[PATCH] D29568: [DAGCombine] Allow vector constant folding of any value type before type legalization

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.

The patch comes in 2 parts:

1 - it makes use of the SelectionDAG::NewNodesMustHaveLegalTypes flag to tell it when it can safely constant fold illegal types

2 - it correctly resets SelectionDAG::NewNodesMustHaveLegalTypes at the start of each call to SelectionDAGISel::CodeGenAndEmitDAG so all the pre-legalization stages can make use of it - not just the first basic block that gets handled.

Fix for PR30760


Repository:
  rL LLVM

https://reviews.llvm.org/D29568

Files:
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
  test/CodeGen/X86/vector-lzcnt-128.ll
  test/CodeGen/X86/vector-lzcnt-256.ll
  test/CodeGen/X86/vector-tzcnt-128.ll
  test/CodeGen/X86/vector-tzcnt-256.ll

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