[PATCH] D56719: [DAGCombine] Enable more pre-indexed stores

Tue Jan 15 06:57:50 PST 2019

samparker created this revision.
samparker added reviewers: lattner, sunfish.
Herald added subscribers: arphaman, javed.absar.

The DAG combiner previously would not produce a pre-indexed store if the base pointer was a predecessor of the value being stored, so to prevent a cycle in the DAG. However, we could produce a pre-inc store if the store is final use of base pointer.

https://reviews.llvm.org/D56719

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/ARM/dsp-loop-indexing.ll
  test/CodeGen/ARM/loop-indexing.ll
  test/CodeGen/ARM/pre-inc-store.ll

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