gcc/libgomp/testsuite/libgomp.c/atomic-6.c

39 lines
657 B
C

/* PR middle-end/36106 */
/* { dg-options "-O2" } */
/* { dg-options "-O2 -mieee" { target alpha*-*-* } } */
/* { dg-options "-O2 -march=i586" { target { { i?86-*-* x86_64-*-* } && ilp32 } } } */
#ifdef __i386__
# include "cpuid.h"
#endif
extern void abort (void);
union { unsigned long long l; double d; } u = { .l = 0x7ff0000000072301ULL };
int __attribute__((noinline))
do_test (void)
{
#pragma omp atomic
u.d += 1.0L;
return 0;
}
int
main (void)
{
#ifdef __i386__
unsigned int eax, ebx, ecx, edx;
if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
return 0;
if (!(edx & bit_CMPXCHG8B))
return 0;
#endif
do_test ();
return 0;
}