[llvm-dev] When I got a Operator by iterating a Value's User, how can I got the relevant Instruction?

周书林 via llvm-dev llvm-dev at lists.llvm.org
Thu Jun 17 17:24:41 PDT 2021

Hi Michael,

Thank you very much!
I have a further question: if I want to get the dataflow of a target Value,
is there any way to handle these situations when iterate the Users?Or only
by iterator all the instructions and their operands?


Michael Kruse <llvmdev at meinersbur.de> 于2021年6月18日周五 上午5:11写道:

> Am Do., 17. Juni 2021 um 10:24 Uhr schrieb 周书林 via llvm-dev
> <llvm-dev at lists.llvm.org>:
> > %39 = load i32, i32* getelementptr inbounds (%struct.TTT, %struct.TTT*
> @ttt, i32 0, i32 2), align 8, !dbg !971
> %39 is the LoadInst, while getelementptr is its second operand. It is
> inlined because it is an llvm::Constant, not an instruction. Constants
> do not participate in use/user-chains and hence there is no link from
> GEP to the LoadInst that is using it. The constant GEP object may be
> used by an arbitrary number of other instructions, other constants in
> the same or other functions.
> Node that there "GEPOperator" can represent either a GetElementPtrInst
> (i.e. an instruction) or a GEP constant expression (derived from
> ConstantExpr)
> Michael
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20210618/a384fa36/attachment.html>

More information about the llvm-dev mailing list