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Comparing libeio/ecb.h (file contents):
Revision 1.23 by root, Wed Feb 11 19:32:36 2015 UTC vs.
Revision 1.29 by root, Fri Aug 23 07:20:21 2019 UTC

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40 40
41#ifndef ECB_H 41#ifndef ECB_H
42#define ECB_H 42#define ECB_H
43 43
44/* 16 bits major, 16 bits minor */ 44/* 16 bits major, 16 bits minor */
45#define ECB_VERSION 0x00010004 45#define ECB_VERSION 0x00010006
46 46
47#ifdef _WIN32 47#ifdef _WIN32
48 typedef signed char int8_t; 48 typedef signed char int8_t;
49 typedef unsigned char uint8_t; 49 typedef unsigned char uint8_t;
50 typedef signed short int16_t; 50 typedef signed short int16_t;
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67 typedef uint32_t uintptr_t; 67 typedef uint32_t uintptr_t;
68 typedef int32_t intptr_t; 68 typedef int32_t intptr_t;
69 #endif 69 #endif
70#else 70#else
71 #include <inttypes.h> 71 #include <inttypes.h>
72 #if UINTMAX_MAX > 0xffffffffU 72 #if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU
73 #define ECB_PTRSIZE 8 73 #define ECB_PTRSIZE 8
74 #else 74 #else
75 #define ECB_PTRSIZE 4 75 #define ECB_PTRSIZE 4
76 #endif 76 #endif
77#endif 77#endif
78 78
79#define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)
80#define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64)
81
79/* work around x32 idiocy by defining proper macros */ 82/* work around x32 idiocy by defining proper macros */
80#if __amd64 || __x86_64 || _M_AMD64 || _M_X64 83#if ECB_GCC_AMD64 || ECB_MSVC_AMD64
81 #if _ILP32 84 #if _ILP32
82 #define ECB_AMD64_X32 1 85 #define ECB_AMD64_X32 1
83 #else 86 #else
84 #define ECB_AMD64 1 87 #define ECB_AMD64 1
85 #endif 88 #endif
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112 #define ECB_CLANG_EXTENSION(x) 0 115 #define ECB_CLANG_EXTENSION(x) 0
113#endif 116#endif
114 117
115#define ECB_CPP (__cplusplus+0) 118#define ECB_CPP (__cplusplus+0)
116#define ECB_CPP11 (__cplusplus >= 201103L) 119#define ECB_CPP11 (__cplusplus >= 201103L)
120#define ECB_CPP14 (__cplusplus >= 201402L)
121#define ECB_CPP17 (__cplusplus >= 201703L)
117 122
118#if ECB_CPP 123#if ECB_CPP
119 #define ECB_C 0 124 #define ECB_C 0
120 #define ECB_STDC_VERSION 0 125 #define ECB_STDC_VERSION 0
121#else 126#else
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123 #define ECB_STDC_VERSION __STDC_VERSION__ 128 #define ECB_STDC_VERSION __STDC_VERSION__
124#endif 129#endif
125 130
126#define ECB_C99 (ECB_STDC_VERSION >= 199901L) 131#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
127#define ECB_C11 (ECB_STDC_VERSION >= 201112L) 132#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
133#define ECB_C17 (ECB_STDC_VERSION >= 201710L)
128 134
129#if ECB_CPP 135#if ECB_CPP
130 #define ECB_EXTERN_C extern "C" 136 #define ECB_EXTERN_C extern "C"
131 #define ECB_EXTERN_C_BEG ECB_EXTERN_C { 137 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
132 #define ECB_EXTERN_C_END } 138 #define ECB_EXTERN_C_END }
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147 153
148#if ECB_NO_SMP 154#if ECB_NO_SMP
149 #define ECB_MEMORY_FENCE do { } while (0) 155 #define ECB_MEMORY_FENCE do { } while (0)
150#endif 156#endif
151 157
158/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
159#if __xlC__ && ECB_CPP
160 #include <builtins.h>
161#endif
162
163#if 1400 <= _MSC_VER
164 #include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
165#endif
166
152#ifndef ECB_MEMORY_FENCE 167#ifndef ECB_MEMORY_FENCE
153 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 168 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
169 #define ECB_MEMORY_FENCE_RELAXED __asm__ __volatile__ ("" : : : "memory")
154 #if __i386 || __i386__ 170 #if __i386 || __i386__
155 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") 171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
156 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") 172 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
157 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") 173 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
158 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__ 174 #elif ECB_GCC_AMD64
159 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 175 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
160 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") 176 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
161 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") 177 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
162 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ 178 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
163 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 179 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
180 #elif defined __ARM_ARCH_2__ \
181 || defined __ARM_ARCH_3__ || defined __ARM_ARCH_3M__ \
182 || defined __ARM_ARCH_4__ || defined __ARM_ARCH_4T__ \
183 || defined __ARM_ARCH_5__ || defined __ARM_ARCH_5E__ \
184 || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \
185 || defined __ARM_ARCH_5TEJ__
186 /* should not need any, unless running old code on newer cpu - arm doesn't support that */
164 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \ 187 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
165 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ 188 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
189 || defined __ARM_ARCH_6T2__
166 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") 190 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
167 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ 191 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
168 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ 192 || defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
169 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") 193 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
170 #elif __aarch64__ 194 #elif __aarch64__
171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory") 195 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
172 #elif (__sparc || __sparc__) && !__sparcv8 196 #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
173 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") 197 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
174 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") 198 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
175 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") 199 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
176 #elif defined __s390__ || defined __s390x__ 200 #elif defined __s390__ || defined __s390x__
177 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") 201 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
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200 #if ECB_GCC_VERSION(4,7) 224 #if ECB_GCC_VERSION(4,7)
201 /* see comment below (stdatomic.h) about the C11 memory model. */ 225 /* see comment below (stdatomic.h) about the C11 memory model. */
202 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) 226 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
203 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE) 227 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
204 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE) 228 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
229 #define ECB_MEMORY_FENCE_RELAXED __atomic_thread_fence (__ATOMIC_RELAXED)
205 230
206 #elif ECB_CLANG_EXTENSION(c_atomic) 231 #elif ECB_CLANG_EXTENSION(c_atomic)
207 /* see comment below (stdatomic.h) about the C11 memory model. */ 232 /* see comment below (stdatomic.h) about the C11 memory model. */
208 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) 233 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
209 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE) 234 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
210 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE) 235 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
236 #define ECB_MEMORY_FENCE_RELAXED __c11_atomic_thread_fence (__ATOMIC_RELAXED)
211 237
212 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ 238 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
213 #define ECB_MEMORY_FENCE __sync_synchronize () 239 #define ECB_MEMORY_FENCE __sync_synchronize ()
214 #elif _MSC_VER >= 1500 /* VC++ 2008 */ 240 #elif _MSC_VER >= 1500 /* VC++ 2008 */
215 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */ 241 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
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225 #elif defined _WIN32 251 #elif defined _WIN32
226 #include <WinNT.h> 252 #include <WinNT.h>
227 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ 253 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
228 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 254 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
229 #include <mbarrier.h> 255 #include <mbarrier.h>
230 #define ECB_MEMORY_FENCE __machine_rw_barrier () 256 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
231 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier () 257 #define ECB_MEMORY_FENCE_ACQUIRE __machine_acq_barrier ()
232 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier () 258 #define ECB_MEMORY_FENCE_RELEASE __machine_rel_barrier ()
259 #define ECB_MEMORY_FENCE_RELAXED __compiler_barrier ()
233 #elif __xlC__ 260 #elif __xlC__
234 #define ECB_MEMORY_FENCE __sync () 261 #define ECB_MEMORY_FENCE __sync ()
235 #endif 262 #endif
236#endif 263#endif
237 264
238#ifndef ECB_MEMORY_FENCE 265#ifndef ECB_MEMORY_FENCE
239 #if ECB_C11 && !defined __STDC_NO_ATOMICS__ 266 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
240 /* we assume that these memory fences work on all variables/all memory accesses, */ 267 /* we assume that these memory fences work on all variables/all memory accesses, */
241 /* not just C11 atomics and atomic accesses */ 268 /* not just C11 atomics and atomic accesses */
242 #include <stdatomic.h> 269 #include <stdatomic.h>
243 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
244 /* any fence other than seq_cst, which isn't very efficient for us. */
245 /* Why that is, we don't know - either the C11 memory model is quite useless */
246 /* for most usages, or gcc and clang have a bug */
247 /* I *currently* lean towards the latter, and inefficiently implement */
248 /* all three of ecb's fences as a seq_cst fence */
249 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
250 /* for all __atomic_thread_fence's except seq_cst */
251 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst) 270 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
271 #define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
272 #define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
252 #endif 273 #endif
253#endif 274#endif
254 275
255#ifndef ECB_MEMORY_FENCE 276#ifndef ECB_MEMORY_FENCE
256 #if !ECB_AVOID_PTHREADS 277 #if !ECB_AVOID_PTHREADS
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276 297
277#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE 298#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
278 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 299 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
279#endif 300#endif
280 301
302#if !defined ECB_MEMORY_FENCE_RELAXED && defined ECB_MEMORY_FENCE
303 #define ECB_MEMORY_FENCE_RELAXED ECB_MEMORY_FENCE /* very heavy-handed */
304#endif
305
281/*****************************************************************************/ 306/*****************************************************************************/
282 307
283#if ECB_CPP 308#if ECB_CPP
284 #define ecb_inline static inline 309 #define ecb_inline static inline
285#elif ECB_GCC_VERSION(2,5) 310#elif ECB_GCC_VERSION(2,5)
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302 327
303#define ECB_CONCAT_(a, b) a ## b 328#define ECB_CONCAT_(a, b) a ## b
304#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 329#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
305#define ECB_STRINGIFY_(a) # a 330#define ECB_STRINGIFY_(a) # a
306#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 331#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
332#define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
307 333
308#define ecb_function_ ecb_inline 334#define ecb_function_ ecb_inline
309 335
310#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8) 336#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
311 #define ecb_attribute(attrlist) __attribute__ (attrlist) 337 #define ecb_attribute(attrlist) __attribute__ (attrlist)
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348 #define ecb_deprecated __declspec (deprecated) 374 #define ecb_deprecated __declspec (deprecated)
349#else 375#else
350 #define ecb_deprecated ecb_attribute ((__deprecated__)) 376 #define ecb_deprecated ecb_attribute ((__deprecated__))
351#endif 377#endif
352 378
379#if _MSC_VER >= 1500
380 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
381#elif ECB_GCC_VERSION(4,5)
382 #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
383#else
384 #define ecb_deprecated_message(msg) ecb_deprecated
385#endif
386
387#if _MSC_VER >= 1400
388 #define ecb_noinline __declspec (noinline)
389#else
353#define ecb_noinline ecb_attribute ((__noinline__)) 390 #define ecb_noinline ecb_attribute ((__noinline__))
391#endif
392
354#define ecb_unused ecb_attribute ((__unused__)) 393#define ecb_unused ecb_attribute ((__unused__))
355#define ecb_const ecb_attribute ((__const__)) 394#define ecb_const ecb_attribute ((__const__))
356#define ecb_pure ecb_attribute ((__pure__)) 395#define ecb_pure ecb_attribute ((__pure__))
357 396
358/* TODO http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx __declspec(noreturn) */
359#if ECB_C11 || __IBMC_NORETURN 397#if ECB_C11 || __IBMC_NORETURN
360 /* http://pic.dhe.ibm.com/infocenter/compbg/v121v141/topic/com.ibm.xlcpp121.bg.doc/language_ref/noreturn.html */ 398 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
361 #define ecb_noreturn _Noreturn 399 #define ecb_noreturn _Noreturn
400#elif ECB_CPP11
401 #define ecb_noreturn [[noreturn]]
402#elif _MSC_VER >= 1200
403 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
404 #define ecb_noreturn __declspec (noreturn)
362#else 405#else
363 #define ecb_noreturn ecb_attribute ((__noreturn__)) 406 #define ecb_noreturn ecb_attribute ((__noreturn__))
364#endif 407#endif
365 408
366#if ECB_GCC_VERSION(4,3) 409#if ECB_GCC_VERSION(4,3)
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397#else 440#else
398 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x); 441 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
399 ecb_function_ ecb_const int 442 ecb_function_ ecb_const int
400 ecb_ctz32 (uint32_t x) 443 ecb_ctz32 (uint32_t x)
401 { 444 {
445#if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
446 unsigned long r;
447 _BitScanForward (&r, x);
448 return (int)r;
449#else
402 int r = 0; 450 int r = 0;
403 451
404 x &= ~x + 1; /* this isolates the lowest bit */ 452 x &= ~x + 1; /* this isolates the lowest bit */
405 453
406#if ECB_branchless_on_i386 454#if ECB_branchless_on_i386
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416 if (x & 0xff00ff00) r += 8; 464 if (x & 0xff00ff00) r += 8;
417 if (x & 0xffff0000) r += 16; 465 if (x & 0xffff0000) r += 16;
418#endif 466#endif
419 467
420 return r; 468 return r;
469#endif
421 } 470 }
422 471
423 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x); 472 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
424 ecb_function_ ecb_const int 473 ecb_function_ ecb_const int
425 ecb_ctz64 (uint64_t x) 474 ecb_ctz64 (uint64_t x)
426 { 475 {
476#if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
477 unsigned long r;
478 _BitScanForward64 (&r, x);
479 return (int)r;
480#else
427 int shift = x & 0xffffffffU ? 0 : 32; 481 int shift = x & 0xffffffff ? 0 : 32;
428 return ecb_ctz32 (x >> shift) + shift; 482 return ecb_ctz32 (x >> shift) + shift;
483#endif
429 } 484 }
430 485
431 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x); 486 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
432 ecb_function_ ecb_const int 487 ecb_function_ ecb_const int
433 ecb_popcount32 (uint32_t x) 488 ecb_popcount32 (uint32_t x)
… …
441 } 496 }
442 497
443 ecb_function_ ecb_const int ecb_ld32 (uint32_t x); 498 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
444 ecb_function_ ecb_const int ecb_ld32 (uint32_t x) 499 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
445 { 500 {
501#if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
502 unsigned long r;
503 _BitScanReverse (&r, x);
504 return (int)r;
505#else
446 int r = 0; 506 int r = 0;
447 507
448 if (x >> 16) { x >>= 16; r += 16; } 508 if (x >> 16) { x >>= 16; r += 16; }
449 if (x >> 8) { x >>= 8; r += 8; } 509 if (x >> 8) { x >>= 8; r += 8; }
450 if (x >> 4) { x >>= 4; r += 4; } 510 if (x >> 4) { x >>= 4; r += 4; }
451 if (x >> 2) { x >>= 2; r += 2; } 511 if (x >> 2) { x >>= 2; r += 2; }
452 if (x >> 1) { r += 1; } 512 if (x >> 1) { r += 1; }
453 513
454 return r; 514 return r;
515#endif
455 } 516 }
456 517
457 ecb_function_ ecb_const int ecb_ld64 (uint64_t x); 518 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
458 ecb_function_ ecb_const int ecb_ld64 (uint64_t x) 519 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
459 { 520 {
521#if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
522 unsigned long r;
523 _BitScanReverse64 (&r, x);
524 return (int)r;
525#else
460 int r = 0; 526 int r = 0;
461 527
462 if (x >> 32) { x >>= 32; r += 32; } 528 if (x >> 32) { x >>= 32; r += 32; }
463 529
464 return r + ecb_ld32 (x); 530 return r + ecb_ld32 (x);
531#endif
465 } 532 }
466#endif 533#endif
467 534
468ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x); 535ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
469ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); } 536ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
… …
526ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } 593ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
527ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } 594ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
528ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } 595ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
529 596
530#if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64)) 597#if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
598 #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
599 #define ecb_bswap16(x) __builtin_bswap16 (x)
600 #else
531 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) 601 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
602 #endif
532 #define ecb_bswap32(x) __builtin_bswap32 (x) 603 #define ecb_bswap32(x) __builtin_bswap32 (x)
533 #define ecb_bswap64(x) __builtin_bswap64 (x) 604 #define ecb_bswap64(x) __builtin_bswap64 (x)
605#elif _MSC_VER
606 #include <stdlib.h>
607 #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
608 #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
609 #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
534#else 610#else
535 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x); 611 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
536 ecb_function_ ecb_const uint16_t 612 ecb_function_ ecb_const uint16_t
537 ecb_bswap16 (uint16_t x) 613 ecb_bswap16 (uint16_t x)
538 { 614 {
… …
563#endif 639#endif
564 640
565/* try to tell the compiler that some condition is definitely true */ 641/* try to tell the compiler that some condition is definitely true */
566#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0 642#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
567 643
568ecb_inline ecb_const unsigned char ecb_byteorder_helper (void); 644ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
569ecb_inline ecb_const unsigned char 645ecb_inline ecb_const uint32_t
570ecb_byteorder_helper (void) 646ecb_byteorder_helper (void)
571{ 647{
572 /* the union code still generates code under pressure in gcc, */ 648 /* the union code still generates code under pressure in gcc, */
573 /* but less than using pointers, and always seems to */ 649 /* but less than using pointers, and always seems to */
574 /* successfully return a constant. */ 650 /* successfully return a constant. */
575 /* the reason why we have this horrible preprocessor mess */ 651 /* the reason why we have this horrible preprocessor mess */
576 /* is to avoid it in all cases, at least on common architectures */ 652 /* is to avoid it in all cases, at least on common architectures */
577 /* or when using a recent enough gcc version (>= 4.6) */ 653 /* or when using a recent enough gcc version (>= 4.6) */
578#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
579 return 0x44;
580#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 654#if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
655 || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
656 #define ECB_LITTLE_ENDIAN 1
581 return 0x44; 657 return 0x44332211;
582#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 658#elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
659 || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
660 #define ECB_BIG_ENDIAN 1
583 return 0x11; 661 return 0x11223344;
584#else 662#else
585 union 663 union
586 { 664 {
665 uint8_t c[4];
587 uint32_t i; 666 uint32_t u;
588 uint8_t c;
589 } u = { 0x11223344 }; 667 } u = { 0x11, 0x22, 0x33, 0x44 };
590 return u.c; 668 return u.u;
591#endif 669#endif
592} 670}
593 671
594ecb_inline ecb_const ecb_bool ecb_big_endian (void); 672ecb_inline ecb_const ecb_bool ecb_big_endian (void);
595ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } 673ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
596ecb_inline ecb_const ecb_bool ecb_little_endian (void); 674ecb_inline ecb_const ecb_bool ecb_little_endian (void);
597ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } 675ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
598 676
599#if ECB_GCC_VERSION(3,0) || ECB_C99 677#if ECB_GCC_VERSION(3,0) || ECB_C99
600 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 678 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
601#else 679#else
602 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 680 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
… …
627 } 705 }
628#else 706#else
629 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 707 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
630#endif 708#endif
631 709
710ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
711ecb_function_ ecb_const uint32_t
712ecb_binary16_to_binary32 (uint32_t x)
713{
714 unsigned int s = (x & 0x8000) << (31 - 15);
715 int e = (x >> 10) & 0x001f;
716 unsigned int m = x & 0x03ff;
717
718 if (ecb_expect_false (e == 31))
719 /* infinity or NaN */
720 e = 255 - (127 - 15);
721 else if (ecb_expect_false (!e))
722 {
723 if (ecb_expect_true (!m))
724 /* zero, handled by code below by forcing e to 0 */
725 e = 0 - (127 - 15);
726 else
727 {
728 /* subnormal, renormalise */
729 unsigned int s = 10 - ecb_ld32 (m);
730
731 m = (m << s) & 0x3ff; /* mask implicit bit */
732 e -= s - 1;
733 }
734 }
735
736 /* e and m now are normalised, or zero, (or inf or nan) */
737 e += 127 - 15;
738
739 return s | (e << 23) | (m << (23 - 10));
740}
741
742ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
743ecb_function_ ecb_const uint16_t
744ecb_binary32_to_binary16 (uint32_t x)
745{
746 unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
747 unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
748 unsigned int m = x & 0x007fffff;
749
750 x &= 0x7fffffff;
751
752 /* if it's within range of binary16 normals, use fast path */
753 if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
754 {
755 /* mantissa round-to-even */
756 m += 0x00000fff + ((m >> (23 - 10)) & 1);
757
758 /* handle overflow */
759 if (ecb_expect_false (m >= 0x00800000))
760 {
761 m >>= 1;
762 e += 1;
763 }
764
765 return s | (e << 10) | (m >> (23 - 10));
766 }
767
768 /* handle large numbers and infinity */
769 if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
770 return s | 0x7c00;
771
772 /* handle zero, subnormals and small numbers */
773 if (ecb_expect_true (x < 0x38800000))
774 {
775 /* zero */
776 if (ecb_expect_true (!x))
777 return s;
778
779 /* handle subnormals */
780
781 /* too small, will be zero */
782 if (e < (14 - 24)) /* might not be sharp, but is good enough */
783 return s;
784
785 m |= 0x00800000; /* make implicit bit explicit */
786
787 /* very tricky - we need to round to the nearest e (+10) bit value */
788 {
789 unsigned int bits = 14 - e;
790 unsigned int half = (1 << (bits - 1)) - 1;
791 unsigned int even = (m >> bits) & 1;
792
793 /* if this overflows, we will end up with a normalised number */
794 m = (m + half + even) >> bits;
795 }
796
797 return s | m;
798 }
799
800 /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
801 m >>= 13;
802
803 return s | 0x7c00 | m | !m;
804}
805
632/*******************************************************************************/ 806/*******************************************************************************/
633/* floating point stuff, can be disabled by defining ECB_NO_LIBM */ 807/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
634 808
635/* basically, everything uses "ieee pure-endian" floating point numbers */ 809/* basically, everything uses "ieee pure-endian" floating point numbers */
636/* the only noteworthy exception is ancient armle, which uses order 43218765 */ 810/* the only noteworthy exception is ancient armle, which uses order 43218765 */
637#if 0 \ 811#if 0 \
638 || __i386 || __i386__ \ 812 || __i386 || __i386__ \
639 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \ 813 || ECB_GCC_AMD64 \
640 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \ 814 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
641 || defined __s390__ || defined __s390x__ \ 815 || defined __s390__ || defined __s390x__ \
642 || defined __mips__ \ 816 || defined __mips__ \
643 || defined __alpha__ \ 817 || defined __alpha__ \
644 || defined __hppa__ \ 818 || defined __hppa__ \
645 || defined __ia64__ \ 819 || defined __ia64__ \
646 || defined __m68k__ \ 820 || defined __m68k__ \
647 || defined __m88k__ \ 821 || defined __m88k__ \
648 || defined __sh__ \ 822 || defined __sh__ \
649 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 \ 823 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
650 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \ 824 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
651 || defined __aarch64__ 825 || defined __aarch64__
652 #define ECB_STDFP 1 826 #define ECB_STDFP 1
653 #include <string.h> /* for memcpy */ 827 #include <string.h> /* for memcpy */
654#else 828#else
… …
672 #define ECB_NAN ECB_INFINITY 846 #define ECB_NAN ECB_INFINITY
673 #endif 847 #endif
674 848
675 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L 849 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
676 #define ecb_ldexpf(x,e) ldexpf ((x), (e)) 850 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
851 #define ecb_frexpf(x,e) frexpf ((x), (e))
677 #else 852 #else
678 #define ecb_ldexpf(x,e) (float) ldexp ((x), (e)) 853 #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
854 #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
679 #endif 855 #endif
680
681 /* converts an ieee half/binary16 to a float */
682 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
683 ecb_function_ ecb_const float
684 ecb_binary16_to_float (uint16_t x)
685 {
686 int e = (x >> 10) & 0x1f;
687 int m = x & 0x3ff;
688 float r;
689
690 if (!e ) r = ecb_ldexpf (m , -24);
691 else if (e != 31) r = ecb_ldexpf (m + 0x400, e - 25);
692 else if (m ) r = ECB_NAN;
693 else r = ECB_INFINITY;
694
695 return x & 0x8000 ? -r : r;
696 }
697 856
698 /* convert a float to ieee single/binary32 */ 857 /* convert a float to ieee single/binary32 */
699 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x); 858 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
700 ecb_function_ ecb_const uint32_t 859 ecb_function_ ecb_const uint32_t
701 ecb_float_to_binary32 (float x) 860 ecb_float_to_binary32 (float x)
… …
712 if (x == 0e0f ) return 0x00000000U; 871 if (x == 0e0f ) return 0x00000000U;
713 if (x > +3.40282346638528860e+38f) return 0x7f800000U; 872 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
714 if (x < -3.40282346638528860e+38f) return 0xff800000U; 873 if (x < -3.40282346638528860e+38f) return 0xff800000U;
715 if (x != x ) return 0x7fbfffffU; 874 if (x != x ) return 0x7fbfffffU;
716 875
717 m = frexpf (x, &e) * 0x1000000U; 876 m = ecb_frexpf (x, &e) * 0x1000000U;
718 877
719 r = m & 0x80000000U; 878 r = m & 0x80000000U;
720 879
721 if (r) 880 if (r)
722 m = -m; 881 m = -m;
… …
833 #endif 992 #endif
834 993
835 return r; 994 return r;
836 } 995 }
837 996
838#endif 997 /* convert a float to ieee half/binary16 */
998 ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
999 ecb_function_ ecb_const uint16_t
1000 ecb_float_to_binary16 (float x)
1001 {
1002 return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
1003 }
839 1004
840#endif 1005 /* convert an ieee half/binary16 to float */
1006 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
1007 ecb_function_ ecb_const float
1008 ecb_binary16_to_float (uint16_t x)
1009 {
1010 return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
1011 }
841 1012
1013#endif
1014
1015#endif
1016

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