With success I have built and used an fpc-3.3.1 based LLVM compiler. The FPC LLVM Wiki <https://wiki.freepascal.org/LLVM> says that "the compiler itself on x86-64 is about 10% faster when compiled with LLVM on an Intel Haswell processor, or 18% if you also enable link-time optimization." I could not find how to do that (build the compiler itself with llvm) as it requires starting with an fpc-3.2.2 compiler.
Thanks, Adriaan van Os
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