[PATCH] D59041: [SDAG][X86] Expand pow2 mulo using shifts

[Nikita Popov via Phabricator via llvm-commits]

nikic created this revision.
nikic added reviewers: RKSimon, spatel.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a project: LLVM.

Expand MULO with constant power of two operand to a shift. The overflow is checked with (x << shift) >> shift == x.


Repository:
  rL LLVM

https://reviews.llvm.org/D59041

Files:
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/test/CodeGen/X86/mulo-pow2.ll

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