Dear All,
I'm getting the following assertion:
llvm-ld: /home/vadve/criswell/src/llvm22/lib/VMCore/Value.cpp:175: void
llvm::Value::setName(const char*, unsigned int): Assertion `getType()
!Type::VoidTy && "Cannot assign a name to void values!"'
failed.
It seems to be caused by the following line in
lib/Transforms/Scalar/GVN.cpp (line 1566):
PREInstr->setName(CurInst->getName() + ".pre");
The instruction that is being manipulated is:
call fastcc void @_ZNSt10_Select1stISt4pairIKPvS1_EEC1Ev() nounwind
The function (through optimization) doesn't do anything, so the analysis
knows that it does not read from or write to memory:
define internal fastcc void @_ZNSt10_Select1stISt4pairIKPvS1_EEC1Ev()
nounwind readnone {
entry:
ret void
}
A simple fix would be to change the code to only assign a name if the
original instruction has a name. However, would it make more sense to
simply have the code ignore instructions that return void (since if they
don't read or write memory, they must therefore have no effect)?
-- John T.
