Declared in <llvm/CodeGen/GlobalISel/Utils.h>
std::optional<APInt>
getIConstantSplatVal(
Register const Reg,
MachineRegisterInfo const& MRI);
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std::optional<APInt>
getIConstantSplatVal(
MachineInstr const& MI,
MachineRegisterInfo const& MRI);
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Reg if possible.MI if possible.