[Bug target/79354] New: [7 Regression] -mcpu=power8 -O2 generates power9 instruction on powerpc64le-linux

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79354

            Bug ID: 79354
           Summary: [7 Regression] -mcpu=power8 -O2 generates power9
                    instruction on powerpc64le-linux
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
  Target Milestone: ---

int b, f, g;
float e;
unsigned long d;

__attribute__((noinline, noclone)) void
foo (int *a)
{
  for (g = 0; g < 32; g++)
    if (f)
      {
        e = d;
        __builtin_memcpy (&b, &e, sizeof (float));
        b = *a;
      }
}

int
main ()
{
  int h = 5;
  f = 1;
  asm volatile ("" : : : "memory");
  foo (&h);
  return 0;
}

compiled with -O2 -mcpu=power8 actually emits a power9 stxssp instruction.