Use lookup table for Fp16 Tanh activation in hardware with SVE

Resolves: COMPMID-6901

Change-Id: Idcd3f5f5d90f4073aaf116c0586e46013fbd64f7
Signed-off-by: Gunes Bayir <gunes.bayir@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/11605
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Viet-Hoa Do <viet-hoa.do@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/arm_compute/function_info/ActivationLayerInfo.h b/arm_compute/function_info/ActivationLayerInfo.h
index 9390d0c54f..83b12d572e 100644
--- a/arm_compute/function_info/ActivationLayerInfo.h
+++ b/arm_compute/function_info/ActivationLayerInfo.h
@@ -121,6 +121,20 @@ public:
         _lut_fp16 = lut;
     }
 #endif // __aarch64__
+
+    // The < and == are added to be able to use this data type as an attribute for LUTInfo
+    friend bool operator<(const ActivationLayerInfo &l, const ActivationLayerInfo &r)
+    {
+        const auto l_tup = std::make_tuple(l._act, l._a, l._b, l._enabled);
+        const auto r_tup = std::make_tuple(r._act, r._a, r._b, r._enabled);
+
+        return l_tup < r_tup;
+    }
+    bool operator==(const ActivationLayerInfo &l) const
+    {
+        return this->_act == l._act && this->_a == l._a && this->_b == l._b && this->_enabled == l._enabled;
+    }
+
 private:
     ActivationFunction _act     = {ActivationLayerInfo::ActivationFunction::IDENTITY};
     float              _a       = {};