[curves] Distribution-ready optimized code

Tony Arcieri bascule at gmail.com
Fri Apr 3 12:01:21 PDT 2015

On Fri, Apr 3, 2015 at 11:48 AM, Michael Hamburg <mike at shiftleft.org> wrote:

> It may be that if your tool chooses carefully the optimization passes — or
> even avoids most of them entirely — you could get constant-time operation.
> But I don’t know enough about LLVM’s codegen to be sure one way or the
> other.  At least until recently, though, it was absolutely terrible at
> things like add-with-carry intrinsics.  (Not necessarily making them
> variable time, but lowering add; addc to add; setc; zext; add; add.)
> — Mike

I asked the Rust developers to ask the LLVM developers if it's possible to
have LLVM produce guaranteed constant time code. I wasn't privy to the
conversation, but my understanding is the tl;dr: was "no"

Tony Arcieri
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