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llvm/include/llvm/Target/Target.td
| Show First 20 Lines • Show All 180 Lines • ▼ Show 20 Lines | class Register<string n, list<string> altNames = []> { | ||||
| // x86 register AX is covered by its sub-registers AL and AH, but EAX is not | // x86 register AX is covered by its sub-registers AL and AH, but EAX is not | ||||
| // covered by its sub-register AX. | // covered by its sub-register AX. | ||||
| bit CoveredBySubRegs = false; | bit CoveredBySubRegs = false; | ||||
| // HWEncoding - The target specific hardware encoding for this register. | // HWEncoding - The target specific hardware encoding for this register. | ||||
| bits<16> HWEncoding = 0; | bits<16> HWEncoding = 0; | ||||
| bit isArtificial = false; | bit isArtificial = false; | ||||
| // isConstant - This register always holds a constant value (e.g. the zero | |||||
| // register in architectures such as MIPS) | |||||
| bit isConstant = false; | |||||
| } | } | ||||
| // RegisterWithSubRegs - This can be used to define instances of Register which | // RegisterWithSubRegs - This can be used to define instances of Register which | ||||
| // need to specify sub-registers. | // need to specify sub-registers. | ||||
| // List "subregs" specifies which registers are sub-registers to this one. This | // List "subregs" specifies which registers are sub-registers to this one. This | ||||
| // is used to populate the SubRegs and AliasSet fields of TargetRegisterDesc. | // is used to populate the SubRegs and AliasSet fields of TargetRegisterDesc. | ||||
| // This allows the code generator to be careful not to put two values with | // This allows the code generator to be careful not to put two values with | ||||
| // overlapping live ranges into registers which alias. | // overlapping live ranges into registers which alias. | ||||
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