Hanhan Wang 9cb10296ec [mlir] Add support for lowering tanh to LLVMIR. ...

Summary:
Fixed build of D81618

Add a pattern for expanding tanh op into exp form.
A `tanh` is expanded into:
   1) 1-exp^{-2x} / 1+exp^{-2x}, if x => 0
   2) exp^{2x}-1 / exp^{2x}+1  , if x < 0.

Differential Revision: https://reviews.llvm.org/D82040

2020-06-18 10:42:13 -07:00

2.7 KiB

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