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85e8c09ff6
Neither GCC nor Clang define an __arm64__ preprocessor macro, but use __aarch64__ (MSVC uses _MARM_64). Add a "64" suffix to the define, i.e. NETGEN_ARCH_ARM64 to make it more obvious in only refers to aarch64, and to be in line with NETGEN_ARCH_AMD64. Replace the (Clang specific) __builtin_readcyclecounter with inline asm: - The function return cycles (i.e. varies with CPU frequency), not time - It may return 0, depending on the PMU settings - It may cause an illegal instruction, in case it is not trapped by the kernel, e.g. on FreeBSD. Reading the generic timer/counter CNTVCT_EL0 instead of PMCCNTR_EL0 avoids these pitfalls. The inline asm works on GCC and Clang, instead of Clang only for the builtin.
Netgen mesh generator
NETGEN is an automatic 3d tetrahedral mesh generator. It accepts input from constructive solid geometry (CSG) or boundary representation (BRep) from STL file format. The connection to a geometry kernel allows the handling of IGES and STEP files. NETGEN contains modules for mesh optimization and hierarchical mesh refinement. Netgen 6.x supports scripting via a Python interface. Netgen is open source based on the LGPL license. It is available for Unix/Linux, Windows, and OSX.