Callback that assigns a custom location for a calling‐convention value.
Synopsis
Declared in <llvm/CodeGen/CallingConvLower.h>
typedef bool CCCustomFn(unsigned int&, MVT&, MVT&, CCValAssign::LocInfo&, ISD::ArgFlagsTy&, CCState&);
Description
The function may update all arguments to reflect changes and indicates whether it handled the value. It must set isCustom if it handles the arg and returns true.
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