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Included command to determine default target features #363

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Included command to determine default target features #363

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6 changes: 3 additions & 3 deletions perf-guide/src/target-feature/features.md
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Expand Up @@ -6,8 +6,8 @@ and using a SIMD instruction which is not supported will trigger undefined behav
To allow building safe, portable programs, the Rust compiler will **not**, by default,
generate any sort of vector instructions, unless it can statically determine
they are supported. For example, on AMD64, SSE2 support is architecturally guaranteed.
The `x86_64-apple-darwin` target enables up to SSSE3. The get a defintive list of
which features are enabled by default on various platforms, refer to the target
specifications [in the compiler's source code][targets].
The get a defintive list of which features are enabled by default on various platforms, refer to the target
specifications [in the compiler's source code][targets]. Youc an also determine the default vector instructiosn with
`rustc --print cfg` for the current target or `rustc --print cfg --target={target}` for a different target.

[targets]: https://github.com/rust-lang/rust/tree/master/src/librustc_target/spec
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