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crystal: optimize the build command even further #380

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@renich renich commented Mar 23, 2023

It's suggested that you build with: --release --no-debug in order to optimize for performance.

Also, the documentation states the following about --mcpu=:

               --mcpu CPU
                         Specify a specific CPU to generate code for. This will pass a -mcpu flag to LLVM, and is only intended to be used for cross-compilation. For
                         a list of available CPUs, invoke "llvm-as < /dev/null | llc -march=xyz -mcpu=help".  Passing --mcpu native will pass the host CPU name to
                         tune performance for the host.

If we are to use it, then, at the very least, use --mcpu=native.

It's suggested that you build with: `--release --no-debug` in order to optimize for performance. 

Also, the documentation states the following about `--mcpu=`:

```
               --mcpu CPU
                         Specify a specific CPU to generate code for. This will pass a -mcpu flag to LLVM, and is only intended to be used for cross-compilation. For
                         a list of available CPUs, invoke "llvm-as < /dev/null | llc -march=xyz -mcpu=help".  Passing --mcpu native will pass the host CPU name to
                         tune performance for the host.
```

If we are to use it, then, at the very least, use `--mcpu=native`.
@hanabi1224
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Thanks, but it's intended to use --mcpu=broadwell for all launguages

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