[Bug inline-asm/67334] [4.7 arm inline-asm] inline assembly incorrect register allocation

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67334

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
That is:
__asm__ volatile ("\n"
  "       adds    %0,%2,%4\n"
  "       adc     %1,%3,$0"
  : "=&r"(c),"=r"(d)
  : "r"(a),"r"(b),"r"(i) : "cc");

Because the first (0th) operand gets clobbered (set) before you use the other
ones.