[PATCH] D64551: [X86] EltsFromConsecutiveLoads - support common source loads

[Simon Pilgrim via Phabricator via llvm-commits]

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

This patch enables us to find the source loads for each element, splitting them into a Load and ByteOffset, and attempts to recognise consecutive loads that are in fact from the same source load.

A helper function, FindEltLoadSrc, recurses through to find a LoadSDNode and determines the element's byte offset within it. When attempting to match consecutive loads, byte offsetted loads then attempt to matched against a previous load that has already been confirmed to be a consecutive match.

Next step towards PR16739 - after this we just need to account for shuffling/repeated elements to create a vector load + shuffle.


Repository:
  rL LLVM

https://reviews.llvm.org/D64551

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/clear_upper_vector_element_bits.ll
  test/CodeGen/X86/load-partial.ll

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