[PATCH] D48193: [LoopVectorizer] Use an interleave count of 1 when using a vector library call

[Hideki Saito via Phabricator via llvm-commits]

hsaito added a comment.

I see this as a register allocator problem. It's not like we are running out of registers so that we cannot use ymm0 as a "scratch register" for SVML call. We should show the ASM code to CG experts and get the problem fixed there.

Assuming that register allocator can fix simple enough issues..... I don't think it's correct to model this as a VECLIB call problem. It can happen to any function call that use too many registers that can't be shared among interleaved calls. Instead of looking at whether it's a VECLIB call or not, we should be checking how many registers are used for call/return, and how many of them cannot be shared among interleaved calls. We can then formulate this into a general register pressure issue.


Repository:
  rL LLVM

https://reviews.llvm.org/D48193