回复：Re: What does %P1 mean in gcc inline assembly?

[张云]

Maybe your compiler version is different from us. Mine is 4.9.2（debian）as same as daveti's.


发自 网易邮箱大师
在2016年03月07日 10:51，Adam Lee 写道:
On Sat, Mar 05, 2016 at 11:37:21AM +0800, 张云 wrote:
>
>     On Mar 4, 2016, at 11:59 PM, Dave Tian <dave.jing.tian at gmail.com> wrote:
>
>     This ‘P’ is used to make gcc happy and work.
>     Without ‘P’, this inline would be interpreted as:
>     leal $-512(%esp), %eax
>     With ‘P’, this inline is the thing we really want:
>     leal -512(%esp), %eax
>
>     Eventually, my gcc 4.9.2 does not compile with ‘P’ is missing. I am not
>     sure if this is still the case for newer gcc (5/6). But you get the point.
>
>     -daveti
>
> Thank you for your detailed answer !
>
> By the way， If someone have the problems alike, I suggest them to write some
> inline assembly and check the compiler’s assembly output.

Didn't get different outputs here, do you have updates?

--
Adam Lee
http://adam8157.info

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