[PATCH] D20250: [ARM/AArch64] Match additional patterns to ldN instructions

[Matthew Simpson via llvm-commits]

mssimpso created this revision.
mssimpso added reviewers: jmolloy, rengolin.
mssimpso added subscribers: mcrosier, llvm-commits.
Herald added subscribers: rengolin, aemerson.

When matching an interleaved load to an ldN pattern, the interleaved access pass checks that all users of the load are shuffles. If the load is used by an instruction other than a shuffle, the pass gives up and an ldN is not generated. This patch considers users of the load that are extractelement instructions. It attempts to modify the extracts to use one of the available shuffles instead of the load. After the transformation, the load is only used by shuffles and will then be matched with an ldN pattern.


http://reviews.llvm.org/D20250

Files:
  lib/CodeGen/InterleavedAccessPass.cpp
  test/CodeGen/AArch64/aarch64-interleaved-accesses.ll
  test/CodeGen/ARM/arm-interleaved-accesses.ll

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