What does mean "-" for latency?

[joonywie]

What does mean "-" for latency?

ex)

__m512i _mm512_permutexvar_epi16 (__m512i idx, __m512i a)

Architecture	Latency	Throughput (CPI)
Icelake	-	1
Skylake	6	2

i heard that "-" means 0 or unmeasurable(lesser than 6 or greater than 6?).

is this instruction improved or what?

thanks

[HemanthCH_Intel]

Hi,

Thank you for posting in Intel Communities.

We are working on this internally and will get back to you soon.

Thanks & Regards,

Hemanth

[Thorax581]

Any update on this?  I too would like to know the answer as a number of intrinsics I'm using have a latency of "-".  Thanks.

[HemanthCH_Intel · Accepted solution]

Hi,

Could you please check the latency of the Intrinsics from the below link by using the Instruction of the intrinsic:

https://uops.info/table.html

Thanks & Regards,

Hemanth

[joonywie]

I heard that site from the intel engineer just before.

Thanks for helping me.

[HemanthCH_Intel]

Hi,

Glad to know that your issue is resolved. If you need any additional information, please post a new question as this thread will no longer be monitored by Intel.

Thanks & Regards,

Hemanth