On 2012年03月16日 23:23, Dave Hylands wrote:
> Hi Bill,
>
> On Thu, Mar 15, 2012 at 11:52 PM, bill4carson<bill4carson@xxxxxxxxx> wrote:
>> Hi, All
>>
>> The question is simple.
>>
>> func_a {
>>
>> call func_b
>> }
>>
>> func_b {
>>
>> call func_c
>> }
>>
>> func_c {
>>
>> return to func_a
>> }
>>
>>
>> The compiler I use let func_c to return func_a directly, IOW when func_b
>> calls func_c, it use JUMP, other JUMP and LINK, and it's definitely not
>> a question about inline or noinline.
>>
>> So can I ask why how to let the compiler use JUMP and LINK when func_b
>> calls func_c?
>
> This is called Tail Optimization. See
> http://c2.com/cgi/wiki?TailCallOptimization
>
> gcc (I'm using 4.4.4) with -O3 does this.
>
Thanks for the information.
>> If it's not the right place to post this, sorry for the noise.
>
> The kernel newbies list is probably not the right place (since this
> has nothing to do with the kernel). It also has nothing to do with
> binutils. It's a gcc optimization, so picking a gcc list would
> probably be more appropriate.
>
--
I am a slow learner
but I will keep trying to fight for my dreams!
--bill
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