Of course it was completely ignored. Did you expect the standards committee to enforce caching in compilers? That's just not its job.
> The next major advance to be completely ignored by standards committees will be the 100% memory safe C/C++ compiler, which is also implemented and works amazingly well: https://github.com/pizlonator/fil-c
Again—do you expect the standards committee to enforce usage of this compiler or what? The standards commitee doesn't "standardize" compilers...