At least for Android this may not be an option. It provides a
"cpufeatures" library for use at runtime. I suggest using a configure
option which explicitly enables this, and disable it otherwise.
On 01/12/2013 11:12 AM, Richard Henderson wrote:
On 01/12/2013 10:30 AM, Niels Möller wrote:
>Using Neon in a robust way might be a bit tricky, though. I have no
>idea how to determine if a CPU has Neon or not, and ARM has made most
>useful meta instructions supervisor-only.
For a start, I guess it could be a configure time option (with no
fat-binary things). Either explicit, or automatically based on, e.g.,
linux' /proc/cpuinfo which lists available cpu extensions.
Recent glibc has <sys/auxv.h> containing getauxval.
getauxval(AT_HWCAP) & HWCAP_ARM_NEON
gets you exactly the information you want.
r~
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