the difference between -mtune and -march

[keshav yadav]

Hi ali,

-march is arch (mips/arm)
-mtune(specifc to core like 34kc etc)
thanks

On Tue, Feb 8, 2011 at 2:13 PM, ali hagigat <hagigatali@gmail.com> wrote:
> Why two separate options have been considered for gcc, -mtune and
> -march? I wonder if anybody can give an example application of using
> these options while they are different.
> By -mtune the code is optimized for one specific processor, what does
> this optimization mean? gcc changes the assembly instructions
> specified by -march and will turn them into the processor specified by
> -mtune?
> So why do we need -mtune? We can compile by -march from the beginning.
>