From 35ceeb2199c569810a1524a0a21c2df2a3f5f29e Mon Sep 17 00:00:00 2001
From: Diego Lopez Recas <Diego.LopezRecas@arm.com>
Date: Mon, 4 Dec 2017 18:56:10 +0000
Subject: IVGCVSW-798 Add Softmax NEON support for QASYMM8

Change-Id: I4f2cca52caf210fdb7d6bb7e9436ac51cb5088b4
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/112398
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
---
 arm_compute/core/utils/misc/utility.h | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

(limited to 'arm_compute/core/utils/misc/utility.h')

diff --git a/arm_compute/core/utils/misc/utility.h b/arm_compute/core/utils/misc/utility.h
index 45b3b5268e..e8d823b5bc 100644
--- a/arm_compute/core/utils/misc/utility.h
+++ b/arm_compute/core/utils/misc/utility.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 ARM Limited.
+ * Copyright (c) 2017-2018 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -25,6 +25,7 @@
 #define __ARM_COMPUTE_MISC_UTILITY_H__
 
 #include <array>
+#include <limits>
 
 namespace arm_compute
 {
@@ -123,6 +124,22 @@ inline auto foldl(F &&func, T &&initial, U &&value, Us &&... values) -> decltype
 {
     return foldl(std::forward<F>(func), func(std::forward<T>(initial), std::forward<U>(value)), std::forward<Us>(values)...);
 }
+
+/** Type cast with saturation.
+ *
+ * @param[in] val Value of type U to cast.
+ *
+ * @return Original value clamped to numeric limits of T and converted to type T.
+ *
+ * @warning Numeric limits of T must be representable without loss in type U.
+ */
+template <typename T, typename U>
+T saturate_cast(U val)
+{
+    const auto low  = static_cast<U>(std::numeric_limits<T>::lowest());
+    const auto high = static_cast<U>(std::numeric_limits<T>::max());
+    return static_cast<T>(clamp(val, low, high));
+}
 } // namespace utility
 } // namespace arm_compute
 #endif /* __ARM_COMPUTE_MISC_UTILITY_H__ */
-- 
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