optimization by as

[Yury Gribov]

On 08/10/2015 05:53 PM, Paul_Koning@Dell.com wrote:
>
>> On Aug 10, 2015, at 2:41 AM, Virendra Kumar Pathak <kumarvir.pathak@gmail.com> wrote:
>>
>> Hi Andrew,
>>
>> Thanks for the reply.
>>
>> What other types of optimization can be handled by the assembler ?
>> Are they capable of re-ordering the instructions ?
>> For example inserting other instruction between two loads (on machine
>> with one load unit) to avoid pipeline stall.
>
> Good assemblers don’t do optimization; that is the job of the compiler (or, in the uncommon case of hand-written assembly language, the programmer).  The MIPS assembler is an aberration, fortunately a rare one.  Note that this “optimization” machinery is turned off by recent compilers when they feed generated code to the assembler, because it gets in the way of the compiler doing a better job.

AFAIR PS3 assembler was also optimizing (e.g. it could do register 
allocation and instruction scheduling).

-Y