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#include "config.h"
#include <stdio.h>
#include <assert.h>
/* Simple test program, no race.
Tests the 'xadd' exchange-and-add instruction with {r,r} operands, which is rarely generated by compilers. */
#undef PLAT_x86_linux
#undef PLAT_amd64_linux
#undef PLAT_ppc32_linux
#undef PLAT_ppc64_linux
#if defined(__i386__)
# define PLAT_x86_linux 1
#elif defined(__x86_64__)
# define PLAT_amd64_linux 1
#endif
#if defined(PLAT_amd64_linux) || defined(PLAT_x86_linux)
# define XADD_R_R(_addr,_lval) \
__asm__ __volatile__( \
"xadd %1, %0" \
: /*out*/ "=r"(_lval),"=r"(_addr) \
: /*in*/ "0"(_lval),"1"(_addr) \
: "flags" \
)
#else
# error "Unsupported architecture"
#endif
int main ( void )
{
long d = 20, s = 2;
long xadd_r_r_res;
#define XADD_R_R_RES 42
XADD_R_R(s, d);
xadd_r_r_res = s + d;
assert(xadd_r_r_res == XADD_R_R_RES);
if (xadd_r_r_res == XADD_R_R_RES)
printf("success\n");
else
printf("failure\n");
return xadd_r_r_res;
}
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