Viewing file:  atomic-exchange-4.c (1.86 KB) -rw-r--r--
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/* Test the atomic exchange expansion, execution. */
/* { dg-do run } */
/* { dg-options "-Wno-long-long" } */
/* We're trying to generate this type of store/exchange/load sequence:
st.global.u32 [g32], %r60;
atom.global.exch.b32 %r22, [g32], 2;
ld.global.u32 %r23, [g32];
with no insns inbetween.
We compile this at -O0, to keep the compiler from optimizing out the
"p = (P)" assignment. If the assignment is optimized out we don't test
the generic case, iow we generate for instance atom.global.exch.b32 instead
of atom.exch.b32.
Compiling at -O0 however does introduce loads and stores in the
store/exchange/load sequence, so we fix that by using the register
keyword. */
enum memmodel
{
MEMMODEL_RELAXED = 0,
};
unsigned int g32;
unsigned long long int g64;
unsigned int s32 __attribute__((shared));
unsigned long long int s64 __attribute__((shared));
#define TEST(P, V1, V2) \
{ \
register typeof (*(P)) tmp; \
register typeof (*(P)) tmp2; \
__atomic_store_n ((P), (V1), MEMMODEL_RELAXED); \
tmp = __atomic_exchange_n ((P), (V2), MEMMODEL_RELAXED); \
tmp2 = __atomic_load_n ((P), MEMMODEL_RELAXED); \
if (tmp != (V1) || tmp2 != (V2)) \
__builtin_abort (); \
}
#define TEST2(P, V1, V2) \
{ \
register typeof (*(P)) tmp; \
register typeof (*(P)) tmp2; \
*(P) = (V1); \
tmp = __atomic_exchange_n ((P), (V2), MEMMODEL_RELAXED); \
tmp2 = *(P); \
if (tmp != (V1) || tmp2 != (V2)) \
__builtin_abort (); \
}
#define TESTS(P) \
{ \
TEST ((P), 1, 2); \
TEST2 ((P), 3, 4); \
{ \
register typeof (*(P)) * p = (P); \
TEST (p, 1, 2); \
TEST2 (p, 3, 4); \
} \
}
int
main ()
{
TESTS (&g32);
TESTS (&g64);
TESTS (&s32);
TESTS (&s64);
return 0;
}
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