[PATCH] D16649: [AArch64] Custom lower some extloads

[Matthew Simpson via llvm-commits]

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

This patch adds custom lowering for sign- and any-extended loads of v2i8, v4i8 and v2i16. Instead of generating multiple loads followed by vector inserts, we now generate a single scalar load followed by a vector shuffle. This works was adapted from r213897 (the corresponding patch for the X86 target).

http://reviews.llvm.org/D16649

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  test/CodeGen/AArch64/neon-truncStore-extLoad.ll

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