This is the mail archive of the gcc-help@gcc.gnu.org mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: Ways to fill the stack

11.02.2013, 20:28, "Ian Lance Taylor" <iant@google.com>:

>  Still, you may be right that in this case it would be slightly more
>  efficient to construct the local arrays using push instructions.

I did some tests for clang v 2.3 and gcc v 4.5.4  http://yadi.sk/d/_F00QtcN2YJsE
Clang uses xmm in case of small chunks and calls memcpy in case of large chunk. Most likely it is faster than push.
It does not write const string in stack, it builds the array separately and transfers address into the function.
Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]