Update README.md

README.md

@@ -21,13 +21,16 @@ inline void morton3D_32_decode(const uint_fast32_t morton, uint_fast16_t& x, uin
 inline void morton3D_64_decode(const uint_fast64_t morton, uint_fast32_t& x, uint_fast32_t& y, uint_fast32_t& z);
 </pre>
 
+## Installation
+No installation is required (just download the headers and include them), but I was informed libmorton is packaged for [Microsoft's VCPKG system](https://github.com/Microsoft/vcpkg) as well, if you want a more controlled environment to install C++ packages in.
+
 ## Instruction sets
 In the standard case, libmorton only uses operations that are supported on pretty much any CPU you can throw it at. If you know you're compiling for a specific architecture, you might gain a speed boost in encoding/decoding operations by enabling implementations for a specific instruction set. Libmorton ships with support for:
- * **BMI2 instruction set**: Intel Haswell CPU's and newer. Define `__BMI2__` before including `morton.h`. This is definitely a faster method when compared to the standard case.
+ * **BMI2 instruction set**: Intel: Haswell CPU's and newer. AMD: Ryzen CPU's and newer. Define `__BMI2__` before including `morton.h`. This is definitely a faster method when compared to the standard case.
  * **AVX512 instruction set (experimental)**: Intel Ice Lake CPU's and newer. Uses `_mm512_bitshuffle_epi64_mask`. Define `__AVX512BITALG__` before including `morton.h`. For more info on performance, see [this PR](https://github.com/Forceflow/libmorton/pull/40).
-
-## Installation
-No installation is required (just download the headers and include them), but I was informed libmorton is packaged for [Microsoft's VCPKG system](https://github.com/Microsoft/vcpkg) as well, if you want a more controlled environment to install C++ packages in.
+ 
+When using MSVC, these options can be found under _Project Properties -> Code Generation -> Enable Enhanced Instruction set_.
+When using GCC (version 9.0 or higher), you can use `-march=haswell` (or `-march=znver2`) for BMI2 support and `-march=icelake-client` for AVX512 support.
 
 ## Testing
 The `test` folder contains tools I use to test correctness and performance of the libmorton implementation. You can regard them as unit tests. This section is under heavy re-writing, but might contain some useful code for advanced usage.