[llvm-dev] value range propagation

John Regehr via llvm-dev llvm-dev at lists.llvm.org
Mon Jul 17 06:45:40 PDT 2017

Hello Anastasiya, please take a look at the analysis implemented in 
LazyValueInfo.cpp, this is LLVM's version of VRP. Also, a lot of this 
kind of work gets done by the analyses in ValueTracking.cpp. Both are in 
the lib/Analysis directory.


On 07/17/2017 03:04 AM, Anastasiya Ruzhanskaya via llvm-dev wrote:
> And also can, if exist, the current version of value range propagation 
> see that for example if I have an operation y = x&60, that the value 
> will nit be more than 6 bits in length?
> 2017-07-17 10:09 GMT+02:00 Anastasiya Ruzhanskaya 
> <anastasiya.ruzhanskaya at frtk.ru <mailto:anastasiya.ruzhanskaya at frtk.ru>>:
>     Hello,
>     I wonder if llvm has pure range propagation pass. Is correlated
>     value propagation that one? It seems that it is not directly deals
>     with ranges. Maybe  there any passes that  simply contain some
>     information about value ranges?
>     Will symbolic value range propagation be done in some time?
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