COMPMID-3069: Improve build time by splitting up ToolchainSupport.h

Split out the parts of ToolchainSupport coming from <memory> and
the parts coming from <string> into their own new header files.
This accounts for 99% of uses of ToolchainSupport, which means that
expensive header files such as arm_neon.h don't need to be included
everywhere.

Knocks about 10% of compilation time off kernel files.

Signed-off-by: Matthew Bentham <matthew.bentham@arm.com>
Change-Id: I2ae718fe766b5ff28608812b0f686f30eeac1b21
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/2852
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>

1 files changed, 114 insertions, 0 deletions

diff --git a/support/MemorySupport.h b/support/MemorySupport.h
new file mode 100644
index 0000000000..5ae5501371
--- /dev/null
+++ b/support/MemorySupport.h
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2017-2020 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 ARM_COMPUTE_SUPPORT_MEMORYSUPPORT
+#define ARM_COMPUTE_SUPPORT_MEMORYSUPPORT
+
+#include <memory>
+
+namespace arm_compute
+{
+namespace support
+{
+namespace cpp11
+{
+// std::align is missing in GCC 4.9
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57350
+inline void *align(std::size_t alignment, std::size_t size, void *&ptr, std::size_t &space)
+{
+    std::uintptr_t pn      = reinterpret_cast<std::uintptr_t>(ptr);
+    std::uintptr_t aligned = (pn + alignment - 1) & -alignment;
+    std::size_t    padding = aligned - pn;
+    if(space < size + padding)
+    {
+        return nullptr;
+    }
+
+    space -= padding;
+
+    return ptr = reinterpret_cast<void *>(aligned);
+}
+} //namespace cpp11
+namespace cpp14
+{
+/** make_unique is missing in CPP11. Re-implement it according to the standard proposal. */
+
+/**<Template for single object */
+template <class T>
+struct _Unique_if
+{
+    typedef std::unique_ptr<T> _Single_object; /**< Single object type */
+};
+
+/** Template for array */
+template <class T>
+struct _Unique_if<T[]>
+{
+    typedef std::unique_ptr<T[]> _Unknown_bound; /**< Array type */
+};
+
+/** Template for array with known bounds (to throw an error).
+ *
+ * @note this is intended to never be hit.
+ */
+template <class T, size_t N>
+struct _Unique_if<T[N]>
+{
+    typedef void _Known_bound; /**< Should never be used */
+};
+
+/** Construct a single object and return a unique pointer to it.
+ *
+ * @param[in] args Constructor arguments.
+ *
+ * @return a unique pointer to the new object.
+ */
+template <class T, class... Args>
+typename _Unique_if<T>::_Single_object
+make_unique(Args &&... args)
+{
+    return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
+}
+
+/** Construct an array of objects and return a unique pointer to it.
+ *
+ * @param[in] n Array size
+ *
+ * @return a unique pointer to the new array.
+ */
+template <class T>
+typename _Unique_if<T>::_Unknown_bound
+make_unique(size_t n)
+{
+    typedef typename std::remove_extent<T>::type U;
+    return std::unique_ptr<T>(new U[n]());
+}
+
+/** It is invalid to attempt to make_unique an array with known bounds. */
+template <class T, class... Args>
+typename _Unique_if<T>::_Known_bound
+make_unique(Args &&...) = delete;
+} // namespace cpp14
+} // namespace support
+} // namespace arm_compute
+#endif /* ARM_COMPUTE_SUPPORT_MEMORYSUPPORT */