[llvm-dev] Loop identification

Krzysztof Parzyszek via llvm-dev llvm-dev at lists.llvm.org
Sat Jan 14 14:57:52 PST 2017

On 1/13/2017 7:08 PM, Hal Finkel wrote:
> This is integer multiplication or floating-point multiplication? If it
> is integer multiplication, I'd expect that using SCEV would be the
> easiest way to recognize the relevant patterns. SCEV is supposed to
> understand all of the unobfuscation tricks.
> Do these instructions contain an implicit loop (of runtime trip count)
> or are you trying to match loops of some fixed trip count?

It's binary polynomial multiplication. The loops are usually with a 
compile-time constant iteration count.

I posted a specific patch with that code:


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