[PATCH] D61263: [X86][SSE] Fold scalar horizontal add/sub for non-0/1 element extractions

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: spatel, andreadb, craig.topper.
Herald added a project: LLVM.

We already perform horizontal add/sub if we extract from elements 0 and 1, this patch extends it to non-0/1 element extraction indices (as long as they are from the lowest 128-bit vector).


Repository:
  rL LLVM

https://reviews.llvm.org/D61263

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/haddsub.ll
  test/CodeGen/X86/phaddsub-extract.ll

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