[PATCH] D52195: [DAGCombiner][x86] add transform/hook to decompose integer multiply into shift/add

[Sanjay Patel via Phabricator via llvm-commits]

spatel updated this revision to Diff 165992.
spatel added a comment.

Patch updated:
A more conservative first step for x86 - don't do the transform if the vector multiply is legal (pmullw/pmulld). The remaining cases should always be clear improvements in speed and size.


https://reviews.llvm.org/D52195

Files:
  include/llvm/CodeGen/TargetLowering.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  test/CodeGen/X86/urem-seteq-vec-nonsplat.ll
  test/CodeGen/X86/urem-seteq-vec-splat.ll
  test/CodeGen/X86/vector-idiv-sdiv-128.ll
  test/CodeGen/X86/vector-idiv-sdiv-256.ll
  test/CodeGen/X86/vector-idiv-sdiv-512.ll
  test/CodeGen/X86/vector-idiv-udiv-128.ll
  test/CodeGen/X86/vector-idiv-udiv-256.ll
  test/CodeGen/X86/vector-idiv-udiv-512.ll
  test/CodeGen/X86/vector-mul.ll

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