[PATCH] D12561: [X86][SSE] Match zero/any extension shuffles that don't start from the first element

[Quentin Colombet via llvm-commits]

qcolombet accepted this revision.
qcolombet added a comment.
This revision is now accepted and ready to land.

> Regarding the tests - the over use of PSHUFB can be a performance issue - you often have to load the shuffle mask (>5cy) and many targets (AMD + Intel) have a poor latency/throughput executing it (>icy).


Ah, that’s the catch, loading the mask! From the diff that wasn’t clear since we do not see the actual operands.

Alright, LGTM then!

Thanks,
-Quentin


Repository:
  rL LLVM

http://reviews.llvm.org/D12561