[all-commits] [llvm/llvm-project] a79db9: [GISel][TableGen] Generate getRegBankFromRegClass ...

[Kai Nacke via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a79db96ec0decca4fe45579e039cf5589345b3ed
      https://github.com/llvm/llvm-project/commit/a79db96ec0decca4fe45579e039cf5589345b3ed
  Author: Kai Nacke <kai.peter.nacke at ibm.com>
  Date:   2024-07-25 (Thu, 25 Jul 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.cpp
    M llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.h
    M llvm/lib/Target/ARM/ARMRegisterBankInfo.cpp
    M llvm/lib/Target/ARM/ARMRegisterBankInfo.h
    M llvm/lib/Target/M68k/GISel/M68kRegisterBankInfo.cpp
    M llvm/lib/Target/M68k/GISel/M68kRegisterBankInfo.h
    M llvm/lib/Target/Mips/MipsRegisterBankInfo.cpp
    M llvm/lib/Target/Mips/MipsRegisterBankInfo.h
    M llvm/lib/Target/PowerPC/GISel/PPCRegisterBankInfo.cpp
    M llvm/lib/Target/PowerPC/GISel/PPCRegisterBankInfo.h
    M llvm/lib/Target/RISCV/GISel/RISCVRegisterBankInfo.cpp
    M llvm/lib/Target/RISCV/GISel/RISCVRegisterBankInfo.h
    M llvm/lib/Target/SPIRV/SPIRVRegisterBankInfo.cpp
    M llvm/lib/Target/X86/GISel/X86RegisterBankInfo.cpp
    M llvm/lib/Target/X86/GISel/X86RegisterBankInfo.h
    A llvm/test/TableGen/RegBankFromRegClass.td
    M llvm/utils/TableGen/RegisterBankEmitter.cpp

  Log Message:
  -----------
  [GISel][TableGen] Generate getRegBankFromRegClass (#99896)

Generating the mapping from a register class to a register bank is
complex:
 - there can be lots of register classes
 - the mapping may be ambiguos
- a register class can span several register banks (e.g. a register
class containing all registers)
- the type information is not enough to decide which register bank to
map to (e.g. a register class containing floating point and vector
registers, and all register can represent a f64 value)

The approach taken here is to encode the register banks in an array
indexed by the ID of the register class. To save space, the entries are
packed into chunks of size 2^n.



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