[PATCH] D58884: [DAGCombiner][X86][SystemZ][AArch64] Combine some cases of (bitcast (build_vector constants)) between legalize types and legalize dag.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: RKSimon, spatel.
Herald added subscribers: kristof.beyls, javed.absar.
Herald added a project: LLVM.

This patch enables combining integer bitcasts of integer build vectors when the new scalar type is legal. I've avoided floating point because the implementation bitcasts float to int along the way and we would need to check the intermediate types for legality.


Repository:
  rL LLVM

https://reviews.llvm.org/D58884

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/AArch64/fold-constants.ll
  test/CodeGen/SystemZ/vec-extract-01.ll
  test/CodeGen/X86/memcmp-optsize.ll
  test/CodeGen/X86/memcmp.ll
  test/CodeGen/X86/vec_insert-7.ll
  test/CodeGen/X86/vec_zero_cse.ll
  test/CodeGen/X86/vector-shift-ashr-sub128.ll
  test/CodeGen/X86/vector-shift-lshr-sub128.ll
  test/CodeGen/X86/vector-shift-shl-sub128.ll
  test/CodeGen/X86/vselect-avx.ll
  test/CodeGen/X86/widen_arith-4.ll
  test/CodeGen/X86/widen_arith-5.ll
  test/CodeGen/X86/widen_cast-1.ll
  test/CodeGen/X86/widen_shuffle-1.ll

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