Adding the initial documentation

_pages/docs/simd_targets.md

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+---
+layout: single
+title : "Documentation"
+author_profile: false
+excerpt: "Supported SIMD architectures"
+header:
+  overlay_color: "#5DADE2"
+permalink: /docs/simd_targets/
+sidebar:
+  nav : docs
+---
+{% include base_path %}
+
+The following options can be used for `--enable-simd=` flag to target different SIMD instruction sets:
+
+| `<code>`    | Description                            |
+| ----------- | -------------------------------------- |
+| `GEN`       | generic portable vector code           |
+| `SSE4`      | SSE 4.2 (128 bit)                      |
+| `AVX`       | AVX (256 bit)                          |
+| `AVXFMA`    | AVX (256 bit) + FMA                    |
+| `AVXFMA4`   | AVX (256 bit) + FMA4                   |
+| `AVX2`      | AVX 2 (256 bit)                        |
+| `AVX512`    | AVX 512 bit                            |
+| `QPX`       | QPX (256 bit)                          |
+
+Alternatively, some CPU codenames can be directly used:
+
+| `<code>`    | Description                            |
+| ----------- | -------------------------------------- |
+| `KNC`       | [Intel Xeon Phi codename Knights Corner](http://ark.intel.com/products/codename/57721/Knights-Corner) |
+| `KNL`       | [Intel Xeon Phi codename Knights Landing](http://ark.intel.com/products/codename/48999/Knights-Landing) |
+| `BGQ`       | Blue Gene/Q                            |
+
+#### Notes (November 2016):
+- We are currently supporting AVX512 only for the Intel compiler. GCC and clang will appear in future versions, if the compilers provide sufficient support.
+- For BG/Q only [bgclang](http://trac.alcf.anl.gov/projects/llvm-bgq) is supported. We do not presently plan to support more compilers for this platform.
+- BG/Q performances are currently rather poor. This is being investigated for future versions.
+
+
+{% include paginator.html %}