Moved to gcc0help. On 29/01/17 15:56, parmenides via gcc wrote: > It is obvious that every variables are cached into register, and even > though the 'sum' is used after the barrier, it does not written back to > its memory location and read again. I think my idea about the "memory" > and the volatile keyword must be misunderstanding. Any suggestion? The memory must be reachable: unless an auto variable has its address taken it cannot be reached from the asm. There are no reachable memory operands in your program. Andrew.
