[ViewVC] Diff of: cvs/libeio/ecb.h

Comparing libeio/ecb.h (file contents):
Revision 1.15 by root, Wed Jul 25 16:12:28 2012 UTC vs.
Revision 1.20 by root, Fri Apr 11 05:19:41 2014 UTC

 /*
  * libecb - http://software.schmorp.de/pkg/libecb
  *
- * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
+ * Copyright (©) 2009-2014 Marc Alexander Lehmann <libecb@schmorp.de>
  * Copyright (©) 2011 Emanuele Giaquinta
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without modifica-
  * tion, are permitted provided that the following conditions are met:
 #ifndef ECB_H
 #define ECB_H
 /* 16 bits major, 16 bits minor */
-#define ECB_VERSION 0x00010002
+#define ECB_VERSION 0x00010003
 #ifdef _WIN32
   typedef   signed char   int8_t;
   typedef unsigned char  uint8_t;
   typedef   signed short  int16_t;
   #else
     #define ECB_PTRSIZE 4
   #endif
 #endif
+/* work around x32 idiocy by defining proper macros */
+#if __amd64 || __x86_64 || _M_AMD64 || _M_X64
+  #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
  * what their idiot authors think are the "more important" extensions,
  * causing enormous grief in return for some better fake benchmark numbers.
  * or so.
  * we try to detect these and simply assume they are not gcc - if they have
   #else
     #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
   #endif
 #endif
-#define ECB_C     (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
-#define ECB_C99   (__STDC_VERSION__ >= 199901L)
-#define ECB_C11   (__STDC_VERSION__ >= 201112L)
 #define ECB_CPP   (__cplusplus+0)
 #define ECB_CPP11 (__cplusplus >= 201103L)
+#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)
 #if ECB_CPP
   #define ECB_EXTERN_C extern "C"
   #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
   #define ECB_EXTERN_C_END }
        || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
       #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_7M__ || defined __ARM_ARCH_7R__
       #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("dmb"      : : : "memory")
+    #elif __aarch64__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("dmb ish"  : : : "memory")
-    #elif __sparc || __sparc__
+    #elif (__sparc || __sparc__) && !__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__ ("sync"     : : : "memory")
+      #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(4,7)
     /* 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)
   /* The __has_feature syntax from clang is so misdesigned that we cannot use it
    * without risking compile time errors with other compilers. We *could*
    * define our own ecb_clang_has_feature, but I just can't be bothered to work
-   * around * this shit time and again.
+   * around this shit time and again.
    * #elif defined __clang && __has_feature (cxx_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)
    */
   #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
     #define ECB_MEMORY_FENCE         __sync_synchronize ()
+  #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 ()
     /* any fence other than seq_cst, which isn't very efficient for us. */
     /* Why that is, we don't know - either the C11 memory model is quite useless */
     /* for most usages, or gcc and clang have a bug */
     /* I *currently* lean towards the latter, and inefficiently implement */
     /* all three of ecb's fences as a seq_cst fence */
+    /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
+    /* for all __atomic_thread_fence's except seq_cst */
     #define ECB_MEMORY_FENCE         atomic_thread_fence (memory_order_seq_cst)
   #endif
 #endif
 #ifndef ECB_MEMORY_FENCE
   #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)
 #else
   #define ecb_attribute(attrlist)
+  /* 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
   #define ecb_expect(expr,value)         (expr)
   #define ecb_prefetch(addr,rw,locality)
 #endif
 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
 ecb_inline unsigned char
 ecb_byteorder_helper (void)
 {
   /* the union code still generates code under pressure in gcc, */
-  /* but less than using pointers, and always seem to */
+  /* 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 */
-  /* and yes, gcc defines __BYTE_ORDER__, g++ does not */
+  /* or when using a recent enough gcc version (>= 4.6) */
 #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
   return 0x44;
 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
   return 0x44;
 #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
-  retrurn 0x11;
+  return 0x11;
 #else
   union
   {
     uint32_t i;
     uint8_t c;
 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
 #if 0 \
     || __i386 || __i386__ \
     || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
     || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
-    || defined __arm__ && defined __ARM_EABI__ \
     || defined __s390__ || defined __s390x__ \
     || defined __mips__ \
     || defined __alpha__ \
     || defined __hppa__ \
     || defined __ia64__ \
+    || defined __m68k__ \
+    || defined __m88k__ \
+    || defined __sh__ \
-    || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64
+    || defined _M_IX86 || defined _M_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 <string.h> /* for memcpy */
 #else
   #define ECB_STDFP 0
-  #include <math.h> /* for frexp*, ldexp* */
 #endif
 #ifndef ECB_NO_LIBM
+  #include <math.h> /* 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
+  /* converts an ieee half/binary16 to a float */
+  ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
+  ecb_function_ float
+  ecb_binary16_to_float (uint16_t x)
+  {
+    int e = (x >> 10) & 0x1f;
+    int m = x & 0x3ff;
+    float r;
+    if      (!e     ) r = ldexpf (m        ,    -24);
+    else if (e != 31) r = ldexpf (m + 0x400, e - 25);
+    else if (m      ) r = ECB_NAN;
+    else              r = ECB_INFINITY;
+    return x & 0x8000 ? -r : r;
+  }
   /* convert a float to ieee single/binary32 */
   ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
   ecb_function_ uint32_t
   ecb_float_to_binary32 (float x)

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Comparing libeio/ecb.h (file contents): Revision 1.15 by root, Wed Jul 25 16:12:28 2012 UTC vs. Revision 1.20 by root, Fri Apr 11 05:19:41 2014 UTC

Diff Legend

Comparing libeio/ecb.h (file contents):
Revision 1.15 by root, Wed Jul 25 16:12:28 2012 UTC vs.
Revision 1.20 by root, Fri Apr 11 05:19:41 2014 UTC