From 7467ba8fac0afb19d750b3bdda9ba95002634038 Mon Sep 17 00:00:00 2001
From: Mohammed Suhail Munshi <MohammedSuhail.Munshi@arm.com>
Date: Tue, 5 Dec 2023 14:27:31 +0000
Subject: Use look up table for fp16 activation

- Enables FP16 lut for logistic activation
- Adds LUTManager to re-use lut where appropriate.

Signed-off-by: Mohammed Suhail Munshi <MohammedSuhail.Munshi@arm.com>
Change-Id: I94667b63b452a8e58a1eb59cb0b5866178954523
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/10864
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Gunes Bayir <gunes.bayir@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>
---
 src/core/helpers/LUTManager.h | 73 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 src/core/helpers/LUTManager.h

(limited to 'src/core/helpers/LUTManager.h')

diff --git a/src/core/helpers/LUTManager.h b/src/core/helpers/LUTManager.h
new file mode 100644
index 0000000000..4e13ead7e3
--- /dev/null
+++ b/src/core/helpers/LUTManager.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2024 Arm Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef ACL_SRC_CORE_HELPERS_LUTMANAGER_H
+#define ACL_SRC_CORE_HELPERS_LUTMANAGER_H
+
+#include "arm_compute/core/CoreTypes.h"
+#include "arm_compute/core/QuantizationInfo.h"
+#include "arm_compute/function_info/ActivationLayerInfo.h"
+
+#include <map>
+#include <memory>
+
+namespace arm_compute
+{
+
+struct LUTInfo
+{
+    ActivationLayerInfo::ActivationFunction act;
+    DataType                                dt;
+    QuantizationInfo                        qinfo;
+    // Operators enable use of map with Lutinfo as key
+    friend bool operator<(const LUTInfo &l, const LUTInfo &r)
+    {
+        return (l.act < r.act) || ((l.act == r.act) && (l.dt < r.dt)) ||
+               ((l.act == r.act) && (l.dt == r.dt) && (l.qinfo.scale() < r.qinfo.scale())) ||
+               ((l.act == r.act) && (l.dt == r.dt) && (l.qinfo.scale() == r.qinfo.scale()) &&
+                (l.qinfo.offset() < l.qinfo.offset()));
+    }
+    bool operator==(const LUTInfo &l)
+    {
+        return this->act == l.act && this->dt == l.dt && this->qinfo == l.qinfo;
+    }
+};
+
+/* Class to handle getting look up table */
+class LUTManager
+{
+public:
+    LUTManager() = default;
+
+    static LUTManager &get_instance();
+#ifdef __aarch64__
+    std::shared_ptr<ActivationLayerInfo::LookupTable65536> get_lut_table(LUTInfo info);
+
+private:
+    std::map<LUTInfo, std::weak_ptr<ActivationLayerInfo::LookupTable65536>> map_fp16{};
+#endif // __aarch64__
+};
+
+} // namespace arm_compute
+#endif // ACL_SRC_CORE_HELPERS_LUTMANAGER_H
-- 
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