/usr/include/mpich/primitives/opa_gcc_ia64.h is in libmpich-dev 3.2-6build1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 | /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
* (C) 2008 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
/* NOTE: We (@ANL) do not have easy access to any ia64 hosts, so it is difficult
* to develop and test updates to this file. Any help in this regard is greatly
* appreciated. */
#ifndef OPA_GCC_IA64_H_INCLUDED
#define OPA_GCC_IA64_H_INCLUDED
/* FIXME do we need to align these? */
typedef struct { volatile int v; } OPA_int_t;
typedef struct { void * volatile v; } OPA_ptr_t;
#define OPA_INT_T_INITIALIZER(val_) { (val_) }
#define OPA_PTR_T_INITIALIZER(val_) { (val_) }
/* Aligned loads and stores are atomic on ia64. */
static _opa_inline int OPA_load_int(_opa_const OPA_int_t *ptr)
{
return ptr->v;
}
/* Aligned loads and stores are atomic on ia64. */
static _opa_inline void OPA_store_int(OPA_int_t *ptr, int val)
{
ptr->v = val;
}
/* Aligned loads and stores are atomic on ia64. */
static _opa_inline void *OPA_load_ptr(_opa_const OPA_ptr_t *ptr)
{
return ptr->v;
}
/* Aligned loads and stores are atomic on ia64. */
static _opa_inline void OPA_store_ptr(OPA_ptr_t *ptr, void *val)
{
ptr->v = val;
}
/* NOTE-IA64-1 ia64 suports half-fence suffixes to ld/st instructions. It seems
* that compilers also treat any C-language load/store from/to a volatile
* variable as acquire/release and append the corresponding suffix accordingly.
* But we don't have extensive testing to back this up, so we'll explicitly
* force these instructions for now. When using the C-level approach, it's not
* clear what instructions the compiler is allowed to reorder. */
#if 0
/* acquire means operations after the acquire will see any memory opeations
* performed before the corresponding paired release operation */
static _opa_inline int OPA_load_acquire_int(_opa_const OPA_int_t *ptr)
{
int tmp;
__asm__ __volatile__ ("ld.acq %0=[%1]"
: "=r" (tmp)
: "r" (ptr->v)
: "memory");
return tmp;
}
static _opa_inline void OPA_store_release_int(OPA_int_t *ptr, int val)
{
__asm__ __volatile__ ("st.rel [%0]=%1"
: "=m" (ptr->v)
: "r" (val)
: "memory");
}
static _opa_inline void *OPA_load_acquire_ptr(_opa_const OPA_ptr_t *ptr)
{
int tmp;
__asm__ __volatile__ ("ld.acq %0=[%1]"
: "=r" (tmp)
: "r" (ptr->v)
: "memory");
return tmp;
}
static _opa_inline void OPA_store_release_ptr(OPA_ptr_t *ptr, void *val)
{
__asm__ __volatile__ ("st.rel [%0]=%1"
: "=m" (ptr->v)
: "r" (val)
: "memory");
}
#else
/* FIXME because we can't test these implementations, they are currently
* disabled. The above impls are rough starting points, but probably won't
* compile/assemble correctly as-is. Patches are welcome :) */
#define OPA_load_acquire_int(ptr_) ::"choke me"
#define OPA_store_release_int(ptr_,val_) ::"choke me"
#define OPA_load_acquire_ptr(ptr_) ::"choke me"
#define OPA_store_release_ptr(ptr_,val_) ::"choke me"
#endif
#define OPA_add_int_by_faa OPA_add_int
#define OPA_incr_int_by_faa OPA_incr_int
#define OPA_decr_int_by_faa OPA_decr_int
#define OPA_fetch_and_decr_int_by_faa OPA_fetch_and_decr_int
#define OPA_fetch_and_incr_int_by_faa OPA_fetch_and_incr_int
static _opa_inline int OPA_decr_and_test_int(OPA_int_t *ptr)
{
int val;
__asm__ __volatile__ ("fetchadd4.rel %0=[%2],%3"
: "=r"(val), "=m"(ptr->v)
: "r"(&ptr->v), "i"(-1));
return val == 1;
}
static _opa_inline int OPA_cas_int(OPA_int_t *ptr, int oldv, int newv)
{
int prev;
#if OPA_SIZEOF_INT == 8
__asm__ __volatile__ ("mov ar.ccv=%1;;"
"cmpxchg8.rel %0=[%3],%4,ar.ccv"
: "=r"(prev), "=m"(ptr->v)
: "rO"(oldv), "r"(&ptr->v), "r"(newv)
: "memory");
break;
#elif OPA_SIZEOF_INT == 4
__asm__ __volatile__ ("zxt4 %1=%1;;" /* don't want oldv sign-extended to 64 bits */
"mov ar.ccv=%1;;"
"cmpxchg4.rel %0=[%3],%4,ar.ccv"
: "=r"(prev), "=m"(ptr->v)
: "r0"(oldv), "r"(&ptr->v), "r"(newv)
: "memory");
#else
#error OPA_SIZEOF_INT is not 4 or 8
#endif
return prev;
}
/* IA64 has a fetch-and-add instruction that only accepts immediate
values of -16, -8, -4, -1, 1, 4, 8, and 16. So we check for these
values before falling back to the CAS implementation. */
#define OPA_IA64_FAA_CASE_MACRO(ptr, val) case val: { \
int prev; \
__asm__ __volatile__ ("fetchadd4.rel %0=[%2],%3" \
: "=r"(prev), "=m"(ptr->v) \
: "r"(&ptr->v), "i"(val)); \
return prev; \
} \
break
static _opa_inline int OPA_fetch_and_add_int(OPA_int_t *ptr, int val)
{
switch (val)
{
OPA_IA64_FAA_CASE_MACRO(ptr, -16);
OPA_IA64_FAA_CASE_MACRO(ptr, -8);
OPA_IA64_FAA_CASE_MACRO(ptr, -4);
OPA_IA64_FAA_CASE_MACRO(ptr, -1);
OPA_IA64_FAA_CASE_MACRO(ptr, 1);
OPA_IA64_FAA_CASE_MACRO(ptr, 4);
OPA_IA64_FAA_CASE_MACRO(ptr, 8);
OPA_IA64_FAA_CASE_MACRO(ptr, 16);
default:
{
int cmp;
int prev = OPA_load_int(ptr);
do {
cmp = prev;
prev = OPA_cas_int(ptr, cmp, val);
} while (prev != cmp);
return prev;
}
}
}
#undef OPA_IA64_FAA_CASE_MACRO
static _opa_inline void *OPA_cas_ptr(OPA_ptr_t *ptr, void *oldv, void *newv)
{
void *prev;
__asm__ __volatile__ ("mov ar.ccv=%1;;"
"cmpxchg8.rel %0=[%3],%4,ar.ccv"
: "=r"(prev), "=m"(ptr->v)
: "rO"(oldv), "r"(&ptr->v), "r"(newv));
return prev;
}
static _opa_inline void *OPA_swap_ptr(OPA_ptr_t *ptr, void *val)
{
__asm__ __volatile__ ("xchg8 %0=[%2],%3"
: "=r" (val), "=m" (ptr->v)
: "r" (&ptr->v), "0" (val));
return val;
}
static _opa_inline int OPA_swap_int(OPA_int_t *ptr, int val)
{
__asm__ __volatile__ ("xchg8 %0=[%2],%3"
: "=r" (val), "=m" (ptr->v)
: "r" (&ptr->v), "0" (val));
return val;
}
#define OPA_write_barrier() __asm__ __volatile__ ("mf" ::: "memory" )
#define OPA_read_barrier() __asm__ __volatile__ ("mf" ::: "memory" )
#define OPA_read_write_barrier() __asm__ __volatile__ ("mf" ::: "memory" )
#define OPA_compiler_barrier() __asm__ __volatile__ ("" ::: "memory" )
#include "opa_emulated.h"
#endif /* OPA_GCC_IA64_H_INCLUDED */
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