Initial import of libdpf.

Co-authored-by: Cursor <cursoragent@cursor.com>

thirdparty/simde/CONTRIBUTING.md

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+# Contributing to SIMDe
+
+First off, if you're even reading this, thank you!  There is a lot of
+work to do, and any help is appreciated.
+
+If you haven't already, please read the
+[README](https://github.com/simd-everywhere/simde/blob/master/README.md).  The
+[wiki](https://github.com/simd-everywhere/simde/wiki) also has some good
+information, especially the
+[FAQ](https://github.com/simd-everywhere/simde/wiki/FAQ) and a guide on how to
+[implement a new
+function](https://github.com/simd-everywhere/simde/wiki/Implementing-a-New-Function).
+
+For information on developing for architectures you don't have access
+to, please see the [Development
+Environment](https://github.com/simd-everywhere/simde/wiki/Development-Environment)
+page on the wiki.
+
+If you still have questions, or if anything below doesn't make sense
+to you, please feel free to use the [issue
+tracker](https://github.com/simd-everywhere/simde/issues) or the [mailing
+list](https://groups.google.com/forum/#!forum/simde) to ask.  I know
+the SIMDe documentation needs a lot of improvement, and asking
+questions will help us understand what is missing, so please don't be
+shy!
+
+## Building the Tests
+
+SIMDe contains an extensive test suite used for development.  Most
+users will never need to build the suite, but if you're contributing
+code to SIMDe you'll need to build them.
+
+Here is the basic procedure for compiling and running the tests:
+
+### On Unix
+```bash
+mkdir -p build
+cd build
+CFLAGS="-march=native" CXXFLAGS="-march=native" meson setup ..
+ninja test
+```
+
+Note that `-march=native` may not be the right flag for your compiler.
+That should work for most compilers on x86/x86_64, though MSVC is an
+exception (try `/arch:AVX2` instead of `-march=native`).  On other
+architectures please consult your compiler documentation to find out
+what flags you should use to enable the SIMD extension for your target
+platform.  Here are a few to try:
+
+ * ARM:
+   * `-march=armv8-a+simd` (for AArch64)
+   * `-march=armv8-a+simd -mfpu=auto` (for ARMv8)
+   * `-march=armv7-a -mfpu=neon` (for ARMv7)
+ * POWER
+   * `-mcpu=native`
+
+If you need a flag not listed above, please let us know so we can add
+it to the list.
+
+### On Windows:
+```bash
+"C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvars64.bat" arm64
+mkdir build
+cd build
+set CFLAGS="/std:c11"
+set CXXFLAGS="/Zc:preprocessor"
+meson setup ..
+ninja test
+```
+Note change arm64 to x64 on x86_64 CPU.
+
+You may also want to take a look at the
+[Docker container](https://github.com/simd-everywhere/simde/tree/master/docker)
+which has many builds pre-configured, including cross-compilers and emulators.
+
+## Coding Style
+
+SIMDe has an [EditorConfig](https://editorconfig.org/) file to
+configure your editor for things like tabs vs. spaces, how many spaces,
+etc. If you use an editor which doesn't support it out of the box then
+odds are good there is a plugin you can download; please do so.
+
+For other coding style information, please see the
+[Coding Style](https://github.com/simd-everywhere/simde/wiki/Coding-Style)
+document in the Wiki.