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cpu_features: Update hints in README #757

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Mar 2, 2024
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cpu_features: Update hints in README #757

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11 changes: 9 additions & 2 deletions README.md
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Expand Up @@ -48,8 +48,15 @@ $ volk_profile
```

#### Missing submodule
We use [cpu_features](https://github.com/google/cpu_features) as a git submodule to detect CPU features, e.g. AVX.
There are two options to get the required code:
We use [cpu_features](https://github.com/google/cpu_features) to detect CPU features, e.g. AVX.
Some platforms require a very recent version that is not available through the appropriate package manager.
In this case you must use `cpu_features` as a submodule.

**NOTE**: Most package managers provide recent enough `cpu_features` versions by now.
Please default to the provided `cpu_features` version first, and only use the submodule in cases where this fails.
Please open an issue if this is the case.

There are two options to get the required code in a submodule:
```bash
git clone --recursive https://github.com/gnuradio/volk.git
```
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