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2020 Apr 22
2
_ExtInt, LLVM integers and constant time
Hello everyone,
After reading the nice blog post about _ExtInt, I was wondering whether
operations on i128/i256 and more generally on integer types in LLVM are
guaranteed to be constant time or not.
For instance, for now, the x86 & aarch64 backend generate constant time
code for additions on i256 integers (see https://godbolt.org/z/xMfkqz &
https://go...
2020 Apr 22
3
_ExtInt, LLVM integers and constant time
...m-dev <llvm-dev at lists.llvm.org> wrote:
>
> On Wed, Apr 22, 2020 at 9:35 AM Adrien Guinet via llvm-dev
> <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
>>
>> Hello everyone,
>>
>> After reading the nice blog post about _ExtInt, I was wondering whether
>> operations on i128/i256 and more generally on integer types in LLVM are
>> guaranteed to be constant time or not.
> I don't believe there's any such guarantee even for normal 8/16/32/64
> -bit integers.
Right. I would expect this to be implemen...