Merge pull request #1196 from labrinea/fmv

Create a learning path for Function Multiversioning.

Author: jasonrandrews

content/learning-paths/smartphones-and-mobile/function-multiversioning/_index.md

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+---
+title: Function Multiversioning
+
+minutes_to_complete: 30
+
+who_is_this_for: Developers who want to optimize their C/C++ applications across various Arm64 targets.
+
+learning_objectives:
+    - Take advantage of hardware features for tuning your applications at function level granularity.
+    - Create multiple versions of C/C++ functions for the targets you intend to run your applications on.
+    - Assist the compiler in generating better code for those targets, or provide your own optimized versions at the source level.
+    - Automatically select the most appropriate function version for your host target at runtime.
+    - Reuse your optimized application binaries across various targets.
+
+prerequisites:
+    - Basic knowledge of GNU function attributes. Familiarity with indirect functions (ifuncs) is a plus.
+    - Basic understanding of loop vectorization.
+    - Familiarity with Arm assembly.
+    - LLVM 19 compiler with runtime library support or GCC 14.
+
+author_primary: Arm
+
+### Tags
+skilllevels: Intermediate
+subjects: Tuning
+armips:
+    - Armv8
+    - Armv9
+tools_software_languages:
+    - C/C++
+operatingsystems:
+    - Linux
+    - Android
+    - macOS
+
+# ================================================================================
+#       FIXED, DO NOT MODIFY
+# ================================================================================
+weight: 1                       # _index.md always has weight of 1 to order correctly
+layout: "learningpathall"       # All files under learning paths have this same wrapper
+learning_path_main_page: "yes"  # This should be surfaced when looking for related content. Only set for _index.md of learning path content.
+---

content/learning-paths/smartphones-and-mobile/function-multiversioning/_next-steps.md

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+---
+next_step_guidance:
+
+recommended_path: /learning-paths/PLACEHOLDER_CATEGORY/PLACEHOLDER_LEARNING_PATH/
+
+further_reading:
+    - resource:
+        title: Arm C Language Extensions
+        link: https://arm-software.github.io/acle/main/acle.html
+        type: documentation
+
+# ================================================================================
+#       FIXED, DO NOT MODIFY
+# ================================================================================
+weight: 21                  # set to always be larger than the content in this path, and one more than 'review'
+title: "Next Steps"         # Always the same
+layout: "learningpathall"   # All files under learning paths have this same wrapper
+---

content/learning-paths/smartphones-and-mobile/function-multiversioning/_review.md

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+---
+review:
+    - questions:
+        question: >
+            What is the main benefit of Function Multiversioning?
+        answers:
+            - I may reuse my binaries on different targets without sacrificing runtime performance.
+            - My application binaries will be smaller in size.
+        correct_answer: 1
+        explanation: >
+            The produced binaries can be reused on different targets, but they may be larger in size.
+
+    - questions:
+        question: >
+            Can I implement versions of a function in separate translation units?
+        answers:
+            - Yes, function versions can spread across different translations units.
+            - No, all of them must be in the same translation unit.
+        correct_answer: 1
+        explanation: >
+            There is no requirement for function versions to be defined in the same translation unit. However, all of them must be declared in the translation unit which contains the definition of the default version.
+
+# ================================================================================
+#       FIXED, DO NOT MODIFY
+# ================================================================================
+title: "Review"                 # Always the same title
+weight: 20                      # Set to always be larger than the content in this path
+layout: "learningpathall"       # All files under learning paths have this same wrapper
+---