ruapu

Detect cpu ISA features with single-file

CPU	✅ x86, x86-64 ✅ arm, aarch64	#define RUAPU_IMPLEMENTATION #include "ruapu.h" int main() { // initialize ruapu once ruapu_init(); // now, tell me if this cpu has avx2 int has_avx2 = ruapu_supports("avx2"); return 0; }
OS	✅ Windows ✅ Linux ✅ macOS ✅ Android ✅ iOS
Compiler	✅ GCC ✅ Clang ✅ MSVC ✅ MinGW

Let's ruapu

Compile ruapu test program # GCC / MinGW gcc main.c -o ruapu # Clang clang main.c -o ruapu # MSVC cl.exe /Fe: ruapu.exe main.c

Run ruapu in command line ./ruapu mmx = 1 sse = 1 sse2 = 1 sse3 = 1 ssse3 = 1 sse41 = 1 sse42 = 1 sse4a = 1 xop = 0 ... more lines omitted ...

Techniques inside ruapu

ruapu is implemented in C language to ensure the widest possible portability.

ruapu determines whether the CPU supports certain instruction sets by trying to execute instructions and detecting whether an Illegal Instruction exception occurs. ruapu does not rely on the cpuid instructions and registers related to the CPU architecture, nor does it rely on the MISA information and system calls of the operating system. This can help us get more detailed CPU ISA information.

• Detect vendor extended ISA, apple amx, risc-v vendor ISA, etc.
• Checking for richer isa on Windows ARM, IsProcessorFeaturePresent() can only get little ISA information
• Correctly detect x86-avx512 for macOS, macOS hides it in cpuid
• Detect new cpu's ISA on older systems, they are usually not exposed in auxv or MISA
• Detect CPU hidden ISA, x86-fma4 on zen1, ISA in hypervisor, etc.