[PATCH] D45806: DAGcombiner: Handle correctly non-splat power of 2 -1 divisor

[Zvi Rackover via Phabricator via llvm-commits]

zvi created this revision.
zvi added reviewers: RKSimon, craig.topper, hfinkel.

The combine added in commit 329525 overlooked the case where
one, but not all, of the divisor elements is -1.
-1 is the only power of two value for which the sdiv expansion recipe
breaks.

Fixes pr37119


Repository:
  rL LLVM

https://reviews.llvm.org/D45806

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/combine-sdiv.ll

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