Hi,
(pls CC me when replying because I am not subscriber)
I met an interesting phenomenon when looking into linux kernel
compilation, it can be simply summarized as following: in
arch/x86/boot/compressed, memcpy is defined as __builtin_memcpy, while
also implemented as a function. But when using m
On 1/11/19 4:03 AM, Cao jin wrote:
> Now the questions is: from code-reading, it is kind of non-intuitive, is
> there any explicit way to control the optimization behavior accurately?
Hi.
Please take a look here:
https://gcc.gnu.org/onlinedocs/gcc.pdf
you are searching for:
-mmemcpy
-mno-memcpy
Hi Martin,
On 1/11/19 5:22 PM, Martin Liška wrote:
> On 1/11/19 4:03 AM, Cao jin wrote:
>> Now the questions is: from code-reading, it is kind of non-intuitive, is
>> there any explicit way to control the optimization behavior accurately?
>
> Hi.
>
> Please take a look here:
> https://gcc.gnu.or
On 1/11/19 7:09 PM, Cao jin wrote:
> Hi Martin,
>>
>> and possibly for:
>> -mmemcpy-strategy
>>
>> and
>> -mstringop-strategy=alg
>>
>
> And yes, -mmemcpy-strategy worked as I expected.
typo. It is -mstringop-strategy=byte_loop
--
Sincerely,
Cao jin
