[llvm-dev] Should ValueTracking::GetUnderlyingObject stop on Alloca instructions rather than calling SimplifyInstruction?

Hal Finkel via llvm-dev llvm-dev at lists.llvm.org
Wed Apr 12 14:46:32 PDT 2017

Yep. Makes sense to me. There's nothing to simplify or constant-fold 
about an alloca.


On 04/12/2017 04:23 PM, Craig Topper wrote:
> Ping
> ~Craig
> On Fri, Apr 7, 2017 at 1:25 PM, Craig Topper <craig.topper at gmail.com 
> <mailto:craig.topper at gmail.com>> wrote:
>     I notice that GetUnderlyingObject has a few checks, but alloca
>     isn't one of them. Then it fall backs to SimplifyInstruction which
>     doesn't know about alloca so falls back to just trying to constant
>     fold it. This seems a little silly since I assume alloca can't be
>     constant folded. Should we just detect this early in
>     GetUnderlyingObject and stop?
>     ~Craig

Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory

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