gcc/testsuite/gcc.target/i386/fxsave-1.c

/* { dg-do compile } */
/* { dg-options "-mfxsr -O2" } */
/* { dg-final { scan-assembler "fxsave\[ \\t\]" } } */

#include <x86intrin.h>

void extern
fxsave_test (void)
{
  char fxsave_region [512] __attribute__((aligned(16)));
  _fxsave (fxsave_region);
}