johann/cpu_features
1
0
Fork 0
mirror of https://github.com/google/cpu_features.git synced 2025-04-28 07:23:37 +02:00
Code Issues Releases Wiki Activity

Update documentation to reflect per OS support.

Browse Source 
Fixes #16
This commit is contained in:
Guillaume Chatelet 2018-02-13 10:57:49 +01:00
parent 7634420f31
commit bc8df0c1c5
1 changed files with 11 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
README.md
View File

@ -124,23 +124,23 @@ flags : aes, avx, sse4_1, sse4_2, ssse3
<a name="support"></a> <a name="support"></a>
## What's supported ## What's supported
| | x86 | ARM | AArch64 | MIPS | POWER | | | x86³ | ARM | AArch64 | MIPSel | POWER |
|---------------------------- | :-: | :-: | :-----: | :----: | :-----: | |---------|:-------:|:-------:|:-------:|:-------:|:-------:|
|Features revealed from CPU | yes | no* | no* | not yet | not yet | | Android | yes² | yes¹ | yes¹ | yes¹ | not yet |
|Features revealed from Linux | no | yes | yes | yes | not yet | | iOS | not yet | not yet | not yet | not yet | not yet |
|Microarchitecture detection | yes | no | no | no | not yet | | Linux | yes² | yes¹ | yes¹ | yes¹ | not yet |
|Windows support | yes | no | no | no | not yet | | MacOs | yes² | yes¹ | yes¹ | yes¹ | not yet |
| Windows | yes² | not yet | not yet | no | no |
- **Features revealed from CPU.** features are retrieved by using the `cpuid` 1. **Features revealed from Linux.** We gather data from several sources
instruction. *Unfortunately this instruction is privileged for some
architectures, in which case we fall back to Linux.
- **Features revealed from Linux.** We gather data from several sources
depending on availability: depending on availability:
+ from glibc's + from glibc's
[getauxval](https://www.gnu.org/software/libc/manual/html_node/Auxiliary-Vector.html) [getauxval](https://www.gnu.org/software/libc/manual/html_node/Auxiliary-Vector.html)
+ by parsing `/proc/self/auxv` + by parsing `/proc/self/auxv`
+ by parsing `/proc/cpuinfo` + by parsing `/proc/cpuinfo`
- **Microarchitecture detection.** On x86 some features are not always 2. **Features revealed from CPU.** features are retrieved by using the `cpuid`
instruction.
3. **Microarchitecture detection.** On x86 some features are not always
implemented efficiently in hardware (e.g. AVX on Sandybridge). Exposing the implemented efficiently in hardware (e.g. AVX on Sandybridge). Exposing the
microarchitecture allows the client to reject particular microarchitectures. microarchitecture allows the client to reject particular microarchitectures.