[PATCH] D48975: [DAG] Support non-uniform X%C -> X-(X/C)*C folds

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: spatel, lebedev.ri, efriedma, craig.topper.

First stage in PR38057 - support non-uniform constant vectors in the combine to reuse the division-by-constant logic.

We can definitely do better for srem pow2 remainders (and avoid that extra multiply....) but this at least helps keep everything on the vector unit.


Repository:
  rL LLVM

https://reviews.llvm.org/D48975

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

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