[PATCH] D124616: [TTI][X86] Fix splat-load cost when load+broadcast cannot be combined.

[Vasileios Porpodas via Phabricator via llvm-commits]

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This patch fixes the issue with the cost of a combined load+broadcast
when these cannot be combined into a single instruction.

For example, there may be other instructions in between:

  %ld = ...
  <other instructions>
  %vec = broadcast %ld ...

Or they may be in different bbs:
bb1:

  %ld = ...

bb2:

  %vec = broadcast %ld ...

This should fix cost modeling for SLP of such cases.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D124616

Files:
  llvm/lib/Target/X86/X86TargetTransformInfo.cpp
  llvm/test/Analysis/CostModel/X86/shuffle-load.ll

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