[PATCH] D34458: [TTI] Refine the cost of EXT in getUserCost()

[Elena Demikhovsky via Phabricator via llvm-commits]

delena added a comment.

I dug into the performance degradation and found that isExtLoad() reduces cost of a loop, as a result the loop is being unrolled. Unrolling this loop causes performance degradation.
But the load + zext cost is correct and it is 1 Op. I'll work more with our architects in order to understand what parameter is incorrect on X86.


Repository:
  rL LLVM

https://reviews.llvm.org/D34458