src/gromacs/legacyheaders/thread_mpi/atomic/gcc_ppc.h

   1 /*
   2    This source code file is part of thread_mpi.
   3    Written by Sander Pronk, Erik Lindahl, and possibly others.
   4
   5    Copyright (c) 2009, Sander Pronk, Erik Lindahl.
   6    All rights reserved.
   7
   8    Redistribution and use in source and binary forms, with or without
   9    modification, are permitted provided that the following conditions are met:
  10    1) Redistributions of source code must retain the above copyright
  11    notice, this list of conditions and the following disclaimer.
  12    2) Redistributions in binary form must reproduce the above copyright
  13    notice, this list of conditions and the following disclaimer in the
  14    documentation and/or other materials provided with the distribution.
  15    3) Neither the name of the copyright holders nor the
  16    names of its contributors may be used to endorse or promote products
  17    derived from this software without specific prior written permission.
  18
  19    THIS SOFTWARE IS PROVIDED BY US ''AS IS'' AND ANY
  20    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  21    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22    DISCLAIMED. IN NO EVENT SHALL WE BE LIABLE FOR ANY
  23    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  24    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  26    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  28    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29
  30    If you want to redistribute modifications, please consider that
  31    scientific software is very special. Version control is crucial -
  32    bugs must be traceable. We will be happy to consider code for
  33    inclusion in the official distribution, but derived work should not
  34    be called official thread_mpi. Details are found in the README & COPYING
  35    files.
  36  */
  37
  38
  39 /* NOTE:
  40
  41  ***************************************************************************
  42    this file is not used any more. gcc intrinsics take care of the atomics
  43  ***************************************************************************
  44
  45  */
  46
  47 #error included gcc_ppc.h. This file is outdated
  48
  49
  50
  51 typedef struct tMPI_Atomic
  52 {
  53     volatile int value;   /*!< Volatile, to avoid compiler aliasing */
  54 }
  55 tMPI_Atomic_t;
  56
  57 typedef struct tMPI_Atomic_ptr
  58 {
  59     void* volatile* value;   /*!< Volatile, to avoid compiler aliasing */
  60 }
  61 tMPI_Atomic_ptr_t;
  62
  63
  64 typedef struct tMPI_Spinlock
  65 {
  66     volatile unsigned int lock;   /*!< Volatile, to avoid compiler aliasing */
  67 }
  68 tMPI_Spinlock_t;
  69 #define TMPI_ATOMIC_HAVE_NATIVE_SPINLOCK
  70
  71
  72 #define TMPI_SPINLOCK_INITIALIZER   { 0 }
  73
  74 #define tMPI_Atomic_get(a)        ((a)->value)
  75 #define tMPI_Atomic_set(a, i)     (((a)->value) = (i))
  76
  77 #define tMPI_Atomic_ptr_get(a)    (void*)((a)->value)
  78 #define tMPI_Atomic_ptr_set(a, i)  (((a)->value) = (void*)(i))
  79
  80
  81 #if (TMPI_GCC_VERSION >= 40100)
  82
  83 #include "gcc_intrinsics.h"
  84
  85 #else
  86
  87 /* Compiler-dependent stuff: GCC memory barrier */
  88 #define tMPI_Atomic_memory_barrier() __asm__ __volatile__("isync" : : : "memory")
  89
  90
  91
  92 #define TMPI_ATOMIC_HAVE_NATIVE_SWAP
  93 static inline int tMPI_Atomic_swap(tMPI_Atomic_t *a, int b)
  94 {
  95     int ret;
  96
  97     __asm__ __volatile__ ("1:    lwarx   %0,0,%2 \n"
  98                           "\tstwcx.  %3,0,%2 \n"
  99                           "\tbne-    1b\n"
 100                           : "=&r" (ret), "=m" (a->value)
 101                           : "r" (&(a->value)), "r" (b)
 102                           : "cc", "memory");
 103
 104     return ret;
 105 }
 106
 107 static inline void* tMPI_Atomic_ptr_swap(tMPI_Atomic_ptr_t *a, void *b)
 108 {
 109     int ret;
 110
 111 #if (!defined(__PPC64__)) && (!defined(__ppc64))
 112     __asm__ __volatile__ ("1:    lwarx   %0,0,%2 \n"
 113                           "\tstwcx.  %3,0,%2 \n"
 114                           "\tbne-    1b\n"
 115                           : "=&r" (ret), "=m" (a->value)
 116                           : "r" (&(a->value)), "r" (b)
 117                           : "cc", "memory");
 118 #else
 119     __asm__ __volatile__ ("1:    ldarx   %0,0,%2 \n"
 120                           "\tstdcx.  %3,0,%2 \n"
 121                           "\tbne-    1b\n"
 122                           : "=&r" (ret), "=m" (a->value)
 123                           : "r" (&(a->value)), "r" (b)
 124                           : "cc", "memory");
 125 #endif
 126
 127     return ret;
 128 }
 129
 130
 131
 132 static inline int tMPI_Atomic_cas(tMPI_Atomic_t *a, int oldval, int newval)
 133 {
 134     int prev;
 135
 136     __asm__ __volatile__ ("1:    lwarx   %0,0,%2 \n"
 137                           "\tcmpw    0,%0,%3 \n"
 138                           "\tbne     2f \n"
 139                           "\tstwcx.  %4,0,%2 \n"
 140                           "bne-    1b\n"
 141                           "\tsync\n"
 142                           "2:\n"
 143                           : "=&r" (prev), "=m" (a->value)
 144                           : "r" (&a->value), "r" (oldval), "r" (newval),
 145                           "m" (a->value)
 146                           : "cc", "memory");
 147
 148     return prev == oldval;
 149 }
 150
 151
 152 static inline int tMPI_Atomic_ptr_cas(tMPI_Atomic_ptr_t *a, void *oldval,
 153                                       void *newval)
 154 {
 155     void *prev;
 156
 157 #if (!defined(__PPC64__)) && (!defined(__ppc64))
 158     __asm__ __volatile__ ("1:    lwarx   %0,0,%2 \n"
 159                           "\tcmpw    0,%0,%3 \n"
 160                           "\tbne     2f \n"
 161                           "\tstwcx.  %4,0,%2 \n"
 162                           "bne-    1b\n"
 163                           "\tsync\n"
 164                           "2:\n"
 165                           : "=&r" (prev), "=m" (a->value)
 166                           : "r" (&a->value), "r" (oldval), "r" (newval),
 167                           "m" (a->value)
 168                           : "cc", "memory");
 169 #else
 170     __asm__ __volatile__ ("1:    ldarx   %0,0,%2 \n"
 171                           "\tcmpd    0,%0,%3 \n"
 172                           "\tbne     2f \n"
 173                           "\tstdcx.  %4,0,%2 \n"
 174                           "bne-    1b\n"
 175                           "\tsync\n"
 176                           "2:\n"
 177                           : "=&r" (prev), "=m" (a->value)
 178                           : "r" (&a->value), "r" (oldval), "r" (newval),
 179                           "m" (a->value)
 180                           : "cc", "memory");
 181 #endif
 182     return prev == oldval;
 183 }
 184
 185 #define TMPI_ATOMIC_HAVE_NATIVE_ADD_RETURN
 186 static inline int tMPI_Atomic_add_return(tMPI_Atomic_t *a, int i)
 187 {
 188     int t;
 189
 190     __asm__ __volatile__("1:     lwarx   %0,0,%2\n"
 191                          "\tadd     %0,%1,%0\n"
 192                          "\tstwcx.  %0,0,%2 \n"
 193                          "\tbne-    1b\n"
 194                          "\tisync\n"
 195                          : "=&r" (t)
 196                          : "r" (i), "r" (&a->value)
 197                          : "cc", "memory");
 198     return t;
 199 }
 200
 201
 202
 203 #define TMPI_ATOMIC_HAVE_NATIVE_FETCH_ADD
 204 static inline int tMPI_Atomic_fetch_add(tMPI_Atomic_t *a, int i)
 205 {
 206     int t;
 207
 208     __asm__ __volatile__("\teieio\n"
 209                          "1:     lwarx   %0,0,%2\n"
 210                          "\tadd     %0,%1,%0\n"
 211                          "\tstwcx.  %0,0,%2 \n"
 212                          "\tbne-    1b\n"
 213                          "\tisync\n"
 214                          : "=&r" (t)
 215                          : "r" (i), "r" (&a->value)
 216                          : "cc", "memory");
 217
 218     return (t - i);
 219 }
 220
 221
 222 #endif
 223
 224
 225 static inline void tMPI_Spinlock_init(tMPI_Spinlock_t *x)
 226 {
 227     x->lock = 0;
 228 }
 229
 230
 231
 232 static inline void tMPI_Spinlock_lock(tMPI_Spinlock_t *x)
 233 {
 234     unsigned int tmp;
 235
 236     __asm__ __volatile__("\tb      1f\n"
 237                          "2:      lwzx    %0,0,%1\n"
 238                          "\tcmpwi   0,%0,0\n"
 239                          "\tbne+    2b\n"
 240                          "1:      lwarx   %0,0,%1\n"
 241                          "\tcmpwi   0,%0,0\n"
 242                          "\tbne-    2b\n"
 243                          "\tstwcx.  %2,0,%1\n"
 244                          "bne-    2b\n"
 245                          "\tisync\n"
 246                          : "=&r" (tmp)
 247                          : "r" (&x->lock), "r" (1)
 248                          : "cr0", "memory");
 249 }
 250
 251
 252 static inline int tMPI_Spinlock_trylock(tMPI_Spinlock_t *x)
 253 {
 254     unsigned int           old, t;
 255     unsigned int           mask = 1;
 256     volatile unsigned int *p    = &x->lock;
 257
 258     __asm__ __volatile__("\teieio\n"
 259                          "1:      lwarx   %0,0,%4 \n"
 260                          "\tor      %1,%0,%3 \n"
 261                          "\tstwcx.  %1,0,%4 \n"
 262                          "\tbne     1b\n"
 263                          "\tsync\n"
 264                          : "=&r" (old), "=&r" (t), "=m" (*p)
 265                          : "r" (mask), "r" (p), "m" (*p)
 266                          : "cc", "memory");
 267
 268     return (old & mask);
 269 }
 270
 271
 272 static inline void tMPI_Spinlock_unlock(tMPI_Spinlock_t *x)
 273 {
 274     __asm__ __volatile__("\teieio\n" : : : "memory");
 275     x->lock = 0;
 276 }
 277
 278
 279 static inline int tMPI_Spinlock_islocked(const tMPI_Spinlock_t *x)
 280 {
 281     return ( x->lock != 0);
 282 }
 283
 284
 285 static inline void tMPI_Spinlock_wait(tMPI_Spinlock_t *x)
 286 {
 287     do
 288     {
 289         tMPI_Atomic_memory_barrier();
 290     }
 291     while (tMPI_Spinlock_islocked(x));
 292 }