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llvm/lib/Target/RISCV/RISCVRegisterInfo.td
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| // Integer registers | // Integer registers | ||||
| // CostPerUse is set higher for registers that may not be compressible as they | // CostPerUse is set higher for registers that may not be compressible as they | ||||
| // are not part of GPRC, the most restrictive register class used by the | // are not part of GPRC, the most restrictive register class used by the | ||||
| // compressed instruction set. This will influence the greedy register | // compressed instruction set. This will influence the greedy register | ||||
| // allocator to reduce the use of registers that can't be encoded in 16 bit | // allocator to reduce the use of registers that can't be encoded in 16 bit | ||||
| // instructions. | // instructions. | ||||
| let RegAltNameIndices = [ABIRegAltName] in { | let RegAltNameIndices = [ABIRegAltName] in { | ||||
| def X0 : RISCVReg<0, "x0", ["zero"]>, DwarfRegNum<[0]>; | def X0 : RISCVReg<0, "x0", ["zero"]>, DwarfRegNum<[0]> { let isConstant = true; } | ||||
jrtc27: I don't know about other architectures, but RISCV style would be to use let ... in (like… | |||||
| let CostPerUse = [0, 1] in { | let CostPerUse = [0, 1] in { | ||||
| def X1 : RISCVReg<1, "x1", ["ra"]>, DwarfRegNum<[1]>; | def X1 : RISCVReg<1, "x1", ["ra"]>, DwarfRegNum<[1]>; | ||||
| def X2 : RISCVReg<2, "x2", ["sp"]>, DwarfRegNum<[2]>; | def X2 : RISCVReg<2, "x2", ["sp"]>, DwarfRegNum<[2]>; | ||||
| def X3 : RISCVReg<3, "x3", ["gp"]>, DwarfRegNum<[3]>; | def X3 : RISCVReg<3, "x3", ["gp"]>, DwarfRegNum<[3]>; | ||||
| def X4 : RISCVReg<4, "x4", ["tp"]>, DwarfRegNum<[4]>; | def X4 : RISCVReg<4, "x4", ["tp"]>, DwarfRegNum<[4]>; | ||||
| def X5 : RISCVReg<5, "x5", ["t0"]>, DwarfRegNum<[5]>; | def X5 : RISCVReg<5, "x5", ["t0"]>, DwarfRegNum<[5]>; | ||||
| def X6 : RISCVReg<6, "x6", ["t1"]>, DwarfRegNum<[6]>; | def X6 : RISCVReg<6, "x6", ["t1"]>, DwarfRegNum<[6]>; | ||||
| def X7 : RISCVReg<7, "x7", ["t2"]>, DwarfRegNum<[7]>; | def X7 : RISCVReg<7, "x7", ["t2"]>, DwarfRegNum<[7]>; | ||||
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I don't know about other architectures, but RISCV style would be to use let ... in (like CostPerUse below). It'd be good to make sure your change it style-consistent for each backend.