Viewing file:  atomic-inst-cas.c (2.29 KB) -rw-r--r--
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/* { dg-do compile } */
/* -Winvalid-memory-model warnings are issued before the dead invalid calls
are removed. */
/* { dg-options "-O2 -march=armv8-a+lse -Wno-invalid-memory-model" } */
/* Test ARMv8.1-A CAS instruction. */
#include "atomic-inst-ops.inc"
#define TEST TEST_TWO
#define CAS_ATOMIC(FN, TY, MODEL1, MODEL2) \
int FNNAME (FN, TY) (TY* val, TY* foo, TY* bar) \
{ \
int model_s = MODEL1; \
int model_f = MODEL2; \
/* The success memory ordering must be at least as strong as \
the failure memory ordering. */ \
if (model_s < model_f) \
return 0; \
/* Ignore invalid memory orderings. */ \
if (model_f == __ATOMIC_RELEASE || model_f == __ATOMIC_ACQ_REL) \
return 0; \
return __atomic_compare_exchange_n (val, foo, bar, 0, model_s, model_f); \
}
#define CAS_ATOMIC_NORETURN(FN, TY, MODEL1, MODEL2) \
void FNNAME (FN, TY) (TY* val, TY* foo, TY* bar) \
{ \
int model_s = MODEL1; \
int model_f = MODEL2; \
/* The success memory ordering must be at least as strong as \
the failure memory ordering. */ \
if (model_s < model_f) \
return; \
/* Ignore invalid memory orderings. */ \
if (model_f == __ATOMIC_RELEASE || model_f == __ATOMIC_ACQ_REL) \
return; \
__atomic_compare_exchange_n (val, foo, bar, 0, model_s, model_f); \
}
TEST (cas_atomic, CAS_ATOMIC)
TEST (cas_atomic_noreturn, CAS_ATOMIC_NORETURN)
/* { dg-final { scan-assembler-times "casb\t" 4} } */
/* { dg-final { scan-assembler-times "casab\t" 20} } */
/* { dg-final { scan-assembler-times "caslb\t" 4} } */
/* { dg-final { scan-assembler-times "casalb\t" 36} } */
/* { dg-final { scan-assembler-times "cash\t" 4} } */
/* { dg-final { scan-assembler-times "casah\t" 20} } */
/* { dg-final { scan-assembler-times "caslh\t" 4} } */
/* { dg-final { scan-assembler-times "casalh\t" 36} } */
/* { dg-final { scan-assembler-times "cas\t" 8} } */
/* { dg-final { scan-assembler-times "casa\t" 40} } */
/* { dg-final { scan-assembler-times "casl\t" 8} } */
/* { dg-final { scan-assembler-times "casal\t" 72} } */
/* { dg-final { scan-assembler-not "ldaxr\t" } } */
/* { dg-final { scan-assembler-not "stlxr\t" } } */
/* { dg-final { scan-assembler-not "dmb" } } */
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