fix ftanh

Author: bratpiorka

llvm/lib/Target/NVPTX/NVPTXInstrInfo.td

@@ -1242,6 +1242,19 @@ def TANH_APPROX_f16x2 :
                  [(set v2f16:$dst, (int_nvvm_tanh_approx_f16x2 v2f16:$src))]>,
                  Requires<[hasPTX<70>, hasSM<75>]>;
 
+// Patterns for ftanh SDNode
+def : Pat<(f32 (UnaryOpAllowsApproxFn<ftanh> f32:$src)),
+          (TANH_APPROX_f32 f32:$src)>,
+      Requires<[hasPTX<70>, hasSM<75>]>;
+
+def : Pat<(f16 (UnaryOpAllowsApproxFn<ftanh> f16:$src)),
+          (TANH_APPROX_f16 f16:$src)>,
+      Requires<[hasPTX<70>, hasSM<75>]>;
+
+def : Pat<(v2f16 (UnaryOpAllowsApproxFn<ftanh> v2f16:$src)),
+          (TANH_APPROX_f16x2 v2f16:$src)>,
+      Requires<[hasPTX<70>, hasSM<75>]>;
+
 //-----------------------------------
 // Bitwise operations
 //-----------------------------------