Michael Kruse via llvm-dev
2021-Jun-17 21:10 UTC
[llvm-dev] When I got a Operator by iterating a Value's User, how can I got the relevant Instruction?
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
周书林 via llvm-dev
2021-Jun-18 00:24 UTC
[llvm-dev] When I got a Operator by iterating a Value's User, how can I got the relevant Instruction?
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? Sincerely, Shulin 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>