gcc-4.9/gcc/testsuite/gcc.target/mips/reg-var-1.c


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/* { dg-do run } */
register int g asm ("$18");

void __attribute__((noinline))
test (void)
{
  g = g + 1;
}

int
main (void)
{
  g = 2;
  test ();
  return g != 3;
}