[Bug target/110170] Sub-optimal conditional jumps in conditional-swap with floating point

["pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110170

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |x86_64-linux-gnu

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note for aarch64, we do produce conditional moves but only when there is a
loop.

That is:
```
__attribute__((noinline))
void __cond_swap(double* __x, double* __y) {
  for(int i = 0; i < 100; i++, __x++, __y++) {
  double __r = (*__x < *__y);
  double __tmp = __r ? *__x : *__y;
  *__y = __r ? *__y : *__x;
  *__x = __tmp;
  }
}
```
Produces:
```
.L3:
        ldr     d31, [x0, x2]
        ldr     d30, [x1, x2]
        fcmpe   d31, d30
        fcsel   d29, d30, d31, mi
        fcsel   d31, d31, d30, mi
        str     d29, [x1, x2]
        str     d31, [x0, x2]
        add     x2, x2, 8
        cmp     x2, 800
        bne     .L3
```

Otherwise it will duplicate the return basic block (which is expected).

So this is a x86_64 specific issue.