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Comparing libeio/ecb.h (file contents):
Revision 1.18 by root, Sat Sep 7 23:18:23 2013 UTC vs.
Revision 1.19 by root, Fri Jan 24 23:46:17 2014 UTC

1/* 1/*
2 * libecb - http://software.schmorp.de/pkg/libecb 2 * libecb - http://software.schmorp.de/pkg/libecb
3 * 3 *
4 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de> 4 * Copyright (©) 2009-2013 Marc Alexander Lehmann <libecb@schmorp.de>
5 * Copyright (©) 2011 Emanuele Giaquinta 5 * Copyright (©) 2011 Emanuele Giaquinta
6 * All rights reserved. 6 * All rights reserved.
7 * 7 *
8 * Redistribution and use in source and binary forms, with or without modifica- 8 * Redistribution and use in source and binary forms, with or without modifica-
9 * tion, are permitted provided that the following conditions are met: 9 * tion, are permitted provided that the following conditions are met:
… …
64 #define ECB_PTRSIZE 4 64 #define ECB_PTRSIZE 4
65 #endif 65 #endif
66#endif 66#endif
67 67
68/* work around x32 idiocy by defining proper macros */ 68/* work around x32 idiocy by defining proper macros */
69#if __x86_64 || _M_AMD64 69#if __amd64 || __x86_64 || _M_AMD64 || _M_X64
70 #if __ILP32 70 #if _ILP32
71 #define ECB_AMD64_X32 1 71 #define ECB_AMD64_X32 1
72 #else 72 #else
73 #define ECB_AMD64 1 73 #define ECB_AMD64 1
74 #endif 74 #endif
75#endif 75#endif
… …
87 #else 87 #else
88 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 88 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
89 #endif 89 #endif
90#endif 90#endif
91 91
92#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
93#define ECB_C99 (__STDC_VERSION__ >= 199901L)
94#define ECB_C11 (__STDC_VERSION__ >= 201112L)
95#define ECB_CPP (__cplusplus+0) 92#define ECB_CPP (__cplusplus+0)
96#define ECB_CPP11 (__cplusplus >= 201103L) 93#define ECB_CPP11 (__cplusplus >= 201103L)
94
95#if ECB_CPP
96 #define ECB_C 0
97 #define ECB_STDC_VERSION 0
98#else
99 #define ECB_C 1
100 #define ECB_STDC_VERSION __STDC_VERSION__
101#endif
102
103#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
104#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
97 105
98#if ECB_CPP 106#if ECB_CPP
99 #define ECB_EXTERN_C extern "C" 107 #define ECB_EXTERN_C extern "C"
100 #define ECB_EXTERN_C_BEG ECB_EXTERN_C { 108 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
101 #define ECB_EXTERN_C_END } 109 #define ECB_EXTERN_C_END }
… …
134 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ 142 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
135 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") 143 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
136 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ 144 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
137 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ 145 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
138 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") 146 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
139 #elif __sparc || __sparc__ 147 #elif (__sparc || __sparc__) && !__sparcv8
140 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") 148 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
141 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") 149 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
142 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") 150 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
143 #elif defined __s390__ || defined __s390x__ 151 #elif defined __s390__ || defined __s390x__
144 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") 152 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
145 #elif defined __mips__ 153 #elif defined __mips__
146 /* GNU/Linux emulates sync on mips1 architectures, so we force it's use */ 154 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
147 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */ 155 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
148 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory") 156 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
149 #elif defined __alpha__ 157 #elif defined __alpha__
150 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") 158 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
151 #elif defined __hppa__ 159 #elif defined __hppa__
152 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") 160 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
153 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") 161 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
154 #elif defined __ia64__ 162 #elif defined __ia64__
155 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory") 163 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
164 #elif defined __m68k__
165 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
166 #elif defined __m88k__
167 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
168 #elif defined __sh__
169 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
156 #endif 170 #endif
157 #endif 171 #endif
158#endif 172#endif
159 173
160#ifndef ECB_MEMORY_FENCE 174#ifndef ECB_MEMORY_FENCE
161 #if ECB_GCC_VERSION(4,7) 175 #if ECB_GCC_VERSION(4,7)
162 /* see comment below (stdatomic.h) about the C11 memory model. */ 176 /* see comment below (stdatomic.h) about the C11 memory model. */
163 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) 177 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
178 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
179 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
164 180
165 /* The __has_feature syntax from clang is so misdesigned that we cannot use it 181 /* The __has_feature syntax from clang is so misdesigned that we cannot use it
166 * without risking compile time errors with other compilers. We *could* 182 * without risking compile time errors with other compilers. We *could*
167 * define our own ecb_clang_has_feature, but I just can't be bothered to work 183 * define our own ecb_clang_has_feature, but I just can't be bothered to work
168 * around this shit time and again. 184 * around this shit time and again.
169 * #elif defined __clang && __has_feature (cxx_atomic) 185 * #elif defined __clang && __has_feature (cxx_atomic)
170 * // see comment below (stdatomic.h) about the C11 memory model. 186 * // see comment below (stdatomic.h) about the C11 memory model.
171 * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) 187 * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
188 * #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
189 * #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
172 */ 190 */
173 191
174 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ 192 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
175 #define ECB_MEMORY_FENCE __sync_synchronize () 193 #define ECB_MEMORY_FENCE __sync_synchronize ()
194 #elif _MSC_VER >= 1500 /* VC++ 2008 */
195 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
196 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
197 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
198 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
199 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
176 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 200 #elif _MSC_VER >= 1400 /* VC++ 2005 */
177 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 201 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
178 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 202 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
179 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ 203 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
180 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () 204 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
… …
200 /* any fence other than seq_cst, which isn't very efficient for us. */ 224 /* any fence other than seq_cst, which isn't very efficient for us. */
201 /* Why that is, we don't know - either the C11 memory model is quite useless */ 225 /* Why that is, we don't know - either the C11 memory model is quite useless */
202 /* for most usages, or gcc and clang have a bug */ 226 /* for most usages, or gcc and clang have a bug */
203 /* I *currently* lean towards the latter, and inefficiently implement */ 227 /* I *currently* lean towards the latter, and inefficiently implement */
204 /* all three of ecb's fences as a seq_cst fence */ 228 /* all three of ecb's fences as a seq_cst fence */
229 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
230 /* for all __atomic_thread_fence's except seq_cst */
205 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst) 231 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
206 #endif 232 #endif
207#endif 233#endif
208 234
209#ifndef ECB_MEMORY_FENCE 235#ifndef ECB_MEMORY_FENCE
… …
266 #define ecb_is_constant(expr) __builtin_constant_p (expr) 292 #define ecb_is_constant(expr) __builtin_constant_p (expr)
267 #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 293 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
268 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 294 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
269#else 295#else
270 #define ecb_attribute(attrlist) 296 #define ecb_attribute(attrlist)
297
298 /* possible C11 impl for integral types
299 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
300 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
301
271 #define ecb_is_constant(expr) 0 302 #define ecb_is_constant(expr) 0
272 #define ecb_expect(expr,value) (expr) 303 #define ecb_expect(expr,value) (expr)
273 #define ecb_prefetch(addr,rw,locality) 304 #define ecb_prefetch(addr,rw,locality)
274#endif 305#endif
275 306
… …
567 || defined __s390__ || defined __s390x__ \ 598 || defined __s390__ || defined __s390x__ \
568 || defined __mips__ \ 599 || defined __mips__ \
569 || defined __alpha__ \ 600 || defined __alpha__ \
570 || defined __hppa__ \ 601 || defined __hppa__ \
571 || defined __ia64__ \ 602 || defined __ia64__ \
603 || defined __m68k__ \
604 || defined __m88k__ \
605 || defined __sh__ \
572 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 606 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64
573 #define ECB_STDFP 1 607 #define ECB_STDFP 1
574 #include <string.h> /* for memcpy */ 608 #include <string.h> /* for memcpy */
575#else 609#else
576 #define ECB_STDFP 0 610 #define ECB_STDFP 0
577 #include <math.h> /* for frexp*, ldexp* */
578#endif 611#endif
579 612
580#ifndef ECB_NO_LIBM 613#ifndef ECB_NO_LIBM
614
615 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
616
617 /* only the oldest of old doesn't have this one. solaris. */
618 #ifdef INFINITY
619 #define ECB_INFINITY INFINITY
620 #else
621 #define ECB_INFINITY HUGE_VAL
622 #endif
623
624 #ifdef NAN
625 #define ECB_NAN NAN
626 #else
627 #define ECB_NAN ECB_INFINITY
628 #endif
629
630 /* converts an ieee half/binary16 to a float */
631 ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
632 ecb_function_ float
633 ecb_binary16_to_float (uint16_t x)
634 {
635 int e = (x >> 10) & 0x1f;
636 int m = x & 0x3ff;
637 float r;
638
639 if (!e ) r = ldexpf (m , -24);
640 else if (e != 31) r = ldexpf (m + 0x400, e - 25);
641 else if (m ) r = ECB_NAN;
642 else r = ECB_INFINITY;
643
644 return x & 0x8000 ? -r : r;
645 }
581 646
582 /* convert a float to ieee single/binary32 */ 647 /* convert a float to ieee single/binary32 */
583 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const; 648 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
584 ecb_function_ uint32_t 649 ecb_function_ uint32_t
585 ecb_float_to_binary32 (float x) 650 ecb_float_to_binary32 (float x)

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