283 lines
15 KiB
Markdown
283 lines
15 KiB
Markdown
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# cpu_features
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A cross-platform C library to retrieve CPU features (such as available
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instructions) at runtime.
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# GitHub-CI Status
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[comment]: <> (The following lines are generated by "scripts/generate_badges.d" that you can run online https://run.dlang.io/)
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| | Linux | FreeBSD | MacOS | Windows |
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| :-- | --: | --: | --: | --: |
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| amd64 | [![CMake][i1a0]][l1a0]<br/>[![Bazel][i1a1]][l1a1] | [![CMake][i2a0]][l2a0]<br/>![Bazel][d1] | [![CMake][i3a0]][l3a0]<br/>[![Bazel][i3a1]][l3a1] | [![CMake][i4a0]][l4a0]<br/>![Bazel][d1] |
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| AArch64 | [![CMake][i1b0]][l1b0]<br/>[![Bazel][i1b1]][l1b1] | ![CMake][d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] |
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| ARM | [![CMake][i1c0]][l1c0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] |
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| MIPS | [![CMake][i1d0]][l1d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] |
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| POWER | [![CMake][i1e0]][l1e0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] |
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| RISCV | [![CMake][i1f0]][l1f0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] |
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| LOONGARCH | ![CMake][d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] |
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| s390x | [![CMake][i1h0]][l1h0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] | ![CMake][d0]<br/>![Bazel][d1] |
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[d0]: https://img.shields.io/badge/n%2Fa-lightgrey?&logo=cmake
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[d1]: https://img.shields.io/badge/n%2Fa-lightgrey?&logo=data:image/svg%2bxml;base64,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[i1a0]: https://img.shields.io/github/actions/workflow/status/google/cpu_features/amd64_linux_cmake.yml?branch=main&event=push&label=&logo=cmake
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[i1a1]: https://img.shields.io/github/actions/workflow/status/google/cpu_features/amd64_linux_bazel.yml?branch=main&event=push&label=&logo=data:image/svg%2bxml;base64,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[i1b0]: https://img.shields.io/github/actions/workflow/status/google/cpu_features/aarch64_linux_cmake.yml?branch=main&event=push&label=&logo=cmake
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[i1b1]: https://img.shields.io/github/actions/workflow/status/google/cpu_features/aarch64_linux_bazel.yml?branch=main&event=push&label=&logo=data:image/svg%2bxml;base64,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[i1c0]: https://img.shields.io/github/actions/workflow/status/google/cpu_features/arm_linux_cmake.yml?branch=main&event=push&label=&logo=cmake
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[i1d0]: https://img.shields.io/github/actions/workflow/status/google/cpu_features/mips_linux_cmake.yml?branch=main&event=push&label=&logo=cmake
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[i1e0]: https://img.shields.io/github/actions/workflow/status/google/cpu_features/power_linux_cmake.yml?branch=main&event=push&label=&logo=cmake
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[i1f0]: https://img.shields.io/github/actions/workflow/status/google/cpu_features/riscv_linux_cmake.yml?branch=main&event=push&label=&logo=cmake
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[i1h0]: https://img.shields.io/github/actions/workflow/status/google/cpu_features/s390x_linux_cmake.yml?branch=main&event=push&label=&logo=cmake
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[i2a0]: https://img.shields.io/github/actions/workflow/status/google/cpu_features/amd64_freebsd_cmake.yml?branch=main&event=push&label=&logo=cmake
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[i3a0]: https://img.shields.io/github/actions/workflow/status/google/cpu_features/amd64_macos_cmake.yml?branch=main&event=push&label=&logo=cmake
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[i3a1]: https://img.shields.io/github/actions/workflow/status/google/cpu_features/amd64_macos_bazel.yml?branch=main&event=push&label=&logo=data:image/svg%2bxml;base64,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[i4a0]: https://img.shields.io/github/actions/workflow/status/google/cpu_features/amd64_windows_cmake.yml?branch=main&event=push&label=&logo=cmake
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[l1a0]: https://github.com/google/cpu_features/actions/workflows/amd64_linux_cmake.yml
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[l1a1]: https://github.com/google/cpu_features/actions/workflows/amd64_linux_bazel.yml
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[l1b0]: https://github.com/google/cpu_features/actions/workflows/aarch64_linux_cmake.yml
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[l1b1]: https://github.com/google/cpu_features/actions/workflows/aarch64_linux_bazel.yml
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[l1c0]: https://github.com/google/cpu_features/actions/workflows/arm_linux_cmake.yml
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[l1d0]: https://github.com/google/cpu_features/actions/workflows/mips_linux_cmake.yml
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[l1e0]: https://github.com/google/cpu_features/actions/workflows/power_linux_cmake.yml
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[l1f0]: https://github.com/google/cpu_features/actions/workflows/riscv_linux_cmake.yml
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[l1h0]: https://github.com/google/cpu_features/actions/workflows/s390x_linux_cmake.yml
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[l2a0]: https://github.com/google/cpu_features/actions/workflows/amd64_freebsd_cmake.yml
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[l3a0]: https://github.com/google/cpu_features/actions/workflows/amd64_macos_cmake.yml
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[l3a1]: https://github.com/google/cpu_features/actions/workflows/amd64_macos_bazel.yml
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[l4a0]: https://github.com/google/cpu_features/actions/workflows/amd64_windows_cmake.yml
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## Table of Contents
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- [Design Rationale](#rationale)
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- [Code samples](#codesample)
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- [Running sample code](#usagesample)
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- [What's supported](#support)
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- [Android NDK's drop in replacement](#ndk)
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- [License](#license)
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- [Build with cmake](#cmake)
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- [Community Bindings](#bindings)
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<a name="rationale"></a>
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## Design Rationale
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- **Simple to use.** See the snippets below for examples.
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- **Extensible.** Easy to add missing features or architectures.
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- **Compatible with old compilers** and available on many architectures so it
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can be used widely. To ensure that cpu_features works on as many platforms
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as possible, we implemented it in a highly portable version of C: C99.
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- **Sandbox-compatible.** The library uses a variety of strategies to cope
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with sandboxed environments or when `cpuid` is unavailable. This is useful
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when running integration tests in hermetic environments.
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- **Thread safe, no memory allocation, and raises no exceptions.**
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cpu_features is suitable for implementing fundamental libc functions like
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`malloc`, `memcpy`, and `memcmp`.
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- **Unit tested.**
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<a name="codesample"></a>
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## Code samples
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**Note:** For C++ code, the library functions are defined in the `cpu_features` namespace.
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### Checking features at runtime
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Here's a simple example that executes a codepath if the CPU supports both the
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AES and the SSE4.2 instruction sets:
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```c
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#include "cpuinfo_x86.h"
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// For C++, add `using namespace cpu_features;`
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static const X86Features features = GetX86Info().features;
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void Compute(void) {
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if (features.aes && features.sse4_2) {
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// Run optimized code.
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} else {
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// Run standard code.
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}
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}
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```
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### Caching for faster evaluation of complex checks
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If you wish, you can read all the features at once into a global variable, and
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then query for the specific features you care about. Below, we store all the ARM
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features and then check whether AES and NEON are supported.
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```c
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#include <stdbool.h>
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#include "cpuinfo_arm.h"
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// For C++, add `using namespace cpu_features;`
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static const ArmFeatures features = GetArmInfo().features;
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static const bool has_aes_and_neon = features.aes && features.neon;
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// use has_aes_and_neon.
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```
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This is a good approach to take if you're checking for combinations of features
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when using a compiler that is slow to extract individual bits from bit-packed
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structures.
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### Checking compile time flags
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The following code determines whether the compiler was told to use the AVX
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instruction set (e.g., `g++ -mavx`) and sets `has_avx` accordingly.
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```c
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#include <stdbool.h>
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#include "cpuinfo_x86.h"
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// For C++, add `using namespace cpu_features;`
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static const X86Features features = GetX86Info().features;
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static const bool has_avx = CPU_FEATURES_COMPILED_X86_AVX || features.avx;
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// use has_avx.
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```
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`CPU_FEATURES_COMPILED_X86_AVX` is set to 1 if the compiler was instructed to
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use AVX and 0 otherwise, combining compile time and runtime knowledge.
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### Rejecting poor hardware implementations based on microarchitecture
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On x86, the first incarnation of a feature in a microarchitecture might not be
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the most efficient (e.g. AVX on Sandy Bridge). We provide a function to retrieve
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the underlying microarchitecture so you can decide whether to use it.
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Below, `has_fast_avx` is set to 1 if the CPU supports the AVX instruction
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set—but only if it's not Sandy Bridge.
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```c
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#include <stdbool.h>
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#include "cpuinfo_x86.h"
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// For C++, add `using namespace cpu_features;`
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static const X86Info info = GetX86Info();
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static const X86Microarchitecture uarch = GetX86Microarchitecture(&info);
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static const bool has_fast_avx = info.features.avx && uarch != INTEL_SNB;
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// use has_fast_avx.
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```
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This feature is currently available only for x86 microarchitectures.
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<a name="usagesample"></a>
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### Running sample code
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Building `cpu_features` (check [quickstart](#quickstart) below) brings a small executable to test the library.
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```shell
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% ./build/list_cpu_features
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arch : x86
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brand : Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz
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family : 6 (0x06)
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model : 45 (0x2D)
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stepping : 7 (0x07)
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uarch : INTEL_SNB
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flags : aes,avx,cx16,smx,sse4_1,sse4_2,ssse3
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```
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```shell
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% ./build/list_cpu_features --json
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{"arch":"x86","brand":" Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz","family":6,"model":45,"stepping":7,"uarch":"INTEL_SNB","flags":["aes","avx","cx16","smx","sse4_1","sse4_2","ssse3"]}
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```
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<a name="support"></a>
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## What's supported
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| | x86³ | AArch64 | ARM | MIPS⁴ | POWER | RISCV | Loongarch | s390x |
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|---------|:----:|:-------:|:-------:|:-------:|:-------:|:-------:|:---------:|:-------:|
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| Linux | yes² | yes¹ | yes¹ | yes¹ | yes¹ | yes¹ | yes¹ | yes¹ |
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| FreeBSD | yes² | not yet | not yet | not yet | not yet | N/A | not yet | not yet |
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| MacOs | yes² | yes⁵ | N/A | N/A | N/A | N/A | N/A | N/A |
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| Windows | yes² | not yet | not yet | N/A | N/A | N/A | N/A | N/A |
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| Android | yes² | yes¹ | yes¹ | yes¹ | N/A | N/A | N/A | N/A |
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| iOS | N/A | not yet | not yet | N/A | N/A | N/A | N/A | N/A |
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1. **Features revealed from Linux.** We gather data from several sources
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depending on availability:
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+ from glibc's
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[getauxval](https://www.gnu.org/software/libc/manual/html_node/Auxiliary-Vector.html)
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+ by parsing `/proc/self/auxv`
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+ by parsing `/proc/cpuinfo`
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2. **Features revealed from CPU.** features are retrieved by using the `cpuid`
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instruction.
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3. **Microarchitecture detection.** On x86 some features are not always
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implemented efficiently in hardware (e.g. AVX on Sandybridge). Exposing the
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microarchitecture allows the client to reject particular microarchitectures.
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|
4. All flavors of Mips are supported, little and big endian as well as 32/64
|
||
|
|
bits.
|
||
|
|
5. **Features revealed from sysctl.** features are retrieved by the `sysctl`
|
||
|
|
instruction.
|
||
|
|
|
||
|
|
<a name="ndk"></a>
|
||
|
|
## Android NDK's drop in replacement
|
||
|
|
|
||
|
|
[cpu_features](https://github.com/google/cpu_features) is now officially
|
||
|
|
supporting Android and offers a drop in replacement of for the NDK's [cpu-features.h](https://android.googlesource.com/platform/ndk/+/main/sources/android/cpufeatures/cpu-features.h)
|
||
|
|
, see [ndk_compat](ndk_compat) folder for details.
|
||
|
|
|
||
|
|
<a name="license"></a>
|
||
|
|
## License
|
||
|
|
|
||
|
|
The cpu_features library is licensed under the terms of the Apache license.
|
||
|
|
See [LICENSE](LICENSE) for more information.
|
||
|
|
|
||
|
|
<a name="cmake"></a>
|
||
|
|
## Build with CMake
|
||
|
|
|
||
|
|
Please check the [CMake build instructions](cmake/README.md).
|
||
|
|
|
||
|
|
<a name="quickstart"></a>
|
||
|
|
### Quickstart
|
||
|
|
|
||
|
|
- Run `list_cpu_features`
|
||
|
|
```sh
|
||
|
|
cmake -S. -Bbuild -DBUILD_TESTING=OFF -DCMAKE_BUILD_TYPE=Release
|
||
|
|
cmake --build build --config Release -j
|
||
|
|
./build/list_cpu_features --json
|
||
|
|
```
|
||
|
|
|
||
|
|
_Note_: Use `--target ALL_BUILD` on the second line for `Visual Studio` and `XCode`.
|
||
|
|
|
||
|
|
- run tests
|
||
|
|
```sh
|
||
|
|
cmake -S. -Bbuild -DBUILD_TESTING=ON -DCMAKE_BUILD_TYPE=Debug
|
||
|
|
cmake --build build --config Debug -j
|
||
|
|
cmake --build build --config Debug --target test
|
||
|
|
```
|
||
|
|
|
||
|
|
_Note_: Use `--target RUN_TESTS` on the last line for `Visual Studio` and `--target RUN_TEST` for `XCode`.
|
||
|
|
|
||
|
|
|
||
|
|
- install `cpu_features`
|
||
|
|
```sh
|
||
|
|
cmake --build build --config Release --target install -v
|
||
|
|
```
|
||
|
|
|
||
|
|
_Note_: Use `--target INSTALL` for `Visual Studio`.
|
||
|
|
|
||
|
|
_Note_: When using `Makefile` or `XCode` generator, you can use
|
||
|
|
[`DESTDIR`](https://www.gnu.org/software/make/manual/html_node/DESTDIR.html)
|
||
|
|
to install on a local repository.<br>
|
||
|
|
e.g.
|
||
|
|
```sh
|
||
|
|
cmake --build build --config Release --target install -v -- DESTDIR=install
|
||
|
|
```
|
||
|
|
|
||
|
|
<a name="bindings"></a>
|
||
|
|
## Community bindings
|
||
|
|
|
||
|
|
Links provided here are not affiliated with Google but are kindly provided by the OSS Community.
|
||
|
|
|
||
|
|
- .Net
|
||
|
|
- https://github.com/toor1245/cpu_features.NET
|
||
|
|
- Python
|
||
|
|
- https://github.com/Narasimha1997/py_cpu
|
||
|
|
- Java
|
||
|
|
- https://github.com/aecsocket/cpu-features-java
|
||
|
|
|
||
|
|
|
||
|
|
_Send PR to showcase your wrapper here_
|