By: EduardoS (no.delete@this.spam.com), April 26, 2012 2:47 pm
Room: Moderated Discussions
Exophase (exophase@gmail.com) on 4/26/12 wrote:
---------------------------
>I wonder how much the lack of bypassing from AGU to the opposite ALU and AGU hurts
>performance. What kind of penalty does this incur; does latency increase entirely
>until a PRF writeback stage or does it take a longer bypass path (ie, AG0->EX0->EX1->AG1 to cover the entire distance)?
Assuming the manual is correct and no instruction can use AGU without ALU the answear is 0, there will always space on the corresponding AGU.
AGUS will go underutilized, as previous generation.
The ALU/AGU relation looks more and more like previous generation, what's the difference? If they are equal why so much loud about the being different? The coupling in previous generation wasn't a bad idea, if it persists why deny it?
---------------------------
>I wonder how much the lack of bypassing from AGU to the opposite ALU and AGU hurts
>performance. What kind of penalty does this incur; does latency increase entirely
>until a PRF writeback stage or does it take a longer bypass path (ie, AG0->EX0->EX1->AG1 to cover the entire distance)?
Assuming the manual is correct and no instruction can use AGU without ALU the answear is 0, there will always space on the corresponding AGU.
AGUS will go underutilized, as previous generation.
The ALU/AGU relation looks more and more like previous generation, what's the difference? If they are equal why so much loud about the being different? The coupling in previous generation wasn't a bad idea, if it persists why deny it?
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