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Artur, > OK, I just need the same signature for both of those instructions. Both are callinsts of same function, isn't that enough? Since it's a variadic function there is also a bitcast to proper type. So, looking for type of callee (not result, but function type!) you'll obtain the real "signature" of callee and if you'll strip all pointer cast you'll obtain the

Hello Anton > %1 = tail call i32 (i8*, ...)* @printf(i8* noalias getelementptr ([16 x > > i8]* @.str, i32 0, i32 0), i32 %0) nounwind > > %10 = call i32 (i8*, ...)* @printf(i8* noalias getelementptr ([11 x i8]* > > @.str2, i32 0, i32 0), i32 5) nounwind > > > > Instruction::isSameOperationAs() returns false for those two. Is it a > > bug or I misunderstood