Hello Neon is an Android sample that uses ARM NEON for fir filter implementation:
- identify NEON files in source tree, they would be just normal c/c++ source files
- append -mfpu=neon to CMake compile flag for neon source files. This is different from android.mk, in that:
- *.c.neon is fake file name; cmake does not need that mechanism
If there are lot of NEON files in the project, make a NEON lib:
- turn NEON compile flags for the lib
- let the rest of the project use the NEON libs (this approach is not shown)
This sample uses the new Android Studio CMake plugin with C++ support.
- Android Studio 2.2+ with NDK bundle.
- Download Android Studio
- Launch Android Studio.
- Open the sample directory.
- Open File/Project Structure..., then click Download or Select NDK location.
- Click Build/Generate Signed APK to build release APK.
- Install your signed APK with adb install -r your-signed-apk.
- Run it on your target device
Notes:
- Build for release version(signed APK will do that) to view the performance numbers
- The performance number may vary with different platforms
- On x86 platforms, the purpose is to demo the neon code portability: neon performance number may not be better than that of the "C" version
If you've found an error in these samples, please file an issue.
Patches are encouraged, and may be submitted by forking this project and submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.
Copyright 2015 Google, Inc.
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http://www.apache.org/licenses/LICENSE-2.0
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