[PATCH] D115462: [SLP]Improve shuffles cost estimation where possible.

[Fangrui Song via Phabricator via llvm-commits]

MaskRay added a comment.
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Looks like cac60940b771a0685d058a5b471c84cea05fdc46 <https://reviews.llvm.org/rGcac60940b771a0685d058a5b471c84cea05fdc46> causes a miscompile again.
It causes https://github.com/pytorch/cpuinfo `src/x86/isa.c:cpuinfo_x86_detect_isa` to be miscompiled at least in `-O1 -fsanitize=memory` mode. The address of `isa` soon incorrectly becomes null:

  (gdb) p &isa
  $3 = (struct cpuinfo_x86_isa *) 0x0


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D115462/new/

https://reviews.llvm.org/D115462