[PATCH] D12197: [DAGCombiner] Fold together mul and shl when both are by a constant

[John Brawn via llvm-commits]

john.brawn created this revision.
john.brawn added reviewers: t.p.northover, rengolin, resistor.
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This is intended to improve code generation for GEPs, as the index value is shifted by the element size and in GEPs of multi-dimensional arrays the index of higher dimensions is multiplied by the lower dimension size.

Repository:
  rL LLVM

http://reviews.llvm.org/D12197

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/ARM/gep-optimization.ll

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