Inline Assembly queries

[Ian Lance Taylor]

kernel mailz <kernelmailz at googlemail.com> writes:

> I tried a small example
>
> int *p = 0x1000;
> int a = *p;
> asm("sync":::"memory");
> a = *p;
>
> and
>
> volatile int *p = 0x1000;
> int a = *p;
> asm("sync");
> a = *p
>
> Got the same assembly.
> Which is right.
>
> So does it mean, if proper use of volatile is done, there is no need
> of "memory" ?

You have to consider the effects of inlining, which may bring in other
memory loads and stores through non-volatile pointers.

Ian