Is it possible to vectorize atomic operation on MIC?

[Yuan_Y_]

Hi all,

I use gcc built-in function such as __sync_fetch_and_add in my program for atomic operations. Is it posibble to vectorize these atomic operations?

Thanks.

[jimdempseyatthecove]

__sync_fetch_and_add uses:

LOCK; XADD regValue, [location]

LOCK prefix is not supported for PADDB/PADDW/PADD
Additionally, the destination must be an XMM register.

You could use a CMPXCHG16B (or CMPXCHG8B) as a DCAS. This will get you partway to where you want to go.

Jim Dempsey