[llvm-dev] How to efficiently extract the calledFunction from a complex CallInst?

[Shen Liu via llvm-dev]

Hi all,

Usually if we want to get the called Function we can directly use
CallInst->getCalledFunction(), however, today i encounter an unusual
CallInst as follows:

 %call11 = call double (...)* bitcast (double ()* @quantum_frand to double
(...)*)()

the original C source involve type cast:

float u,v;
extern double quantum_frand();
   u = 2 * quantum_frand() - 1;
   v = 2 * quantum_frand() - 1;

In this case, CallInst->getCalledFunction() returns a nullptr unusually, I
printed out the getOperand(0) and found the operand is the whole thing of
 "double (...)* bitcast (double ()* @quantum_frand to double (...)*)()".
Any member function calling on that fails so i don't know whether there is
an efficient way to exactly get the called function @quantum_frand(...)
here? Thanks!


Best regards,

Shen
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