90 lines
2.1 KiB
Markdown
90 lines
2.1 KiB
Markdown
# ruapu
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Detect cpu ISA features with single-file
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<table>
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<tr><td>CPU</td><td>✅ x86, x86-64<br/>✅ arm, aarch64</td><td rowspan=3>
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```c
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#define RUAPU_IMPLEMENTATION
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#include "ruapu.h"
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int main()
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{
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// initialize ruapu once
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ruapu_init();
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// now, tell me if this cpu has avx2
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int has_avx2 = ruapu_supports("avx2");
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return 0;
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}
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```
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</td></tr>
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<tr><td>OS</td><td>✅ Windows<br/>✅ Linux<br/>✅ macOS<br/>✅ Android<br/>✅ iOS</td></tr>
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<tr><td>Compiler</td><td>✅ GCC<br/>✅ Clang<br/>✅ MSVC<br/>✅ MinGW</td></tr>
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</table>
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## Let's ruapu
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<table>
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<tr><td>
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Compile ruapu test program
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```shell
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# GCC / MinGW
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gcc main.c -o ruapu
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```
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```shell
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# Clang
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clang main.c -o ruapu
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```
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```shell
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# MSVC
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cl.exe /Fe: ruapu.exe main.c
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```
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</td>
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<td>
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Run ruapu in command line
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```shell
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./ruapu
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mmx = 1
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sse = 1
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sse2 = 1
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sse3 = 1
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ssse3 = 1
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sse41 = 1
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sse42 = 1
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sse4a = 1
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xop = 0
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... more lines omitted ...
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```
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</td></tr>
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</table>
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## Features
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* Detect **CPU ISA with single-file**   
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_`x86-sse2`, `x86-avx`, `x86-avx512f`, `arm-neon`, etc._
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* Detect **vendor extended ISA**    
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_apple `amx`, risc-v vendor ISA, etc._
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* Detect **richer ISA on Windows ARM**  
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_`IsProcessorFeaturePresent()` returns little ISA information_
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* Detect **`x86-avx512` on macOS correctly** 
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_macOS hides it in `cpuid`_
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* Detect **new CPU's ISA on old systems** 
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_they are usually not exposed in `auxv` or `MISA`_
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* Detect **CPU hidden ISA**       
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_`x86-fma4` on zen1, ISA in hypervisor, etc._
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## Techniques inside ruapu
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ruapu is implemented in C language to ensure the widest possible portability.
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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.
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