecb_peek_be_u32_u (const void *ptr) { return ecb_be_u32_to_host (ecb_peek_u32_u (ptr)); } +ecb_inline uint_fast64_t ecb_peek_be_u64_u (const void *ptr) { return ecb_be_u64_to_host (ecb_peek_u64_u (ptr)); } + +ecb_inline uint_fast16_t ecb_peek_le_u16_u (const void *ptr) { return ecb_le_u16_to_host (ecb_peek_u16_u (ptr)); } +ecb_inline uint_fast32_t ecb_peek_le_u32_u (const void *ptr) { return ecb_le_u32_to_host (ecb_peek_u32_u (ptr)); } +ecb_inline uint_fast64_t ecb_peek_le_u64_u (const void *ptr) { return ecb_le_u64_to_host (ecb_peek_u64_u (ptr)); } + +ecb_inline uint_fast16_t ecb_host_to_be_u16 (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; } +ecb_inline uint_fast32_t ecb_host_to_be_u32 (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; } +ecb_inline uint_fast64_t ecb_host_to_be_u64 (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; } + +ecb_inline uint_fast16_t ecb_host_to_le_u16 (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; } +ecb_inline uint_fast32_t ecb_host_to_le_u32 (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; } +ecb_inline uint_fast64_t ecb_host_to_le_u64 (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; } + +ecb_inline void ecb_poke_u16_u (void *ptr, uint16_t v) { memcpy (ptr, &v, sizeof (v)); } +ecb_inline void ecb_poke_u32_u (void *ptr, uint32_t v) { memcpy (ptr, &v, sizeof (v)); } +ecb_inline void ecb_poke_u64_u (void *ptr, uint64_t v) { memcpy (ptr, &v, sizeof (v)); } + +ecb_inline void ecb_poke_be_u16_u (void *ptr, uint_fast16_t v) { ecb_poke_u16_u (ptr, ecb_host_to_be_u16 (v)); } +ecb_inline void ecb_poke_be_u32_u (void *ptr, uint_fast32_t v) { ecb_poke_u32_u (ptr, ecb_host_to_be_u32 (v)); } +ecb_inline void ecb_poke_be_u64_u (void *ptr, uint_fast64_t v) { ecb_poke_u64_u (ptr, ecb_host_to_be_u64 (v)); } + +ecb_inline void ecb_poke_le_u16_u (void *ptr, uint_fast16_t v) { ecb_poke_u16_u (ptr, ecb_host_to_le_u16 (v)); } +ecb_inline void ecb_poke_le_u32_u (void *ptr, uint_fast32_t v) { ecb_poke_u32_u (ptr, ecb_host_to_le_u32 (v)); } +ecb_inline void ecb_poke_le_u64_u (void *ptr, uint_fast64_t v) { ecb_poke_u64_u (ptr, ecb_host_to_le_u64 (v)); } + +#ifdef ECB_CPP + +inline uint8_t ecb_bswap (uint8_t v) { return v; } +inline uint16_t ecb_bswap (uint16_t v) { return ecb_bswap16 (v); } +inline uint32_t ecb_bswap (uint32_t v) { return ecb_bswap32 (v); } +inline uint64_t ecb_bswap (uint64_t v) { return ecb_bswap64 (v); } + +template inline T ecb_be_to_host (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; } +template inline T ecb_le_to_host (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; } +template inline T ecb_peek (const void *ptr) { return *(const T *)ptr; } +template inline T ecb_peek_be (const void *ptr) { return ecb_be_to_host (ecb_peek (ptr)); } +template inline T ecb_peek_le (const void *ptr) { return ecb_le_to_host (ecb_peek (ptr)); } +template inline T ecb_peek_u (const void *ptr) { T v; std::memcpy (&v, ptr, sizeof (v)); return v; } +template inline T ecb_peek_be_u (const void *ptr) { return ecb_be_to_host (ecb_peek_u (ptr)); } +template inline T ecb_peek_le_u (const void *ptr) { return ecb_le_to_host (ecb_peek_u (ptr)); } + +template inline T ecb_host_to_be (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; } +template inline T ecb_host_to_le (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; } +template inline void ecb_poke (void *ptr, T v) { *(T *)ptr = v; } +template inline void ecb_poke_be (void *ptr, T v) { return ecb_poke (ptr, ecb_host_to_be (v)); } +template inline void ecb_poke_le (void *ptr, T v) { return ecb_poke (ptr, ecb_host_to_le (v)); } +template inline void ecb_poke_u (void *ptr, T v) { std::memcpy (ptr, &v, sizeof (v)); } +template inline void ecb_poke_be_u (void *ptr, T v) { return ecb_poke_u (ptr, ecb_host_to_be (v)); } +template inline void ecb_poke_le_u (void *ptr, T v) { return ecb_poke_u (ptr, ecb_host_to_le (v)); } + +#endif + +/*****************************************************************************/ #if ECB_GCC_VERSION(3,0) || ECB_C99 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) @@ -363,6 +806,22 @@ #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) #endif +#if ECB_CPP + template + static inline T ecb_div_rd (T val, T div) + { + return val < 0 ? - ((-val + div - 1) / div) : (val ) / div; + } + template + static inline T ecb_div_ru (T val, T div) + { + return val < 0 ? - ((-val ) / div) : (val + div - 1) / div; + } +#else + #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div)) + #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div)) +#endif + #if ecb_cplusplus_does_not_suck /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ template @@ -374,5 +833,312 @@ #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) #endif +/*****************************************************************************/ + +ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x); +ecb_function_ ecb_const uint32_t +ecb_binary16_to_binary32 (uint32_t x) +{ + unsigned int s = (x & 0x8000) << (31 - 15); + int e = (x >> 10) & 0x001f; + unsigned int m = x & 0x03ff; + + if (ecb_expect_false (e == 31)) + /* infinity or NaN */ + e = 255 - (127 - 15); + else if (ecb_expect_false (!e)) + { + if (ecb_expect_true (!m)) + /* zero, handled by code below by forcing e to 0 */ + e = 0 - (127 - 15); + else + { + /* subnormal, renormalise */ + unsigned int s = 10 - ecb_ld32 (m); + + m = (m << s) & 0x3ff; /* mask implicit bit */ + e -= s - 1; + } + } + + /* e and m now are normalised, or zero, (or inf or nan) */ + e += 127 - 15; + + return s | (e << 23) | (m << (23 - 10)); +} + +ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x); +ecb_function_ ecb_const uint16_t +ecb_binary32_to_binary16 (uint32_t x) +{ + unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */ + unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */ + unsigned int m = x & 0x007fffff; + + x &= 0x7fffffff; + + /* if it's within range of binary16 normals, use fast path */ + if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff)) + { + /* mantissa round-to-even */ + m += 0x00000fff + ((m >> (23 - 10)) & 1); + + /* handle overflow */ + if (ecb_expect_false (m >= 0x00800000)) + { + m >>= 1; + e += 1; + } + + return s | (e << 10) | (m >> (23 - 10)); + } + + /* handle large numbers and infinity */ + if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000)) + return s | 0x7c00; + + /* handle zero, subnormals and small numbers */ + if (ecb_expect_true (x < 0x38800000)) + { + /* zero */ + if (ecb_expect_true (!x)) + return s; + + /* handle subnormals */ + + /* too small, will be zero */ + if (e < (14 - 24)) /* might not be sharp, but is good enough */ + return s; + + m |= 0x00800000; /* make implicit bit explicit */ + + /* very tricky - we need to round to the nearest e (+10) bit value */ + { + unsigned int bits = 14 - e; + unsigned int half = (1 << (bits - 1)) - 1; + unsigned int even = (m >> bits) & 1; + + /* if this overflows, we will end up with a normalised number */ + m = (m + half + even) >> bits; + } + + return s | m; + } + + /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */ + m >>= 13; + + return s | 0x7c00 | m | !m; +} + +/*******************************************************************************/ +/* floating point stuff, can be disabled by defining ECB_NO_LIBM */ + +/* basically, everything uses "ieee pure-endian" floating point numbers */ +/* the only noteworthy exception is ancient armle, which uses order 43218765 */ +#if 0 \ + || __i386 || __i386__ \ + || ECB_GCC_AMD64 \ + || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \ + || defined __s390__ || defined __s390x__ \ + || defined __mips__ \ + || defined __alpha__ \ + || defined __hppa__ \ + || defined __ia64__ \ + || defined __m68k__ \ + || defined __m88k__ \ + || defined __sh__ \ + || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \ + || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \ + || defined __aarch64__ + #define ECB_STDFP 1 + #include /* for memcpy */ +#else + #define ECB_STDFP 0 +#endif + +#ifndef ECB_NO_LIBM + + #include /* for frexp*, ldexp*, INFINITY, NAN */ + + /* only the oldest of old doesn't have this one. solaris. */ + #ifdef INFINITY + #define ECB_INFINITY INFINITY + #else + #define ECB_INFINITY HUGE_VAL + #endif + + #ifdef NAN + #define ECB_NAN NAN + #else + #define ECB_NAN ECB_INFINITY + #endif + + #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L + #define ecb_ldexpf(x,e) ldexpf ((x), (e)) + #define ecb_frexpf(x,e) frexpf ((x), (e)) + #else + #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e)) + #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e)) + #endif + + /* convert a float to ieee single/binary32 */ + ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x); + ecb_function_ ecb_const uint32_t + ecb_float_to_binary32 (float x) + { + uint32_t r; + + #if ECB_STDFP + memcpy (&r, &x, 4); + #else + /* slow emulation, works for anything but -0 */ + uint32_t m; + int e; + + if (x == 0e0f ) return 0x00000000U; + if (x > +3.40282346638528860e+38f) return 0x7f800000U; + if (x < -3.40282346638528860e+38f) return 0xff800000U; + if (x != x ) return 0x7fbfffffU; + + m = ecb_frexpf (x, &e) * 0x1000000U; + + r = m & 0x80000000U; + + if (r) + m = -m; + + if (e <= -126) + { + m &= 0xffffffU; + m >>= (-125 - e); + e = -126; + } + + r |= (e + 126) << 23; + r |= m & 0x7fffffU; + #endif + + return r; + } + + /* converts an ieee single/binary32 to a float */ + ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x); + ecb_function_ ecb_const float + ecb_binary32_to_float (uint32_t x) + { + float r; + + #if ECB_STDFP + memcpy (&r, &x, 4); + #else + /* emulation, only works for normals and subnormals and +0 */ + int neg = x >> 31; + int e = (x >> 23) & 0xffU; + + x &= 0x7fffffU; + + if (e) + x |= 0x800000U; + else + e = 1; + + /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */ + r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126); + + r = neg ? -r : r; + #endif + + return r; + } + + /* convert a double to ieee double/binary64 */ + ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x); + ecb_function_ ecb_const uint64_t + ecb_double_to_binary64 (double x) + { + uint64_t r; + + #if ECB_STDFP + memcpy (&r, &x, 8); + #else + /* slow emulation, works for anything but -0 */ + uint64_t m; + int e; + + if (x == 0e0 ) return 0x0000000000000000U; + if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U; + if (x < -1.79769313486231470e+308) return 0xfff0000000000000U; + if (x != x ) return 0X7ff7ffffffffffffU; + + m = frexp (x, &e) * 0x20000000000000U; + + r = m & 0x8000000000000000;; + + if (r) + m = -m; + + if (e <= -1022) + { + m &= 0x1fffffffffffffU; + m >>= (-1021 - e); + e = -1022; + } + + r |= ((uint64_t)(e + 1022)) << 52; + r |= m & 0xfffffffffffffU; + #endif + + return r; + } + + /* converts an ieee double/binary64 to a double */ + ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x); + ecb_function_ ecb_const double + ecb_binary64_to_double (uint64_t x) + { + double r; + + #if ECB_STDFP + memcpy (&r, &x, 8); + #else + /* emulation, only works for normals and subnormals and +0 */ + int neg = x >> 63; + int e = (x >> 52) & 0x7ffU; + + x &= 0xfffffffffffffU; + + if (e) + x |= 0x10000000000000U; + else + e = 1; + + /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */ + r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022); + + r = neg ? -r : r; + #endif + + return r; + } + + /* convert a float to ieee half/binary16 */ + ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x); + ecb_function_ ecb_const uint16_t + ecb_float_to_binary16 (float x) + { + return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x)); + } + + /* convert an ieee half/binary16 to float */ + ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x); + ecb_function_ ecb_const float + ecb_binary16_to_float (uint16_t x) + { + return ecb_binary32_to_float (ecb_binary16_to_binary32 (x)); + } + +#endif + #endif