[libc-commits] [libc] [libc][docs] codify Policy on Assembler Sources (PR #88185)

[Nick Desaulniers via libc-commits]

================
@@ -186,3 +186,32 @@ We expect contributions to be free of warnings from the `minimum supported
 compiler versions`__ (and newer).
 
 .. __: https://libc.llvm.org/compiler_support.html#minimum-supported-versions
+
+Policy on Assembler sources
+===========================
+
+Coding in high level languages such as C++ provides benefits relative to low
+level languages like Assembler, such as:
+
+* Improved safety
+* Instrumentation
+
+  * Code coverage
+  * Profile collection
+* Sanitization
+* Debug info
+
+While its not impossible to have Assembler code that correctly provides all of
+the above, we do not wish to maintain such Assembler sources in llvm-libc.
+
+That said, there a few functions provided by llvm-libc that are more difficult
+to implement or maintain in C++ than Assembler. We do use inline or out-of-line
----------------
nickdesaulniers wrote:

I've reworded this in c06aa9d3d5ee to:

> That said, there a few functions provided by llvm-libc that are impossible
to reliably implement in C++ for all compilers supported for building
llvm-libc.

https://github.com/llvm/llvm-project/pull/88185