[PATCH] D57434: Optimize pow(X, 0.75) to sqrt(X) * sqrt(sqrt(X))

[Whitney via Phabricator via llvm-commits]

Whitney created this revision.
Whitney added reviewers: t.p.northover, javed.absar, evandro, fhahn, efriedma, lebedev.ri.
Herald added subscribers: llvm-commits, jsji, hiraditya, nemanjai.

There already exists an optimization which try to convert pow(X, 0.25) to sqrt(sqrt(x)). This patch extends it with pow(X, 0.75).


Repository:
  rL LLVM

https://reviews.llvm.org/D57434

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/ARM/pow.75.ll
  llvm/test/CodeGen/PowerPC/pow.75.ll
  llvm/test/CodeGen/X86/pow.75.ll

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