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-# Using RUSTFLAGS
-
-One of the easiest ways to benefit from SIMD is to allow the compiler
-to generate code using certain vector instruction extensions.
-
-The environment variable `RUSTFLAGS` can be used to pass options for code
-generation to the Rust compiler. These flags will affect **all** compiled crates.
-
-There are two flags which can be used to enable specific vector extensions:
-
-## target-feature
-
-- Syntax: `-C target-feature=<features>`
-
-- Provides the compiler with a comma-separated set of instruction extensions
-  to enable.
-
-  **Example**: Use `-C target-feature=+sse3,+avx` to enable generating instructions
-  for [Streaming SIMD Extensions 3](https://en.wikipedia.org/wiki/SSE3) and
-  [Advanced Vector Extensions](https://en.wikipedia.org/wiki/Advanced_Vector_Extensions).
-
-- To list target triples for all targets supported by Rust, use:
-
-  ```sh
-  rustc --print target-list
-  ```
-
-- To list all support target features for a certain target triple, use:
-
-  ```sh
-  rustc --target=${TRIPLE} --print target-features
-  ```
-
-- Note that all CPU features are independent, and will have to be enabled individually.
-
-  **Example**: Setting `-C target-feature=+avx2` will _not_ enable `fma`, even though
-  all CPUs which support AVX2 also support FMA. To enable both, one has to use
-  `-C target-feature=+avx2,+fma`
-
-- Some features also depend on other features, which need to be enabled for the
-  target instructions to be generated.
-
-  **Example**: Unless `v7` is specified as the target CPU (see below), to enable
-  NEON on ARM it is necessary to use `-C target-feature=+v7,+neon`.
-
-## target-cpu
-
-- Syntax: `-C target-cpu=<cpu>`
-
-- Sets the identifier of a CPU family / model for which to build and optimize the code.
-
-  **Example**: `RUSTFLAGS='-C target-cpu=cortex-a75'`
-
-- To list all supported target CPUs for a certain target triple, use:
-
-  ```sh
-  rustc --target=${TRIPLE} --print target-cpus
-  ```
-
-  **Example**:
-
-  ```sh
-  rustc --target=i686-pc-windows-msvc --print target-cpus
-  ```
-
-- The compiler will translate this into a list of target features. Therefore,
-  individual feature checks (`#[cfg(target_feature = "...")]`) will still
-  work properly.
-
-- It will cause the code generator to optimize the generated code for that
-  specific CPU model.
-
-- Using `native` as the CPU model will cause Rust to generate and optimize code
-  for the CPU running the compiler. It is useful when building programs which you
-  plan to only use locally. This should never be used when the generated programs
-  are meant to be run on other computers, such as when packaging for distribution
-  or cross-compiling.