[PATCH] D28508: [NVPTX] Implement NVPTXTargetLowering::getSqrtEstimate.

[Justin Lebar via Phabricator via llvm-commits]

jlebar updated this revision to Diff 86346.
jlebar added a comment.

Implement getSqrtEstimate API correctly.

Also lower approx sqrt(x) as x * rsqrt(x) when x is a double, since that was easy.


https://reviews.llvm.org/D28508

Files:
  llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp
  llvm/lib/Target/NVPTX/NVPTXISelLowering.h
  llvm/lib/Target/NVPTX/NVPTXInstrInfo.td
  llvm/test/CodeGen/NVPTX/fast-math.ll
  llvm/test/CodeGen/NVPTX/rsqrt.ll
  llvm/test/CodeGen/NVPTX/sqrt-approx.ll

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