gcc/testsuite/gcc.target/i386/wrgsbase-2.c

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

#include <immintrin.h>

void
write_gs_base64 (unsigned long long base)
{
  _writegsbase_u64 (base);
}