4K False Store Forwarding...

[Evren_Yurtesen]

Hello,

I have a code which shows high level of load block due to store overlap (due to 4k aliasing) in vtune. I have implemented the same code using SSE and this bottleneck seem to have disappeared.

But I couldnt find any information if the 4k aliasing bottleneck effects or doesnt effect SSE code. All the examples use non-sse code. Is there any documentation on if SSE load/store instructions are somehow immune to this problem?

Thanks,
Evren

[Thomas_W_Intel]

Evren,

Unless you are using non-temporal stores, the behaviour for scalar and SSE loads is the same. Might it be that your data access pattern changed when you rewrote your code for SSE (e.g. a load and a store that were a multiple of 4k apart now have a different distance)?

Kind regards
Thomas