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

/* { dg-do compile { target { ! ia32 } } } */
/* { dg-options "-O2 -mfsgsbase" } */
/* { dg-final { scan-assembler "rdgsbase\[ \t]+(%|)eax" } } */

#include <immintrin.h>

unsigned int
read_gs_base32 (void)
{
  return _readgsbase_u32 ();
}