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

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon updated this revision to Diff 153068.
RKSimon added a reviewer: efriedma.
RKSimon added a comment.

Refactored the patch to blend the special case values in at the end of the pow2 calculations.

I'll add the SignedMin case in a followup but I wanted to keep this patch focussed on the -1 divisor case.


Repository:
  rL LLVM

https://reviews.llvm.org/D45806

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

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