Detecting FPU presence on Android

Question

I want to get the most performance of my mobile application on Android. I would like to know if someone is aware of a trick to check if the phone possesses an FPU.

A

Answer 1

Even though it is a very old thread, for anyone like me landed here by google may find this useful. Here I am showing how we can do it using NDK (C++) as the Java-way is already given.

Using NDK, by including cpu-features.h, we can utilize a number of API and predefined macros to detect the availability of FPU.

For 32 bit processor, you should check one of ANDROID_CPU_ARM_FEATURE_VFPv3, ANDROID_CPU_ARM_FEATURE_VFPv2, ANDROID_CPU_ARM_FEATURE_VFP_D32, ANDROID_CPU_ARM_FEATURE_VFP_FP16 or ANDROID_CPU_ARM_FEATURE_VFP_FMA on the return value of android_getCpuFeatures() which will ensure that your processor is armed with an FPU.

For 64 bit, please check ANDROID_CPU_ARM64_FEATURE_FP flag.

Additionally, call android_getCpuFamily() to get CPU family/architecture (ARM/MIPS, 32/64 bit etc).

The cpufeatures library manual has everything to include and use it in your project.