Given a machine instruction descriptor, returns the register class constraint for OpNum, or NULL.

Synopsis

Declared in <llvm/CodeGen/TargetInstrInfo.h>

virtual
TargetRegisterClass const*
getRegClass(
    MCInstrDesc const& MCID,
    unsigned int OpNum) const;

Parameters

Name

Description

MCID

Describe properties that are true of each instruction in the target description file. This captures information about side effects, register use and many other things. There is one instance of this struct for each target instruction class, and the MachineInstr class points to this struct directly to describe itself.

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