问题描述
我想在 Android 上获得我的移动应用程序的最大性能.我想知道是否有人知道检查手机是否具有 FPU 的技巧.
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.
经过一些研究，似乎在拥有 FPU 的单元上使用 FloatMath 类会比较慢，所以我想两全其美.
After some research it seems that using FloatMath class is slower on a unit that possesses an FPU, so I would like to have best of both worlds.
大多数较新的手机都有 FPU，但我希望获得设备所能提供的最佳性能.
Most newer phones have an FPU, but I would like to get the most performance the device can offer.
推荐答案
底层是 Linux 内核，至少 Android 的默认配置会挂载 procfs.这意味着您可以查看 /proc/cpuinfo，它在 ARM 系统上类似于:
It's a Linux kernel underneath, and at least the default Android configuration will mount procfs. That means you can look into /proc/cpuinfo, which on an ARM system looks something like:
# cat /proc/cpuinfo
Processor : ARMv7 Processor rev 3 (v7l)
BogoMIPS : 249.96
Features : swp half thumb fastmult vfp edsp neon vfpv3
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x1
CPU part : 0xc08
CPU revision : 3
[ ... ]
如果Features"行至少列出了 vfp，则 ARM SoC 具有 FPU.
If the "Features" line lists at least vfp, then the ARM SoC has an FPU.
您应该能够通过 Dalvik/Java 接口读取 /proc/cpuinfo，就像普通文件一样，无需特权访问或任何需要.我不是 Java 程序员，因此将其作为练习留给读者.
You should be able to read /proc/cpuinfo via Dalvik/Java interfaces, just like a normal file, no privileged access or anything required. I'm not a Java programmer, so leaving that as an exercise to the reader.
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