[PATCH] D30710: [LV] Vectorize GEPs

[Matthew Simpson via Phabricator via llvm-commits]

mssimpso updated this revision to Diff 90940.
mssimpso added a comment.

Re-implemented the widening, as previously mentioned.

- Removed the Legal->isUniform() case. Now, I just let the IRBuilder return a scalar GEP if all the operands are loop-invariant. If the result is scalar, I do the broadcast.
- The above change exposes a likely bug in fixFirstOrderRecurrences, so I've fixed that as well. The IRBuilder constant-folded the GEP in first-order-recurrences.ll away. The problematic code assumes that an instruction in the old loop will map to an instruction in the new loop. The is probably not a safe assumption in general.


https://reviews.llvm.org/D30710

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/AArch64/first-order-recurrence.ll
  test/Transforms/LoopVectorize/X86/consecutive-ptr-uniforms.ll
  test/Transforms/LoopVectorize/X86/scatter_crash.ll

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