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On 9/12/19 5:06 AM, David Zarzycki via llvm-dev wrote: I think adding a builtin to force CMOV or similar instructions on other architectures is long overdue. It’s generally useful, even if one isn’t mitigating speculative execution. I believe that you can currently get this effect using __builtin_unpredictable in Clang. __builtin_unpredictable wasn't added for this purpose, and it's a

...attdr at google.com> on my team is actually hoping to start working on getting a real data-invariant programming model moving for C++ and part of that will involve adding support to LLVM as well, so I suspect he'd be interested in this topic as well. Not sure what the timelines on any of our lpans are at this point though, so can't really promise much. > > For now, I'd really suggest using the techniques used by BoringSSL and OpenSSL. Sadly, these predominantly rely on assembly. They do have some constructs to use C/C++ code and ensure it remains data-invariant, but it isn'...