[llvm-dev] questions about temporary variables in IntermidateRepresentation(IR)

PeiLIU via llvm-dev llvm-dev at lists.llvm.org
Thu May 12 03:57:17 PDT 2016

Now, I am get the .ll file, some code just like this in the below.

  %call89 = call noalias i8* @malloc(i64 %add88) #5, !dbg !374

  %71 = bitcast i8* %call89 to i32*, !dbg !374

  store i32* %71, i32** %buffer2, align 8, !dbg !374

You can see that the first operand of store is a temporary variables %71.

Q1.  the StoreInst->getOperand(0)->getName().str() return the string

how does it happened, can I get that "71" name.

Q2. I want to get the real operand that is call89 which returned by
function call

malloc. How can I get the original operand call89? I know I can get that
from the

previous instruction bitcast, I can get it from the previous instruction
but it only work

in this circumstance the bitcast instruction, if the previous instruction
is changed, how

I get the variable name in efficiency. Is there a efficiency and elegance
way to get the

origin operand avoid temporary variables like 71(just decimal numbers).

Thanks a lot. Forgive I am a novice llvmer :)
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