From b292e58ee458c56be189196305a099b7e60ee623 Mon Sep 17 00:00:00 2001
From: John Wellbelove <jwellbelove@users.noreply.github.com>
Date: Mon, 25 Oct 2021 14:01:07 +0100
Subject: [PATCH] Experimental automatic builtins for algorithms

---
 .../etl/profiles/determine_builtin_support.h  | 92 ++++++++++++++++---
 1 file changed, 78 insertions(+), 14 deletions(-)

diff --git a/include/etl/profiles/determine_builtin_support.h b/include/etl/profiles/determine_builtin_support.h
index ad16a70d..39f22d29 100644
--- a/include/etl/profiles/determine_builtin_support.h
+++ b/include/etl/profiles/determine_builtin_support.h
@@ -31,7 +31,48 @@ SOFTWARE.
 #ifndef ETL_DETERMINE_BUILTIN_SUPPORT_H_INCLUDED
 #define ETL_DETERMINE_BUILTIN_SUPPORT_H_INCLUDED
 
-#if defined(__has_builtin)
+#if defined(ETL_USE_MEM_BUILTINS) // Set all of them to be true if not already defined
+
+  #if !defined(ETL_USE_BUILTIN_MEMCMP)
+    #define ETL_USE_BUILTIN_MEMCMP 1
+  #endif
+
+  #if !defined(ETL_USE_BUILTIN_MEMMOVE)
+    #define ETL_USE_BUILTIN_MEMMOVE 1
+  #endif
+
+  #if !defined(ETL_USE_BUILTIN_MEMSET)
+    #define ETL_USE_BUILTIN_MEMSET 1
+  #endif
+
+#endif
+
+#if defined(ETL_USE_TYPE_TRAITS_BUILTINS) // Set all of them to be true if not already defined
+
+  #if !defined(ETL_USE_BUILTIN_IS_ASSIGNABLE)
+    #define ETL_USE_BUILTIN_IS_ASSIGNABLE 1
+  #endif
+
+  #if !defined(ETL_USE_BUILTIN_IS_CONSTRUCTIBLE)
+    #define ETL_USE_BUILTIN_IS_CONSTRUCTIBLE 1
+  #endif
+
+  #if !defined(ETL_USE_BUILTIN_IS_TRIVIALLY_CONSTRUCTIBLE)
+    #define ETL_USE_BUILTIN_IS_TRIVIALLY_CONSTRUCTIBLE 1
+  #endif
+
+  #if !defined(ETL_USE_BUILTIN_IS_TRIVIALLY_DESTRUCTIBLE)
+    #define ETL_USE_BUILTIN_IS_TRIVIALLY_DESTRUCTIBLE 1
+  #endif
+
+  #if !defined(ETL_USE_BUILTIN_IS_TRIVIALLY_COPYABLE)
+    #define ETL_USE_BUILTIN_IS_TRIVIALLY_COPYABLE 1
+  #endif
+
+#endif
+
+#if defined(__has_builtin) && (!defined(ETL_USE_MEM_BUILTINS) || !defined(ETL_USE_TYPE_TRAITS_BUILTINS)) // Use __has_builtin to check for existence of builtin functions, if not already defined
+
   #if !defined(ETL_USE_BUILTIN_MEMCMP)
     #define ETL_USE_BUILTIN_MEMCMP  __has_builtin(__builtin_memcmp)
   #endif
@@ -48,24 +89,26 @@ SOFTWARE.
     #define ETL_USE_BUILTIN_IS_ASSIGNABLE __has_builtin(__is_assignable)
   #endif
 
-#if !defined(ETL_USE_BUILTIN_IS_CONSTRUCTIBLE)
-  #define ETL_USE_BUILTIN_IS_CONSTRUCTIBLE __has_builtin(__is_constructible)
-#endif
+  #if !defined(ETL_USE_BUILTIN_IS_CONSTRUCTIBLE)
+    #define ETL_USE_BUILTIN_IS_CONSTRUCTIBLE __has_builtin(__is_constructible)
+  #endif
 
-#if !defined(ETL_USE_BUILTIN_IS_TRIVIALLY_CONSTRUCTIBLE)
-  #define ETL_USE_BUILTIN_IS_TRIVIALLY_CONSTRUCTIBLE (__has_builtin(__has_trivial_constructor) || __has_builtin(__is_trivially_constructible))
-#endif
+  #if !defined(ETL_USE_BUILTIN_IS_TRIVIALLY_CONSTRUCTIBLE)
+    #define ETL_USE_BUILTIN_IS_TRIVIALLY_CONSTRUCTIBLE (__has_builtin(__has_trivial_constructor) || __has_builtin(__is_trivially_constructible))
+  #endif
 
+  #if !defined(ETL_USE_BUILTIN_IS_TRIVIALLY_DESTRUCTIBLE)
+    #define ETL_USE_BUILTIN_IS_TRIVIALLY_DESTRUCTIBLE (__has_builtin(__has_trivial_destructor) || __has_builtin(__is_trivially_destructible))
+  #endif
 
-__has_trivial_destructor
-__is_trivially_destructible
+  #if !defined(ETL_USE_BUILTIN_IS_TRIVIALLY_COPYABLE)
+    #define ETL_USE_BUILTIN_IS_TRIVIALLY_COPYABLE (__has_builtin(__has_trivial_copy) || __has_builtin(__is_trivially_copyable))
+  #endif
 
-__has_trivial_copy
-__is_trivially_copyable
+#if !defined(__has_builtin) && !defined(ETL_USE_MEM_BUILTINS) && !defined(ETL_USE_TYPE_TRAITS_BUILTINS) // Set all of them to be false if not already defined
 
-#else
   #if !defined(ETL_USE_BUILTIN_MEMCMP)
-    #define ETL_USE_BUILTIN_MEMCMP  0
+    #define ETL_USE_BUILTIN_MEMCMP 0
   #endif
 
   #if !defined(ETL_USE_BUILTIN_MEMMOVE)
@@ -73,8 +116,29 @@ __is_trivially_copyable
   #endif
 
   #if !defined(ETL_USE_BUILTIN_MEMSET)
-    #define ETL_USE_BUILTIN_MEMSET  0
+    #define ETL_USE_BUILTIN_MEMSET 0
   #endif
+
+  #if !defined(ETL_USE_BUILTIN_IS_ASSIGNABLE)
+    #define ETL_USE_BUILTIN_IS_ASSIGNABLE 0
+  #endif
+
+  #if !defined(ETL_USE_BUILTIN_IS_CONSTRUCTIBLE)
+    #define ETL_USE_BUILTIN_IS_CONSTRUCTIBLE 0
+  #endif
+
+  #if !defined(ETL_USE_BUILTIN_IS_TRIVIALLY_CONSTRUCTIBLE)
+    #define ETL_USE_BUILTIN_IS_TRIVIALLY_CONSTRUCTIBLE 0
+  #endif
+
+  #if !defined(ETL_USE_BUILTIN_IS_TRIVIALLY_DESTRUCTIBLE)
+    #define ETL_USE_BUILTIN_IS_TRIVIALLY_DESTRUCTIBLE 0
+  #endif
+
+  #if !defined(ETL_USE_BUILTIN_IS_TRIVIALLY_COPYABLE)
+    #define ETL_USE_BUILTIN_IS_TRIVIALLY_COPYABLE 0
+  #endif
+
 #endif
 
 #endif